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WIRELESS DATA AND WIRELESS DATA AND VOICE COMMUNICATION VOICE COMMUNICATION
THROUGH THROUGH INFRA-RED INFRA-RED LEDLED..
ELEMENTS:ELEMENTS:
• MIKE: Its converts sound signals into electrical signals.MIKE: Its converts sound signals into electrical signals.• AMPLIFIER (A): Signals from mike are amplified so that AMPLIFIER (A): Signals from mike are amplified so that
it can drive to infrared-LED.it can drive to infrared-LED.• INFRARED-LED: It carries signals.INFRARED-LED: It carries signals.• PHOTO TRANSISTOR: The electrical signals are regained PHOTO TRANSISTOR: The electrical signals are regained
from the optical signals.from the optical signals.• AMPLIFIER (B): Energy of signals is amplified to drive AMPLIFIER (B): Energy of signals is amplified to drive
the speaker.the speaker.• SPEAKER: Electrical signals which are amplified are SPEAKER: Electrical signals which are amplified are
reconverted into sound signals at the speaker.reconverted into sound signals at the speaker.• DTMF CODER: It is generates the DTMF signal DTMF CODER: It is generates the DTMF signal
corresponding to the number entered from the corresponding to the number entered from the keyboard.keyboard.
• DTMF DECODER : It is fed to DTMF decoder which gives DTMF DECODER : It is fed to DTMF decoder which gives the binary output corresponding to the signal received the binary output corresponding to the signal received from the transmitter.from the transmitter.
• DECODER DRIVER : To drive the 7 segment display.DECODER DRIVER : To drive the 7 segment display.
TRANSMISSION SECTION INFRA RED LED RECIEVER SECTION
BLOCK DIAGRAMBLOCK DIAGRAM
MICROPHONE OP-AMP(INVERTED MODE)
push-pull amplifier(transistor BC.548/558)
DTMF CODER(UM912158)
IR LEDPHOTO
TRANSISTOR DTMF DECODER
(CM8870)DECODER(74LS47)
7 SEGMENTDISPLAY
SPEAKER
KEYPAD
CIRCUIT DIAGRAM OF CIRCUIT DIAGRAM OF TRANSMITTER TRANSMITTER (VOICE)(VOICE)
CIRCUIT DIAGRAM OF CIRCUIT DIAGRAM OF RECEIVER (VOICE) RECEIVER (VOICE)
CIRCUIT DIAGRAM OF
TRANSMITTER
CIRCUIT DIAGRAM OF RECEIVER
COMPONENTS USED:COMPONENTS USED:COMPONENTS USED:COMPONENTS USED:
RESISTANCE:RESISTANCE:R1 150WR1 150WR2,R11,R12 100kWR2,R11,R12 100kWR3, R7 10KWR3, R7 10KWR4, R8 4.7kWR4, R8 4.7kWR5,R6,R9,R10 15KWR5,R6,R9,R10 15KWR13 220K WR13 220K WR14 1KWR14 1KWR15-R22 150WR15-R22 150WVR-1,VR-2 1MW Variable ResistanceVR-1,VR-2 1MW Variable Resistance
• CAPACITOR:CAPACITOR:C1,C2,C4,C5 0.1 mfd (104 pf)C1,C2,C4,C5 0.1 mfd (104 pf)C3 220 mfdC3 220 mfdMIKE Condenser MicrophoneMIKE Condenser Microphone
• SEMICONDUCTOR:SEMICONDUCTOR:IC1- UM91215B (DTMF CODER)IC1- UM91215B (DTMF CODER)IC2, IC-3 741 (OP AMP)IC2, IC-3 741 (OP AMP)IC-4 CM8870 (DTMF DECODER)IC-4 CM8870 (DTMF DECODER)IC-5 74LS47 (DECODER)IC-5 74LS47 (DECODER)T1,T3 NPN BC548T1,T3 NPN BC548T2,T4 PNP BC558T2,T4 PNP BC558LED Light Emitting DiodeLED Light Emitting DiodePt. Photo TransistorPt. Photo Transistor
MISCELLANEOUS:MISCELLANEOUS:
IC Base 8 Pin (2pcs.)IC Base 8 Pin (2pcs.)ZENER DIODE 3.2Volt ZENER DIODE 3.2Volt
Speaker 8 ohmsSpeaker 8 ohmsOptical Fiber General purposeOptical Fiber General purposePCB General purposePCB General purposeSlide Switch DPDTSlide Switch DPDTBattery 6 volt DCBattery 6 volt DC
CONDENSER MICROPHONE:CONDENSER MICROPHONE:
AMPLIFIER AMPLIFIER OP AMP IC 741 OP AMP IC 741
TRANSISTOR NPN BC548TRANSISTOR NPN BC548
PNP TRANSISTOR (BC 558)PNP TRANSISTOR (BC 558)
INFRA RED LEDINFRA RED LED
SPEAKER (8 ohm)SPEAKER (8 ohm)
UM91214B DTMF ENCODER
DTMF DECODER(CM8870)DTMF DECODER(CM8870)
74LS4774LS47 (DECODER) (DECODER)
7 SEGMENT DISPLAY
SLIDE SWITCH DPDTSLIDE SWITCH DPDT
HARDWARE SNAPSHOTHARDWARE SNAPSHOT
THANK YOUTHANK YOU
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