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Ultrasound Technologies Ltd

PD1 & Fetatrack 120 series DopplersService manual

PD1 & FT120 service manual Issue 3 Jan 2007

©Ultrasound Technologies Ltd, Lodge Way, Portskewett, Caldicot, South Wales NP26 5PS, United Kingdom. T +44 (0) 1291 425425 F: +44 (0) 1291 427093 E: [email protected] W: www.doppler.co.uk


Products covered by this service manual

PD1 series pocket dopplers

Product Group

Product version Product variation

PD1 audio pocket doppler

Babypulse home use doppler

Fetatrack 120 audio doppler

PD1+ fetal dopplerwith FHR display

PD1v vascular doppler

Fetatrack 120+ fetal doppler with FHR

PD1dwr waterbirth doppler

PD1cv low cost vascular doppler

PD1v flat probe vascular doppler

PD1combi fetal / vascular doppler

Vascutrack 120 vascular doppler

PD1 service manual Issue 2 January 2005



CONTENTS 1. 0General Introduction

1.1. 1 4Introduction 1.2. 1 5Re Order Information 1.3. 1 6Symbols 1.4. 1 7CE Marking 1.5. 1 8Guidelines for identifying and resolving adverse EMC conditions 1.6. 1 9Specification

2. 1Description of the Instrument 2.1. 2 0Audio Unit. 2.2. 2 1Audio Unit 2.3. 2 2Audio Unit 2.4. 2 3Dismantling Instructions 2.5. 2 4Audio Unit 2.6. 2 5Transducers

3. 2Circuit Description 3.1. 2 6Introduction 3.2. 2 7Audio Unit Power Supply 3.3. 2 8Battery Low Indicator 3.4. 2 9Ultrasound Transducer 3.5. 3 0Oscillator and Detector 3.6. 3 1Receiver and Detector 3.7. 3 2Audio Amplifier 3.8. 3 3Velocity Processor

4. 3Test and Calibration 4.1. 3 4Introduction 4.2. 3 5Performance Checks 4.3. 3 6Test Procedure 4.4. 3 7Audio Unit 4.5. 3 8Transducer 4.6. 3 9Velocity Processor 4.7. 4 0Transducer Calibration

5. 4Fault Finding 5.1. 4 1Fault Finding Guidelines

6. 5Parts Lists 6.1. 4 2Audio Unit PCB Assembly 6.2. 4 3Audio Unit with heart rate PCB Assembly 6.3. 4 42MHz Transducer assembly 6.4. 4 5General Assembly 6.5. 4 6+ units General Assembly

7. 6Drawings and Circuit Diagrams

PD1 service manual Issue 2 January 2005



©Ultrasound Technologies Ltd Page 1 of 32 PD1 service manual Issue 2 January 2005

1. 7General Introduction

1.1. 4 7Introduction

This service manual is written to support the maintenance and repair of the PD1 Series Doppler detectors.

Servicing of this equipment should be performed by a qualified technician, after carefully studying this manual.

The drawings and circuit descriptions in this manual are correct as of the date it was prepared, however, however the Company reserves the right to make changes to improve the operation of the instrument. If your instrument does not exactly match the information in this manual, contact the manufacturer or distributor for revision information.

Inspect the instrument upon receipt, in the unlikely event that the unit has been damaged, notify your distributor or Ultrasound Technologies directly at the following address: -

Ultrasound Technologies Ltd.,

Lodge Way, Portskewett

4 8 Caldicot, NP26 5PS

South Wales , UK

Telephone: +44 (0) 1291 425425

FAX: +44 (0) 1291 427093

4 9 E-mail: [email protected]

Retain the packing material for possible future use.

Important Note:

In the unlikely event that the instrument must be returned to Ultrasound Technologies for service or for any other reason, use the same packing material in which the instrument was delivered.

If this is not available, the instrument should be packed in such a way that will provide adequate packing. The Company will not accept any responsibility for loss or damage due to improper use of packing material.

Ultrasound Technologies Ltd1.1 5 0Re - Order Information

Listed below are the consumables used with the PD1 Series Pocket Dopplers: -

Description

Ultrasound Coupling Gel 0.25ltr.

5 1 MN1604 series Alkaline Battery

1.2 5 2Symbols

The following symbols have been used on the PD1 and are here defined according to IEC60601

IEC Symbol 878-02-02

Type B Equipment.

IEC Symbol 348

8 6Attention Consult accompanying documents

Headset Output

Volume Control

Serial DATA Out

Rear View of doppler Showing additional symbols



1.3 5 3CE Mark

This product complies with the essential requirements of the European Council Directive 93/42/EEC relating to Medical Devices.

0120

1.4 5 4Guidelines for identifying and resolving adverse EMC conditions

This product is classified as a Class A Group 1 type of product according to EN55011.

Emissions

Care has been taken through the design and manufacturing process to minimise the EM emissions, which may be produced by this equipment. However, in the unlikely event that the unit causes an EM disturbance to adjacent equipment, we suggest that the procedure is carried out ‘out of range’ of the affected equipment.

Immunity

If the user has any doubt regarding the units EM immunity during routine operation, we suggest that the source of EM disturbance is identified and it’s emissions reduced. If there is any doubt regarding the identification and resolution of adverse EM conditions, contact Ultrasound Technologies Ltd directly who will advise on the situation. The address can be found in the front of this manual.



1.5 Series specifications Ultrasound

Frequency (PD1+ / PD1dwr / fetatrack 120+) 2 MHz continuous wave fixed probe (PD1v / PD1cv / Vascutrack 120) 5 or 8 MHz continuous wave fixed probe (PD1 combi /PD1+ combi / Combitrack) 2, 3, 5 or 8MHz interchangeable probe

Transducer 2 crystal narrow beam. Output power <5mW/cm² SATA (2, 3 MHz fetal probe) <15mW/cm² SATA (5 and 8MHz vascular probe) Audio response 300Hz – 1KHz (fetal) 300Hz – 4KHz (vascular) Audio output 500mW Fetal heart rate (PD1+ / PD1+ combi / PD1dwr / fetatrack 120+) Multipoint real time autocorrelator Fetal Heart Range 50 to 210 bpm

Unit Controls Keys 1 Key (for unit on/off on audio unit – all models) 1 Key (for unit on/off on probe – fetatrack 120 and vascutrack 120 models) Controls Rotary volume Indicators (PD1 / PD1/ combi / PD1v / fetatrack 120 / vascutrack 120) Yellow battery low LED Indicators (PD1+ / PD1+ combi / PD1dwr / fetatrack 120+) 3 digit FHR LCD display / FHR pulse

icon / Battery Low icon Power Supply

Battery MN1604 (PP3) 9V Alkaline Manganese Expected battery life (PD1 / PD1v / fetatrack 120 / vascutrack 120) >9 hours Expected battery life (PD1+ / PD1dwr / fetatrack 120+) >8 hours

Outputs Headset Audio output to optional headset Serial (PD1+ / PD1dwr / fetatrack 120+) RS232 interface to optional UltraTrace software Recorder (PD1v [not PD1v CAT] / vascutrack 120) Voltage output proportional to velocity of

flow

Enclosure Material ABS Size 150mm by 75mm Weight 295g typically including transducer

Safety Classification Class 1 Type B - IEC 60601-1



2. 8Description of the Instrument

2.1. 5 5Audio Unit PD1 (Fetatrack 120, Babypulse)

The following functions are found in the relevant page of the operating instructions.

