Heathkit GC 1107 Schematic

Page 1

SCHEMATIC or THE
HEATHKIT®

DIGITAL ALARM CLOCK
MODEL (EC-1107

NOTES:
1. RESISTOR VALUES ARE IN OHMS IK=1000, M =1,000,000I.

2. ALL RESISTORS ARE 1/4 WATT, 5% TOLERANCE UNLESS
OTHERWISE NOTED.

3. ALL CAPACITOR VALUES ARE IN uF (MICROFARADSI.
4. V THIS SYMBOL INDICATES A CIRCUIT BOARD GROUND.

5. E] THIS SYMBOLINDICATESACIRCUIT BOARD WIRE
CONNECTION.

6. ._*£__THIS SYMBOL INDICATES A CONNECTION USED IN THE
IZ-HOUR MODE OF OPERATION.

7. .*:kl__THIS SYMBOL INDICATES A CONNECTION USED IN THE
24»HOUR MODE OF OPERATION,

8. 0 THIS SYMBOL INDICATES A DC VOLTAGE MEASURED
WITH A HIGH INPUT IMPEDANCE VOLTMEIER FROM
THE POINT INDICATED TO CIRCUIT BOARD GROUND.
VOLTAGES MAY VARY t10%. VOLTAGES IN THE DIMMING
CIRCUIT 0F TRANSISTOR 01 DEPEND ON THE AMOUNT
OF LIGHT DETECTED BY LDRI. *ALARM OFF.

9. DIODES D4 AND D5 ARE USED ONLY IN THE 24-HOUR MODE
OF OPERATION.

Copyrlght © 1977

Heath Company

All Rights Reserved

Primed in the United State: of America Part of 595404903

120:
50/:
Hz

240 VAC
50/60
Hz

CIRCUIT BOARD I

1-1

TI

23VAC

Istc

:D:

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