Heathkit HD 1250 Schematic
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Extracted text from Heathkit HD 1250 Schematic (Ocr-read)
Page 2
NOTES:
1. ALL RESISTORS ARE l/4-WATT, 5% TOLERANCE UNLESS
OTHERWISE NOTED. VALUES ARE IN OHMS (k'IOODI.
2. CAPACITORS LESS THAN 1 ARE IN uF; GREATER THAN 1
ARE IN pF.
3. '1: THIS SYMBOL INDICATES A CHASSIS GROUND.
4. v THIS SYMBOL INDICATES A CIRCUIT BOARD GROUND.
5. E THIS SYMBOL INDICATES AN EXTERNAL CONNECTION
TO THE CIRCUIT BOARD.
o. 0 THIS SYMBOL INDICATES A POSITIVE DC VOLTAGE,
TAKEN WITH A HIGH INPUT IMPEDANCE VOLTMETER
FROM THE POINT INDICATED TO GROUND, WITH
NO COIL IN THE OSCILLATOR CIRCUIT.
PARTS ARE GROUPED AS FOLLOWS
1-9 MOUNTED ON CHASSIS
11-19 MOUNTED 0N OSCILLATOR CIRCUIT BOARD
21-29 MOUNTED 0N DETECTOR CIRCUIT BOARD
--flm-__
--mmm-m
-mmn:--m
-.nmn__-
-Immn_-m
--Tmn_-
---lmn:-