UNIT ON/OFF On / Off control.

BATTERY LOW LED indicator to show when the battery has reached a point when it requires changing.

VOLUME CONTROL Rotary edge potentiometer, which increases or decreases the setting of the volume.

HEADSET Audio output for connection to a stereo headset for private listening.

PD1 / Babypulse fetal transducer

Fetatrack 120 fetal transducer



2.2. 5 6Audio Unit PD1+ (PD1dwr / fetatrack 120+ / babypulse +)





RS 232 Interface Serial data output, for connection to the optional ULTRATRACE 2 PC software. Connections are made via the 3.5mm Stereo jack socket.

FHR DISPLAY Custom LCD module displays FHR rate, FH pulse and Battery condition.

PD1+ / Babypulse+ / PD1dwr fetal transducer Fetatrack 120 + fetal

transducer



2.3. 5 7Audio Unit PD1v



BATTERY LOW LED indicator to show when the battery has reached a point when it requires changing.





2.4. 5 8Dismantling Instructions Special Note: -The instrument must not be dismantled when in use on a patient, ensure all accessories are disconnected. 2.5. 5 9Audio Unit The Audio unit houses the main circuit board. To remove the circuit board, turn the unit onto it's front and remove the three M4 countersunk screws. The rear panel will now come away revealing the PCB.

Remove the two M3 screws securing the PCB.



The transducers, loudspeaker and battery connections are ‘hard wired’ to the PCB. De-solder the connections at J4 (retractile cable) and J3 (loudspeaker), the PCB can then be pulled clear of the case.



6 02.6 Transducers The transducers are a ‘sealed unit’. However, it is possible to gain access to the 2 MHz assembly by removing the two blanking grommets and M3 countersink screws. Removing the screws will allow the assembly to be split along its length. Gently prise the assembly apart.

The circuit board is bonded and keyed to the faceplate assembly using a high strength cyno-acrylic adhesive.

Circuit board removal is carried out by carefully breaking the bond and de-soldering the crystal wires and retractile cable connections (see diagram below).



3.0 Circuit Description 3.1 6 1Introduction

The circuit has been divided into functional blocks with each block being described separately, the blocks are as follows:

• Audio Unit Power Supply

• Battery Low Indicator

• Ultrasound Transducer

• Oscillator and Detector

• Oscillator and Transmitter Amplifier

• Receiver and Detector

• Audio Amplifier

• Controls and Indicators

• Unit ON / OFF

• Battery Low

3.2 6 2Audio Unit Power Supply

The unit operates from a single 9-Volt dry battery. It is recommended that only alkaline cells be used. The audio circuit is fed directly from the battery. D1 provides circuit protection from battery reversal.

The unit is turned on by the membrane switch, which is mounted on the front of the unit. Closing the switch, grounds the CLK input of U1 pin 3, the output on pin 2 switches on Q2 allowing current to flow into the various circuits.

The unit will remain switched on for approximately 5 minutes (set by C4 and R5) after which it turns off automatically, unless the user forces the unit off by de-pressing the ON/OFF switch.

3.3 6 3Battery Low Indicator U3 is a voltage detector, when the voltage on pin 1 drops below the threshold set by R10 and R11 (7.3V), the output state changes forcing the LED (D2) to illuminate.

3.4 6 4Ultrasound Transducer The ultrasound transducer operates on the pulse wave Doppler principle. There are a number of transducer frequencies suitable for different applications, however the basic operating principles are identical.

Each transducer consists of a pair of piezo ceramic crystals, each crystal pair is arranged as a transmitter and receiver, the ultrasonic output beam is focussed through a lens or faceplate.



With the exception of the 2MHz Fetal transducer, the electronics are housed in the main audio unit.

The oscillator and detector are built up of four discrete sections. These are the master oscillator, transmitter amplifier, receiver amplifier and detector.

These operate to produce a pulse wave ultrasound signal that is passed to the transmitting crystal in the transducer.

The signal is then reflected from moving interfaces within the body to the receiver crystal in the transducer, amplified and then detected so the audio Doppler shift of that moving interface can be heard audibly and / or converted into a velocity signal.

3.5 6 5Oscillator and Transmitter Amplifier Field effect transistor Q2, with L1, C16, C17 and associated components form a Colpitts oscillator. This oscillator runs at a nominal frequency of 2, 5 or 8MHz producing a pulse wave of amplitude of approximately 5V Pk.

The signal is then fed to output transistor Q3 that drives the transmitter crystal in the transducer. The output power is set by VR1. The signal is fed to the transducer via a tuned transformer L2 (C23), the output impedance of which is set correctly to match the transducer crystal impedance. The output drive signal is nominally 1.5V Pk.

3.6 6 6Receiver and Detector The reflected Doppler signal is fed via a resonant transformer L4 (C25) to the gate of Q5, the drain of this FET connects to the source of Q4 to form a cascode amplifier the drain of which contains the resonant circuit L3,(C21).

From the drain of Q4 the amplitude complex of the received signal is detected by passing the signal through diode D2 with the high frequency signals being filtered by R12 and C15.

The raw low frequency complex is then amplified and filtered by U1 where its associated components form a band pass filter amplifier with a bandwidth of 150Hz to 1KHz for the obstetrics or 300Hz to 4KHz in the vascular transducer.

This signal is passed to the audio unit via the retractile cable. 3.7 6 7Audio Amplifier

The audio signal is routed via the retractile cable to J4 pin 4 on the audio circuit board. The signal passes through the potentiometer VR1 to the audio amplifier U2, where it is amplified and output to the loudspeaker connected to J3.

3.8 6 8Velocity Processor (PD1V Model Only) The audio signal is fed from the band pass amplifier (U5) through the threshold control VR3 to the V to F converter (U3).

