Heathkit HD 1986 Schematic
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Extracted text from Heathkit HD 1986 Schematic (Ocr-read)
Page 1
SCHEMATIC OF THE
HEATHKIT®
MODEL HD-1 986
MICROLIZER
NOTES:
1. ALL RESISTORS ARE 1/4-WATT, 5% UNLESS MARKED OTHERWISE.
RESISTORS VALUES ARE IN OHMS (K=1.000.M=1.000,000).
2. ALL CAPACITOR VALUES ARE IN uF (MICROFARADS) UNLESS MARKED
IN pF (PICOFARADS).
3. O INDICATES A WIRE CONNECTION ON THE CIRCUIT BOARD.
4. "é" INDICATES A CHASSIS GROUND.
5. v INDICATES A CIRCUIT BOARD GROUND.
e. O INDICATES A Dc VOLTAGE (120%) MEASURED WITH A HIGH
IMPEDANCE VOLTMETER FROM THE POINT INDICATED TO
CHASSIS GROUND. ALL MEASUREMENTS WERE TAKEN WHILE
THE FILTER WAS BEING POWERED BY A 9-VOLT BATTERY.
r---------------------------------------------------- ----- .---------------------------------------------------------
MIC GAIN
9 'VOLT -
BATTERY _ m
R11
IOK
AUDIO/OUT
GND
9 -..-------..---....--------..-........---..---..-----..---..---..
GND
-.....--....--- Q -....
J 2
MICROPHONE /0UT