214

8

11

10

9

12

3

16

R

VSS

VDD

POWER CORD

+

D

S

G

+

OUT

IN

SENSOR

PLATES

FIELD

74H

C4060

T Y P ICAL STAND-BY CURRENT DRAIN = 4uA

213

212

210

29

2

115

13

UNDER

60Hz SIGNAL AMP60Hz HALF WAVE RECTIFIER UNPLUGED ALARM ONE-SHOT

APPROX. 4 SEC

BEEP RATE

BEEP TONEAPPROX 5Hz

APPROX 1KHz

APPROX 1Hz

5% DUTY CYCLE

100mS BEEP TIME

D

S

G

D R AWN BY: DAVE JOHNSON

LOW BATTERY OSC

8mA AVERAGE CURRENT DURING ALARM

NOTE:

A2

UNPLUGGED POWER CORD ALARM

WIRED FOR 8 MIN TIMEOUT

APPROX. 1Hz

V+

GNDOUT

GND V+ OUT

PANASONIC MN13812-G2.4V TRIP POINT

A3 LOW BATTERY

ALL DIODES = 1N4148

A

DAV ID JOHNSON AND ASSOCIATES

U N P LUGGED POWER CORD ALARM

C

0 0Saturday, July 08, 2000

CORDALM1.DSN

TIMEOUT

TIMER RESET

UNPLUGGED ALARM

UNPLUGGED ALARM

TIMEOUT

2 HRS+ C1

10uF

C30.1

+

C41.5uF

C50.1

C6

0.1

C7

0.1

C80.01

D1

D2

D3

D4

D5

D6

D7

D8

D9

A1B

4069UB

3 4A1C

4069UB

5 6

A1E

4069UB

11 10

A1D

4069UB

9 8

A1F

4069UB

13 12

Q3ZVNL110

Q4

ZVNL110

R3

4.7M

R54.7M

R71M R82.2M

R9

1M

R1022M

R111M

R13270

SP1

40 OHM SPEAKER

S1A

POWER SWITCH

R24.7M

D10REPLACE BATTERY

TIMEOUT

8 MIN

R12120K

R4

4.7M

+3V +3V

+3V

+3V

+3V

+3V

2 N CELLS

+3V

TOP VIEW

+3V

+3V

A1A

4069UB

1 2

R1

22M

A4C

74HC132

9

108

A4A

74HC132

1

23

A4D

74HC132

12

1311

A4B

74HC132

4

56