Unplugged Power Cord Alarm

T Y P I C A L STAND-BY CURRENT DRAIN = 4uA 8 m A A V E R AGE CURRENT DURING ALARM

+3V

+

16 VDD

TIMER RESET

0.1

S1A POWER SWITCH

12 C5

4.7M

9

R

74HC4060

2 N CELLS

OUT

10

R4 +3V

11 4.7M R5

+ C1 10uF +3V

+3V

IN

2

13

9

10 2

15

12 2

1

13 2

2

14 2

3

TIMEOUT 8 MIN

TIMEOUT 2 HRS

VSS D3

APPROX. 1Hz

8

APPROX. 4 SEC

A2

R1

FIELD

4.7M R2

22M

SENSOR

A1A

PLATES

1

4.7M

C3 0.1

2

R3

A1B 3

D2 WIRED FOR 8 MIN TIMEOUT

A1C

4

5

6

+

D1

4069UB

1.5uF C4

4069UB 6 0 Hz HALF WAVE RECTIFIER

60Hz SIGNAL AMP

UNPLUGGED ALARM

4069UB UNPLUGED ALARM ONE-SHOT

POWER CORD +3V +3V

+3V

+

D4 1

UNPLUGGED ALARM

A4A

R9 3

2 TIMEOUT

A4B

A1D 9

8

12

4069UB

2.2M

D6 0.1 C6

11

D8

R8

4

120K

BEEP RATE

D 6

5

G

R12

0.01 C8

APPROX 5Hz

ZVNL110 Q3

S 74HC132

74HC132

D5 1M R7

A4D 13

D7

74HC132

40 OHM SPEAKER SP1

1M

+3V BEEP TONE

APPROX 1KHz +3V

A3

270 R13

A1E

V+ OUT GND

11

10

R E PLACE BATTERY D10

LOW BATTERY

4069UB

A4C

A1F

10 UNDER

8

9

13

12

G

ZVNL110 S

74HC132 GND V+ OUT

D

Q4

4069UB

R10 D9 22M

NOTE:

ALL DIODES = 1N4148

TOP VIEW PANASONIC MN13812-G 2.4V TRIP POINT

1M 0.1 C7

R11

LOW BATTERY OSC APPROX 1Hz 5% DUTY CYCLE 100mS BEEP TIME

D R AWN BY: DAVE JOHNSON

UNPLUGGED POWER CORD ALARM

D A V I D JOHNSON AND ASSOCIATES U N P LUGGED POWER CORD ALARM C

CORDALM1.DSN Saturday, July 08, 2000

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