The conversion factor is 0.5V/ KHz with fine adjustment provided by VR2.

The output of this circuit is then scaled by R4, 6 to a suitable voltage level for most ECG machines and recorders.



4.0 9Test and Calibration

4.1 6 9Introduction

The following sections detail tests to ensure that the unit is operating within specification. These tests may be performed in whole or part, however, if any repairs are carried out to the power supply circuits then it is recommended that the whole test / calibration procedure is undertaken.

4.2 7 0Performance Checks The following procedure is intended to provide a means of determining the functional status of the unit. It should be included as part of a preventative maintenance plan and should be performed on a regular basis at least once a year.

Ensure that a full capacity alkaline cell is fitted.

Switch the unit ON and increase the volume to maximum. The battery low indicator will flash ON momentarily and then extinguish.

Place the transducer with ultrasound gel on the palm of the hand over the radial artery, a clear pulse will be heard.

Check the unit for signs of damage, particularly the transducer cable near the point of entry to the unit and transducer body.

4.3 7 1Equipment Oscilloscope 2 channel 50 MHz bandwidth minimum resolution 5mV/cm

DC Power Supply 0 – 30VDC @1A

Digital Multimeter 4 Digit measuring 1mV, 1mA, 0.1ohm

Frequency Counter 0 - 10MHz resolution at 2MHz 1KHz.

Signal Generator 10Hz to 10MHz 1mV to 10V Sinewave

4.4 7 2Audio Unit

Set the power supply to 9VDC output and connect to battery fling leads.

Switch ON the power supply. Switch the board under test ON by shorting pins 1 and 2 of connector J1. Check the battery low LED flashes momentarily. Check the current being drawn by the board under test is less than 50ma.

Using the DVM, measure the DC voltage at the Drain of Q2 (junction of C8 & C11) this will be between 8.80 and 8.60 V DC.

Carefully decrease the power supply output, check and record the voltage reading at which point the Battery low LED illuminates permanently. This will be between 7.0 and 7.5 V DC



Using a pair of tweezers, Introduce noise into pin 4 of J4. Rotate the volume control through its complete range of travel and observe the audio output from the speaker increases and decreases accordingly.

4.5 7 3Transducer

8 7Transmitter

Set the DC Power Supply to 9Vdc, solder the +ve lead to pin 1 of J1 and the –ve lead to J1 pin 2 on the board under test.

Switch ON the power supply, check the current being drawn by the board under test is less than 50ma. Using the DVM, measure the DC voltage at the junction of C8 and R7, this will be between 5.2 and 5.8V DC. Using the oscilloscope connected to the pad TxSig, adjust L1 so that the signal is set to 2.000MHz.

Adjust L2 to set the output to 1.5V pk/pk.

8 8Receiver

Connect the oscilloscope to the junction of D2 and R12, adjust both L4 and L3 to maximise the DC signal.

Move the oscilloscope to J1 pin 4, carefully stroke the transducer faceplate and observe a low frequency signal is displayed on the oscilloscope. The measured output will be a DC voltage of greater than 5.5V.

4.6 7 4Velocity Processor

With the oscilloscope set to AC input, adjust the output signal from audio generator to a frequency of 1kHz and an amplitude of 15mV + 1mV pk-pk. Connect this signal to the junction of C22 and U5 pin 1.

Set frequency to 10KHz and attach oscilloscope to pin 7 IC3, adjust VR3 until the signal just changes state from 0V to 5V. The signal will be rough DC.

Using a multimeter, place the +ve probe to the junction of R18, R19 and C19, adjust VR4 until the until the DC level measures 5V.



5.0 1 0Fault finding guidelines This section is an aid to trouble shooting and should be used in conjunction with the relevant circuit diagrams found at the rear of this manual. In each case the re calibration must be carried out after any repair.

The following tables list some of the symptoms and the relevant circuit areas.

NOTE Do not, under any circumstances attempt to repair the instrument whilst it is connected to a patient.

Symptom Suspect Circuit Check Unit does not switch ON Remote switch on front panel J1 pin 1 goes low when

switch is depressed

U1 ON/OFF Control Output goes low when switch is depressed

Battery J1 pin 1 > 7V Battery Low LED on permanently

Battery condition J1 pin 1 > 7V Replace battery

U3 Comparator See test / calibration section Excessive battery drain U1 / Q2 ON/OFF Control Q2 must switch when switch

is depressed. Change battery

Ultrasound OK but no audio Transducer position Re position transducer Crackling operation of volume

control VR1 Replace volume control

Broken conductor in cable Check audio signal on pin 3 of U2

Headphone socket SK2 Audio signal on J3 pin 1 Replace loudspeaker

Unit unstable Ultrasound transducer Check output drive into crystal is 1.5V pk/pk. Check received signal in transducer J1 pin 4, signal should be a low frequency audio signal approx. 2Vpk/pk. Replace transducer.



6.0 1 1Parts list The following section contains parts lists for the following items: -

• PD1+ Audio PCB assembly

• PD1 Audio PCB assembly

• PD1 2MHz Probe assembly

• PD1 Final assembly

• PD1+ Final assembly

6.1 7 5PD1+ Audio PCB Assembly

Device Value Device Type Circuit Reference Quantity

Capacitor 470uF Electrolytic Axial 10V Panasonic SU ECEB1AU471

C10 1

Capacitor 100uF Min Electrolytic 16V 5mm

Nippon Chemi-con SRA / Samsung SSM

C2,9,11,12,13,18,19,21,27,28,29,30,32,33,34,35,37

17

Capacitor 10uF tant 20V case size A AVX / Kemet case size A C5,15,16 3

Capacitor 0u47F tant 25V case size A AVX / Kemet case size A C7 1

Capacitor 0805 100nF Mono Ceramic 0805 series Z5U dielectric C1,6,8,14,17 5

Capacitor 0805 47nF Mono Ceramic 0805 series X7R dielectric C26 1

Capacitor 0805 10nF Mono Ceramic 0805 series X7R dielectric C4,36 2

Capacitor 0805 1nF Mono Ceramic 0805 series COG dielectric C20,31 2

Capacitor 0805 22pF Mono Ceramic 0805 series COG dielectric C23,24 2

Capacitor 1206 1uF Z5U Ceramic 1206 series Z5U dielectric C3,22,25 3

IC Analogue CD4013D Philips/ Harris/National U2 1

IC Analogue ZM33064Z Zetex U4 1

IC Analogue LM386M-1 National U3 1

IC Analogue LM324M National U7 1

IC PSU ICL7660CBA Maxim U1 1

IC PSU ZR78L05G Zetex U11 1

IC Digital CD74HC4066D Philips/ Harris/National U9 1

IC Digital MAX1243BESA Maxim U6 1

IC Digital MAX202ECSA Maxim U10 1

IC Digital TSC87251G1-A16CB Temec U8 1



IC Digital ICM7211AMIM44 Harris U5 1

Diode 10BQ040 IR D1 1

Diode BAS16 D2,5 2

Crystal 12MHz 86SMX X1 1

Transistor RFD8P05SM Harris Q1 1

Resistors 1% 0805 10R Samsung/Phillips/ROHM R5,6 2

Resistors 1% 0805 100R Samsung/Phillips/ROHM R3 1

Resistors 1% 0805 2K2 Samsung/Phillips/ROHM R7 1


Resistors 1% 0805 10K Samsung/Phillips/ROHM R9,13,15,16,18,19,20,21,22,23,24,25,26,28,29

