16mA WHEN BUZZING

SAMPLE

PULSE WIDTH = 40uS

PULSE RATE = 20 PPS

D

S

G

D

RVDD

VSS

CLK

SQ

414

6

3

7 5

1

4013B

AVERAGE CURRENT = 10uA

ON DOORKNOB

WIRE LOOP

11

D

4013B

S

CLK

9

DOORKNOB TOUCH ALARM

DRAWN BY: DAVE JOHNSON

+

AVERAGE CURRENT = 10uAAPPROX. 3 YEARS OPERATION

3V

TWO AA CELLS

ADJUST SO ALARM TURNS ONWHEN KNOB IS TOUCHED

CHASSIS GND

METAL PLATE ON BOX

NOTE! WILL NOT WORK ON METAL DOORS

12

D

G

S

+

Q_

8

R

10

DOORALM2.DSN A

DAVID JOHNSON AND ASSOCIATES

DOORKNOB ALARM

A

1 1Monday, May 29, 2000

Size Document Number Rev

Date: Sheet of

Q1ZVNL110A

+3V +3V

50uS

50mS

R3

2.2M

R2

12K

R1

4.7M

C2

0.0047

C3

0.022uF

C4

15pF

R4200K

SENSITIVITYADJ

C6470pF

C5

12pF

R6

470K

R5

330K

R7

10K

+C1

47uF

+3V

BUZZERSTAR MMB-01

+3V

Q1ZVNL110A