Heathkit HD 1418 Schematic 2

Page 1

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fi-1NPUT OVERLOAD

HIGJd FILTEH

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NOTCHIPEAK FILTER

70 MIG FILTER

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4. *-_CONTROL VOLTAGES->
COMPARATORS INVERTERS- BUFFE R5
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FILTER SHIFT

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HEATHKIT ®
MODEL HD4418
NOTES:
1. ALL RESISTORS ARE Ila-WATT, ss UNLESS MARKED OTHERWISE.
RESISTORS VALUES ARE IN OHMS III-1.000. M-I.DDO,DODI.
2. ALL CAPACITOR VALUES ARE IN DE IMIcROEARADSI UNLESS
MARKED IN PF IPIcOEARADSI.
3. Q INDIcATES A WIRE CONNECTION ON THE CIRCUIT BOARD.
4. 4- INDICATES A cHASSIs GROUND.
5. 47 INDIcATEs A CIRCUIT BOARD GROUND.
6. O INDICATES A no VOLTAGE (no-III MEASURED WITH A
HIGH IMPEDANCE VDLTMETER FROM THE POINT
INDIcATED TO cHASSIs OROUND. ALL MEASUREMENTS
WERE TAKEN WHILE THE FILTER WAS BEING POWERED
BY A ld-VOLT POWER DUDE.
1. ALL PUSHBUTTON SWITcNEs ExcEPT POWER ARE SHOWN IN THE
OUT POSITION.
3. ALL COILS ARE HAND-WOUND. IVAIUEs ARE NOT OIVENI.
a: THESE VDLTAOES MAY VARY WITH DIFFERENT SWITcH AND
CONTROL SETTINGS. W01;
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Part of 595-2980