15

Resistors 1% 0805 22K Samsung/Phillips/ROHM R17 1


Resistors 1% 0805 68K Samsung/Phillips/ROHM R11,14 2

Resistors 1% 0805 100K Samsung/Phillips/ROHM R10,27,31 3


Resistors 1% 0805 1M Samsung/Phillips/ROHM R1,2,4 3

LCD module PD1D107 1

Volume Control 10K Log Tsubuya 161P-N2, A10K VR1 1

Volume Control Knob Tsubuya 1KF-4B Black Knob VR1 knob 1

Connector Jack socket Hosiden HSJ 1501-010010 P1,2 2

Connector PP3 battery connector 1

Connector Molex 3 way ZIF Molex 39-51-4032 J2 1

PCB PD1 plus audio board PD1D109 1



6.2 7 6PD1 Audio PCB Assembly

Device 1 2Value Device Type Circuit Reference Quantity

Capacitor 470uF Electrolytic Axial 10V Panasonic SU ECEB1AU471

C7 1



C1,8,9,11,12 5

Capacitor 10uF tant 20V AVX / Kemet case size A C13,14 2

Capacitor 0u47F tant 25V AVX / Kemet case size A C4,5 2

Capacitor 1206 100nF Mono Ceramic 1206 series Z5U dielectric C6,8,9,10,15 5

Capacitor 1206 10nF Mono Ceramic 1206 series X7R dielectric C3 1

Capacitor 1206 1uF Z5U Ceramic 1206 series Z5U dielectric C2 1

IC Analogue CD4013D Philips/ Harris/National U1 1

IC Analogue ZM33064Z Zetex U3 1

IC Analogue LM386M-1 National U2 1

Diodes 10BQ040 IR D1 1

Diode LED Yellow Temic TLLY4401 D2 1

Transistor RFD8P05SM Harris Q2 1

Transistor BSS138 Fairchild Semiconductor Q1 1




Resistors 1% 1206 4K7 Samsung/Phillips/ROHM R11,12 2


Resistors 1% 1206 1M Samsung/Phillips/ROHM R3,5,6,7 4

Resistors 1% 1206 3M3 Samsung/Phillips/ROHM R1 1

Volume Control 10K Log Tsubaya 161P-N2, A10K VR1 1

Volume Control Knob Tsubuya 1KF-4B Black Knob

VR1 knob 1

Connector Jack socket Hosiden HSJ 1501-010010 P1,2 2

Connector PP3 battery connector 1

Connector Molex 3 way ZIF Molex 39-51-3032 J2 1

PCB PD1D103 PD1 Audio PCB 1



6.3 7 7PD1 2MHz Transducer Assembly

Description 8 5Value Device Type Circuit Reference Quantity



C5,8,12 3

Capacitor 1u0F tant 35V case size A C4,11 2

Capacitor 100nF Mono Ceramic 0805 series Z5U dielectric C1,2,3,7,10,26,22,24 8

Capacitor 10nF Mono Ceramic 0805 series X7R dielectric C18 1

Capacitor 22nF Mono Ceramic 0805 series X7R dielectric C6,13 2

Capacitor 1n0F COG Ceramic 0805 series COG dielectric C9,15,23 3

Capacitor 220pF COG Ceramic 0805 series COG dielectric C19,20,25 3

Capacitor 330pF COG Ceramic 0805 series COG dielectric C17 1



IC Analogue TL072CD SGS / TI U1 1

Diodes BZX84C6V2 D1 1

Diodes BAT54 D2 1

Transistor MMBF4416LT1 Motorola Q2,4,5 3

Transistor BC848B Q1,3 2

Inductor Toco 0838 L4 1





Resistors 1% 0805 22R Samsung/Phillips/ROHM R7 1

Resistors 1% 0805 100R Samsung/Phillips/ROHM VR1 1

Resistors 1% 0805 1K Samsung/Phillips/ROHM R3,8 2


Resistors 1% 0805 2K2 Samsung/Phillips/ROHM R1,2,11 3


Resistors 1% 0805 100K Samsung/Phillips/ROHM R4,5,6,9,10,12,18,19 8

PCB PD1D110 PD1 probe board 1

Piezo Ceramic Crystal 2MHz Resonant Frequency 2



Faceplate PD1D102 1

Probe Cover PD1D101 2

M3 x16 Pozi C'sk screw 1

M3 Full nut 1

Cover plug 2



6.4 7 8PD1 Audio Unit General Assembly

Description Part Number Quantity

Case Front PD1D105 1

Case Rear PD1D106 1

Battery Slide PD1D104 1

Loudspeaker 1

Retractile cable PD1D100 1

Label front PD1D108 1

Label rear PD1D108 1

Front Membrane PD1D108 1

M3 x 6 Pozi Pan screw 2

M3 Internal shakeproof washer 2


Fibre flat washer 2

Cable tie 1

PVC Foam based adhesive strip 0.1

Serial number label 1



6.5 7 9PD1+ General Assembly

Description Part Number Quantity

Case Front PD1D105 1

Case Rear PD1D106 1

Battery Slide PD1D104 1

Loudspeaker 1

Retractile cable PD1D100 1

Label front PD1+ PD1D108 1

Label rear PD1D108 1

Front Membrane PD1+ PD1D108 1


M3 Internal shakeproof washer 2


Fibre flat washer 2

Cable tie 1

PVC Foam based adhesive strip 0.1

Serial number label 1



7.0 13Circuit Diagrams & Engineering Drawings The following section contains circuit diagrams and Engineering Drawings: -



