Heathkit AR 27 Schematic 2

Page 1

NOTE:

I.

5.
6.
7.

8.

9.

FM TUNING UNIT

F-------------------------------------------_---------------------

G"
23A240
C3 (OR EQUIVALENT)
RF AMPLIFIER

_'

-.-n---.n

02
25A240
(0R EQUIVALENT)

C 7 MIXER

e -6

I C18

I

I /

I / 5 I 5

I TUNING

' L____~___T___"E___J

: /

: /

: /

I // l I
I 4

: / cu

: /

: /

I / -

: /

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I

I / 23A239

' L _ ,_ _ _ ________________ __ _ _ .1 (on EQUIVALENT)

: LOCAL R,
I OSCILLATOR I2I
I

I .- r

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l--_--------------------------------------.------------'------.

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INPUTS

PHONO@
SCHEMATIC OF THE

HEATHKIT® =-
SOLID-STATE MONO
FM RECEIVER
MODEL AIR-27

RESISTOR AND CAPACITOR NUMBERS ARE IN THE FOLLOWING GROUPS:

0-99 NUMBERS IN THE FM TUNER SECTION.

100499 NUMBERS IN THE AMPLIFIER SECTION.

200-299 NUMBERS IN THE POWER SUPPLY SECTION.

* DENOTES PARTS NOT MOUNTED ON THE CIRCUIT BOARD.

ALL RESISTORS ARE I/2 WATT UNLESS MARKED OTHERWISE. RESISTOR VALUES ARE
IN OHMS [K = 1000, MEG = 100mm.

CAPACITOR VALUES LESS THAN I ARE IN Ind. VALUES OF1 AND ABOVE ARE IN pF,
UNLESS THEY ARE MARKED OTHERWISE.

OTHIS SYMBOL INDICATES A POSITIVE DC VOLTAGE MEASUREMENT. TAKEN WITH
AN II MEGOHM ELECTRONIC VOLTMETER OR VTVM FROM THE POINT INDICATED TO
CHASSIS GROUND.

[I INDICATES 8+ VOLTAGE POINTS.
0 INDIC ATES cannscrmo POINTS ON THE CIRCUIT BOARD.

REFER TO THE CIRCUIT BOARD XwRAY VIEW AND CHASSIS PHOTO FOR THE PHYSICAL
LOCATION OF PARTS.

-- INDICATES CW ROTATION.

ALL VOLTAGES ARE MEASURED WITH NO SIGNAL INPUT.

SOU RCE