• PD1 Audio PCB Layout



8 0PD1+ Audio PCB Layout




Ultrasound Technologies Ltd8 1PD1 Probe PCB Layout


Ultrasound Technologies Ltd8 2PD1 General Assembly


Ultrasound Technologies Ltd8 3PD1+ GA


Ultrasound Technologies Ltd8 42MHz Transducer Assembly


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R15

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R10

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R18

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R4

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R12

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R9

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R6100K

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L1 0841

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C22

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C2100nF

C26

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C24

100n

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C10

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C3

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F

C7

100n

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R14

27K

C19

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C25

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C20

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C15 1nF

C91nF

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C1310nF

C610nF

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18/0

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ultra

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1999

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C13

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C4

10nF

D1

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0

21

C3

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J4

1 2 3 4

C6

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FC

110

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Jun

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99

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put

12

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12

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56

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A B C D

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TB

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12C

ON

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1X

A

4X

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8X

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ultra

tec

1999

Cop

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Dat

eE

CN

Issu

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6/11

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UT

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1 10 11 12 13141516171819

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20212223242526

3 4 5 6 7 8 9

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7211

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17639 2835

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10b3

18b4

44B

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3c2

11c3

19c4

31C

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38d1

4d2

12d3

20d4

24D

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25D

B1

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B2

27D

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41e1

5e2

13e3

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43f1

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15f3

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MA

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43

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3S

HD

N

2A

IN6

DO

UT

5G

ND

4R

EF

1V

DD

7C

S

8S

CLK

R1722K

R1247K

R11 68K

R1468K

C2647nFR23

330K

R30330K

LM32

4M

U7

3I+

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1

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7

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8

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4 11

14

C20 1nF

C311nF

C24

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X1 12

MH

z

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100K

R27100K

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BA

S16

D5

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S16

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23

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R1810K

R9

10K

R29

10K

R28

10K

R26

10K

R25

10K

R24

10K

R22

10K

R21

10K

R19

10K

R15

10K

R13

10K

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AT8

9C51

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21X

1

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35E

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P02

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P13

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147

P15

8P

169

P17

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2025

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2227

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28P

2429

P25

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2631

P27

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16T0

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D

14IN

T015

INT1

19R

D18

WR

33A

LEP

32P

SE

N

+C

3210

uF

C36

10nF

C25

1uF

C22

1uF

C38100nF

C21100nF

C19

100n

F

C18

100n

F

C29

100n

FC

3010

0nF

C35

100n

FC

3710

0nF

C27

100n

F

C28

100n

F

C34

100n

F

C33

100n

F

Vcc

Vcc

Vcc

Dis

p1[1

:7]

Vcc

Dis

p2[1

:7]

Vcc

Dis

play

AD1

Dis

play

AD2

Dis

p2[1

]

Dis

play

CS

Dis

p2[2

]D

isp1

[7]

4fbp

Dis

p2[3

]D

isp1

[6]

Dis

p1[2

]D

isp1

[3]

Dis

p2[4

]D

isp1

[5]

Dis

p1[1

]D

isp1

[4]

Vcc

Vcc

Dis

p2[5

]D

isp1

[7]

Dis

p1[5

]

Dis

p1[6

]D

isp2

[3]

Dis

p2[6

]D

isp1

[4]

Dis

p2[2

]D

isp2

[4]

Dis

p2[7

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isp1

[3]

Dis

p2[1

]D

isp2

[5]

DB

[0]

Dis

p3[1

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Vcc

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p2[7

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[6]

DB

[1]

Dis

p3[2

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isp1

[1]

Dis

p3[2

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isp3

[3]

DB

[2]

Dis

p3[3

]D

isp3

[1]

Dis

p3[4

]D

B[3

]D

isp3

[4]

Dis

p3[7

]D

isp3

[5]

Agc

1D

isp3

[5]

4gD

isp3

[6]

Agc

2D

isp3

[6]

Dis

play

CS

Vcc

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3D

isp3

[7]

Dis

play

AD2

Agc

4D

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ayAD

1R

S23

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RS

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n {0

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A/D

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[0]

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Off

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1}

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[0:3

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Vcc

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A/D

CS

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Off

A/D

Dat

eIn

Audi

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{01}

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1

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2

Agc

3

Agc

4

182

June

00

4

RS

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Nov

99

178

317

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FHR

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o =

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Prec

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June

98

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Dig

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12

34

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12

34

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78

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R39

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SK

2

132 4

J5

1 2 3 4 5V

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10K

R1

3M3

L3 0850

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C46

33pF

C38

47pF

C42

100p

F

C37

100p

F

R622K

R4

22K

C40

22pF

VR

220

K

VR

320

K

+C

610

0uF

R11

470R

R18

68K

R968K

C20

68nF

C5

68nF

LM29

07

U3

2C

harg

e3

Ib4

Is

1Tc

o

6V

cc5

Vcc

o

8gn

d7

op

MMBF4416Q4

1D

3G

2S

MMBF4416Q7

1D

3G

2SMMBF4416

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1D

3G

2S

D2

BZX

84C

6V2

23

D4

BZX

84C

6V2

23

L4 0838

1 3

4 6

BAT54D5

23

TL07

2

U5

5I+

6I-

8 4

7

TL07

2

U5

3I+

2I-

8 4

1

C30470pF

C36

470p

F

R33

1K5

R31100R

R28

100K

R36

100K

R22

100K

R30

100K

R27

100K

R23

100K

R24100K

R37

100K

L1 0841

1 2 3

BC

848B

Q3

2B

3C

1E

BC848BQ5

2B

3C

1E

L2 0876

1 2 3

4 6

R2522R

R32

27K

C41

220p

F

C19

1nF

R19100K

R5100K

BS

S13

8Q

1

3D

2G

1S

ZM33

064Z

U4

1IN

3O

UT

YE

L_3M

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D3

2 1

C2

1uF

+C

110

0uF

D1

10B

Q04

0

21

C10

470u

F

ultra

tec

1999

Cop

yrig

htD

rg N

o:

Dat

eE

CN

Issu

e

Dra

wn:

Ultr

asou

nd T

echn

olog

ies

Ltd

Gw

ent.

NP6

6BZ

. UK

Itton

, Che

psto

wFo

rest

ers

Hou

seD

ate:

ofSh

eet

Nam

e:P

D1V

AS

~110

/19/

001

13:

24:0

4 P

M

J41 2

J21 2

J11 2

LM38

6M

U2

7

18

2M

3P6 4

5

+C

1610

uF

+C

1710

uF

R34

10R

R1210R

R13

10R

R35

10R

Q2

RFD

8P05

SM

2D

1 G

3S

U1

CD

4013

3C

LK5

D4

RE

SE

T

6S

ET

2Q

1Q

U1

CD

4013

11C

LK9

D10

RE

SE

T

8S

ET

12Q

13Q

R174K7

R16

4K7

+C

40u

47F

+C

70u

47F

R15

2K2

R20

2K2

R29

2K2

R14

1K0

R2

1K0

R21

1K0

R26

1K0

+C11100uF

+C

1510

0uF

+C

1410

0uF

+C

3310

0uF

+C

2610

0uF

+C

2910

0uF

C18

100n

F

C13

100n

F

C22

100n

F

C21

100n

F

C8

100n

F

C9

100n

F

C43

100n

F

C47

100n

F

C45

100n

F

C31

100n

F

C24

100n

F

C28

100n

F

R7

1M

R10

1M

R8

1M

R3

1M

C3410nF

C2710nF

C12

10nF

C3

10nF

C3910nF

Vcc

SW

Vrf

Vcc

TxSi

g

Vcc

SW

Vcc

TxSi

gV

rf

RxS

ig

RxS

ig

Vcc

SW

Nov

99

L4 =

083

9

L3 =

087

4

C44

,46

= 22

pF

C42

= 2

20pF

C40

,41

= 47

pF

C37

,38

= 22

pF8M

Hz

Com

pone

ntFr

eque

ncy

Com

pone

ntFr

eque

ncy

C46

= 4

7pF

C44

= 1

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C40

= 1

00pF

C38

= 1

00pF

4MH

z

PD1

Vasc

ular

(5M

Hz)

Loud

spea

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Volu

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Con

trol

Dat

a O

utpu

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ket

Wav

efor

m

0.5V

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Filte

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Rec

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Tran

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frequ

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Batte

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1

NA

S

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ry L

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Uni

t On

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cont

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12

34

56

78

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34

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78

A B C D

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3D

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TP6

TP5

TP4

TP3

TP2

TP1

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180K

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4 6

L4 0839

1 3

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3247

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R3810K

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132 4

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J5

1 2 3 4 5V

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R39

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R622K

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VR

320

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R11

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100K

R37

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100K

R22

100K

R27

100K

R23

100K

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L1 0841

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2E

BC848BQ5

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2E

L2 0876

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C19

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R19100K

R5100K

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100n

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C18

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C13

100n

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C22

100n

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C21

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C8

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C9

100n

F

C43

100n

F

C45

100n

F

C31

100n

F

C24

100n

F

C28

100n

F

R7

1M

R10

1M

R8

1M

R3

1M

C35

10nF

C2

10nF

C3410nF

C2710nF

C12

10nF

C3910nF

Vcc

SW

Vrf

Vcc

TxSi

g

Vcc

SW

Vcc

Vrf

TxSi

g

RxS

ig

RxS

ig

Vcc

SW

Dec

05

4A

ug 0

221

03

100-

0026

-00Jan

0219

02

PD1

Vasc

ular

(8M

Hz)

Nov

99

Loud

spea

ker

Volu

me

Con

trol

Dat

a O

utpu

t Soc

ket

Wav

efor

m

0.5V

/KH

z

Filte

ring

Rec

eive

r

Tran

smitt

er

frequ

ency

to v

olta

ge c

onve

rter

Batte

ry In

put

1

NA

S

Batte

ry L

ow

Uni

t On

/ Off

cont

rol

12

34

56

78

12

34

56

78

A B C D

A B C D

R20

180K

C11

1uF

C4

1uF

C16

680p

F

C17

330p

F

MM

BF4

416

Q6

1 D

3G

2 S

MMBF4416Q2

1D

3G

2S

MMBF4416Q5

1D

3G

2SMMBF4416

Q4

1D

3G

2S

D1

BZX8

4C6V

2

13

Sou

th W

ales

. NP

26 5

PS

. UK

Por

tske

wet

t, C

aldi

cot

Lodg

e W

ay

ultra

tec

2003

Cop

yrig

htD

rg N

o:

Dat

eE

CN

Issu

e

Dra

wn:

Ultr

asou

nd T

echn

olog

ies

Ltd

Dat

e:of

She

etN

ame:

FETA

LTD

R_R

51

1

L3 0842

1 3

L4 0838

1 3

4 6

J1

1 2 3 4

TL07

2

U1

3I+

2I-

8 4

1

TL07

2

U1

5I+

6I-

8 4

7

C21

470p

F

R16

10RR17

10R

R12K2

R2

2K2

R11

2K2

R15

1K5

R3

1K0

R8

1K0

R13100R

R12

100K

R10

100K

R18

100K

R4

100K

R9

100K

R5

100K

R6100K

R19

100K

L10841

123

BC

848B

Q1

1B

3C

2E

BC848BQ3

1B

3C

2E

L2 0876

1 2 3

4 6

+C

1210

0uF

+C

510

0uF

+C

810

0uF

R722R

C1

100n

F

C22

100n

F

C2100nF

C26

100n

F

C24

100n

F

C10

100n

F

C3

100n

F

C7

100n

F

R14

27K

C19

220p

F

C25

220p

F

C20

220p

F

C15 1nF

C91nF

C23

1nF

C14

10nF

C1310nF

C610nF

C1810nF

Vrf

TxSi

g

Vrf

RxS

ig

12/0

55

18/0

5/20

00PD

1D11

0-AS

SY18/0

5/00

181

418

/01/

9915

83

(VR

1)

15/0

5/98

21M

arch

98

nas

- utl

Pock

et D

oppl

er F

etal

Tra

nsdu

cer 2

MH

z

Tran

sduc

er C

onne

ctor

12

34

56

78

12

34

56

78

A B C D

A B C D

J21 2

R20

180K

C11

1uF

C4

1uF

C16

680p

F

C17

330p

F

MM

BF4

416

Q6

1 D

3G

2 S

MMBF4416Q2

1D

3G

2S

MMBF4416Q5

1D

3G

2SMMBF4416

Q4

1D

3G

2S

Sou

th W

ales

. NP

26 5

PS

. UK

Por

tske

wet

t, C

aldi

cot

Lodg

e W

ay

ultra

tec

2003

Cop

yrig

htD

rg N

o:

Dat

eE

CN

Issu

e

Dra

wn:

Ultr

asou

nd T

echn

olog

ies

Ltd

Dat

e:of

She

etN

ame:

FETA

LSE

WA

RD

_R4

11

L3 0842

1 3

L4 0838

1 3

4 6

J1

1 2 3 4

TL07

2

U1

3I+

2I-

8 4

1

TL07

2

U1

5I+

6I-

8 4

7

C21

470p

F

R16

10RR17

10R

R12K2

R11

2K2

R15

1K5

R3

1K0

R8

1K0

R13100R

R12

100K

R10

100K

R18

100K

R4

100K

R9

100K

R5

100K

R6100K

R19

100K

L10841

123

BC848BQ3

1B

3C

2E

L2 0876

1 2 3

4 6

+C

1210

0uF

+C

810

0uF

R722R

C1

100n

F

C22

100n

F

C2100nF

C26

100n

F

C24

100n

F

C10

100n

FC

710

0nF

R14

27K

C19

220p

F

C25

220p

F

C20

220p

F

C15 1nF

C91nF

C23

1nF

C14

10nF

C1310nF

C610nF

C1810nF

Vrf

TxSi

g

Vrf

RxS

ig

Pro

be S

witc

h

Tran

sduc

er C

onne

ctor

412

/05

Feta

track

120

Tra

nsdu

cer 2

MH

z

nas

- utl

12

34

56

78

12

34

56

78

A B C D

A B C D

R8

12K

TP1

D2

BZX

84C

6V2

13

BC

848B

Q2

1B

3C

2E

J4

1 2 3 4 5 6

R547R

J2

1 2 3

SK

1

132 4

+C

61u

0F

Sou

th W

ales

. NP

26 5

PS

. UK

Ports

kew

ett,

Cal

dico

tLo

dge

Way

ultra

tec

2003

Cop

yrig

htD

rg N

o:

Dat

eE

CN

Issu

e

Dra

wn:

Ultr

asou

nd T

echn

olog

ies

Ltd

Dat

e:of

She

etN

ame:

PD

1PLU

S2

12

R7

22K

R2

100R

U1

SI7

661

2C

AP

+

4C

AP

-

3G

ND

8V

1+5

VO

-

C8

470u

F

VR

110

0K

J11 2

J31 2

LM38

6M

U3

7

18

2M

3P6 4

5

+C

410

uF

+C

1410

uF

+C

1510

uF

R6

10R

Q1

RFD

8P05

SM 2D

1 G

3S

U2

CD

4013

11C

LK9

D10

RES

ET

8SE

T

12Q

13Q

U2

CD

4013

3C

LK5

D4

RES

ET

6SE

T

2Q

1Q

R10

2K2

+C

1810

0uF

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2110

0uF

+C

1110

0uF

+C

1010

0uF

+C

210

0uF

+C9100uF

R4

1M

R3

1M

R1

1M

R9

4K7

C3

10nF

C13

10nF

D1

10B

Q04

0

21

C17

100n

F

C20

100n

F

C19

100n

F

C7

100n

F

C5

100n

FC

110

0nF

C12

100n

F

C16

100n

F

VS

ewar

dpro

be

Bat

tery

Con

ditio

n {0

2}

prob

e_sw

itch

Uni

tShu

tDow

n {0

2}

Aud

ioC

ompl

ex {0

2}

prob

e_sw

itch

VS

ewar

dpro

be

Vol

ume

Con

trol

Con

nect

orPo

wer

Tran

sduc

er

Uni

t On

/ Off

cont

rol

Batte

ry In

put

Jan

056

PD1

Plus

s2

Aud

io C

ircui

t

Aug

02

210

5

100-

0002

-00

182

Jun

004

Loud

spea

ker

Nov

99

317

817

6S

ept 9

92

June

98

1

12

34

56

78

12

34

56

78

A B C D

A B C D

D4

BZX

84C

2V7

13

R24

15K

TP4

TP5

TP2

TP3

X1 11

.059

20M

Hz

J61234567

V61

08

U4

2 3 4 12C

LK

7D

0

11D

I

13FR

5R

1S

1

44S

1043

S11

42S

1241

S13

40S

1439

S15

38S

1637

S17

36S

1835

S19

52S

2

34S

2033

S21

32S

2231

S23

30S

2429

S25

28S

2627

S27

26S

28

25S

29

51S

3

24S

30

23S

31

22S

32

21S

33

20S

34

19S

35

18S

36

17S

37

16S

38

15S

39

50S

4

14S

40

49S

548

S6

47S

746

S8

45S

9

6S

TR

9V

DD

8Vl

cd

10V

SS

1

VM

X10

20

U6

58A

DC

I3

49A

GN

D1

63A

GN

D2

21D

GN

D

54IS

RC

IN

53IS

RC

OU

T

2O

PIN

+

1O

PIN

-

64O

PO

UT

3P

OT1

A4

PO

T1B

55P

OT2

A56

PO

T2B

10R

X1D

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RX

1D-

9TX

1D+

7TX

1D-

30V

DD

140

VD

D2

57V

DD

A

44V

PP

46V

TRIM

52R

ES

ET

59A

DC

I2

19C

CU

2

50IN

T0

47N

C

36O

SC

035

OS

C1

38P

31-R

X0

39P

32-T

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41P

33-C

CU

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35-T

1IN

45P

36-S

DA

48P

37-S

CL

5S

W1A

62X

TVR

EF

61A

DC

I060

AD

CI1

20IN

T1

14P

00-T

2IN

13P

01-T

2EX

12P

02-T

X1

11P

03-R

X1

15P

10-P

WM

016

P11

-PW

M1

17P

12-P

WM

218

P13

-PW

M3

31P

1432

P15

33P

1634

P17

22P

20-C

S3-

23P

21-C

S2-

24P

22-C

S1-

25P

23-C

S0-

26P

24-S

S-

27P

25-S

CK

28P

26-S

DO

29P

27-S

DI

37P

30-T

X0

51P

M

6S

W1B

SK

2

132 4

Sout

h W

ales

. NP2

6 5P

S. U

KPo

rtske

wet

t, C

aldi

cot

Lodg

e W

ay

ultra

tec

2003

Cop

yrig

htD

rg N

o:

Dat

eE

CN

Issu

e

Dra

wn:

Ultr

asou

nd T

echn

olog

ies

Ltd

Dat

e:of

Shee

tN

ame:

PD

1PLU

S2

22

MA

X20

2E

U7

8R

2in

9R

2out

10T2

in7

T2ou

t

2V

+

6V

-

1C

1+

3C

1-

4C

2+

5C

2-

13R

1in

12R

1out

11T1

in14

T1ou

t

ZR78

L05G

U8

3IN

1O

UT

J5

1 10 11 12 13141516171819

2

20212223242526

3 4 5 6 7 8 9

R1622K

R1447K

R12

68K

R1568K

C3047nFR22

330K

R26330K

LM32

4M

U5

3I+

2I-

4 11

1

LM32

4M

U5

5I+

6I-

4 11

7

LM32

4M

U5

10I+

9I-

4 11

8

LM32

4M

U5

12I+

13I-

4 11

14

C22 1nF

C341nF

C28

22pF

C27

22pF

R11

100K

R25100K

R27100K

BA

S16

D3

1 3

R23 10K

R21

10K

R20

10K

R19

10K

R13

10K

R1810K

R1710K

+C

2510

uF

+C

4010

uF

C35

10nF

C31 1uF

C26

1uF

C43

100n

F

C44

100n

F

C23

100n

F

C39

100n

F

C32

100n

F

C33

100n

F

C37

100n

F

C36

100n

F

C38

100n

FC

4110

0nF

C42

100n

F

C29100nF

C24100nF

Vcc

Vcc

Dis

p1[1

:7]

Dis

p2[1

:7]

bpD

isp1

[1]

Dis

p1[2

]

Dis

p1[3

]D

ispS

ym1

feta

l_si

gnal

_com

plex

Vcc

Vcc

Vcc

Dis

p1[4

]Ba

ttery

Con

ditio

n {0

1}R

Dis

p1[5

]R

S23

2_R

x

STR

Dis

p1[6

]D

isp1

[2]

bpR

S23

2_Tx

Vcc

Dis

p1[7

]D

isp1

[1]

Dis

p1[3

]D

isp2

[1]

FRD

isp1

[6]

Dis

p1[4

]D

isp2

[2]

RD

isp1

[7]

Dis

p1[5

]D

isp2

[3]

STR

Dis

p2[2

]D

isp2

[3]

SD

OD

isp2

[4]

Dis

p2[1

]D

isp2

[4]

Uni

tShu

tDow

n {0

1}S

CLK

Dis

p2[5

]D

isp2

[6]

Dis

p2[5

]

FRD

isp2

[6]

Dis

p3[2

]D

isp2

[7]

Dis

p2[7

]D

isp3

[1]

Dis

p3[3

]D

isp3

[1]

Dis

p3[6

]D

isp3

[4]

Dis

p3[2

]D

ispS

ym2

Dis

p3[5

]S

CLK

Dis

p3[3

]D

isp3

[7]

SD

OD

isp3

[4]

FHR

_Agc

Dis

p3[5

]

Dis

p3[6

]

Dis

p3[1

:7]

Dis

p3[7

]

Dis

pSym

1

Dis

pSym

2

Vcc

SD

A

SC

L

Res

et

Vcc

Vcc

SC

L

SD

A Res

et

Audi

oCom

plex

{01}

FHR

_Agc

feta

l_si

gnal

_com

plex

Low

Pas

s fil

ter f

o =

220H

z

Dev

ice

Prog

ram

min

g In

terfa

ce

Proc

esso

r Dig

ital P

ot is

30K

11 M

Hz

Clo

ck

6Ja

n 05

Aug

02

210

5

PD1

Plus

s2

Dig

ital S

igna

l Pro

cess

or

RS

232

Feta

l Com

plex

Low

Pass

Filt

er (5

Hz)

Prec

isio

n R

ectif

ier

182

June

00

4N

ov 9

917

83

176

Sept

99

2Ju

ne 9

81

LCD

Inte

rface

12

34

56

78

12

34

56

78

A B C D

A B C D

J2

1 2 3

C232n2F

+C

3247

0nF

+C

2547

0nF

R2410K

R3810K

SK

1

132 4

SK

2

132 4

J5

1 2 3 4 5V

R1

10K

R1

3M3

R39

22K

R622K

R4

22K

VR

320

K

VR

220

K

+C

610

0uF

R11

470R

R18

68K

R968K

C20

68nF

C5

68nF

LM29

07

U3

2C

harg

e3

Ib4

Is

1Tc

o

6V

cc5

Vcc

o

8gn

d7

op

D2

BZX

84C

6V2

23

D4

BZX

84C

6V2

23

TL07

2

U5

5I+

6I-

8 4

7

TL07

2

U5

3I+

2I-

8 4

1R

2810

0K

R22

100K

R27

100K

R23

100K

BC

848B

Q3

2B

3C

1E

C19

1nF

R19100K

R5100K

BS

S13

8Q

1

3D

2G

1S

ZM33

064Z

U4

1IN

3O

UT

YE

L_3M

M

D3

2 1

+C

110

0uF

D1

10B

Q04

0

21

C10

470u

F

Sout

h W

ales

. NP2

6 5P

S. U

KPo

rtske

wet

t, C

aldi

cot

Lodg

e W

ay

ultra

tec

2003

Cop

yrig

htD

rg N

o:

Dat

eE

CN

Issu

e

Dra

wn:

Ultr

asou

nd T

echn

olog

ies

Ltd

Dat

e:of

Shee

tN

ame:

FETA

TR~1

11

J41 2

J11 2

LM38

6M

U2

7

18

2M

3P6 4

5

+C

1610

uF

+C

1710

uF

R1210R

R13

10R

Q2

RFD

8P05

SM 2D

1 G

3S

U1

CD

4013

3C

LK5

D4

RE

SE

T

6S

ET

2Q

1Q

U1

CD

4013

11C

LK9

D10

RE

SE

T

8S

ET

12Q

13Q

R174K7

R16

4K7

+C

40u

47F

+C

70u

47F

R15

2K2

R20

2K2

R29

1K0

R21

1K0

R26

1K0

R14

1K0

R2

1K0

+C11100uF

+C

1510

0uF

+C

1410

0uF

+C

2610

0uF

+C

2910

0uF

C35100nF

C22100nF

C21100nF

CC

1810

0nF

C13

100n

F

C8

100n

F

C9

100n

F

C24

100n

F

C28

100n

F

R7

1M

R10

1M

R8

1M

R3

1M

C2

10nF

C3410nF

C2710nF

C12

10nF

Vcc

SW

Vcc

prob

e_po

wer

Vcc

SW

Vcc

prob

e_po

wer

prob

e_au

dio

prob

e_au

dio

Vcc

SW

prob

e_au

dio

Vcc

SW

prob

e_au

dio

Feta

track

120

ser

ies

audi

o un

it ci

rcui

ts

June

03

frequ

ency

to v

olta

ge c

onve

rter

Wav

efor

m /

tape

reco

rdin

g ou

tput

auto

off

timer

head

set

Filte

ring

Loud

spea

ker

Volu

me

Con

trol

Dat

a O

utpu

t Soc

ket

0.5V

/KH

z

Batte

ry In

put

1

NA

S

Batte

ry L

ow

Uni

t On

/ Off

cont

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Documents

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