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GENERAL
DESCRIPTION
The circuitry used in this car radio incorporates 16 transistors 18 diodes and 3 IC (integrated circuit).
An external antenna feeds the AM broadcasting signal to the converter. The AM signal then goes through 2 IF amplifiers
to the diode detector and then to the audio stages.
|
|
An external antenna feeds the incoming FM or FM STEREO broadcasting signal to the FM RE amplifier. The FM mixer,
4 IF amplifiers, 2 diodes discriminator and multiplex (MPX) circuitry.
The audio signal passes through the 2 IC and push-pull audio output stages for each channel.
An AM AVC voltage is fed back to the RF amplifier and Ist IF amplifier circuit.
An AFC voltage is fed back to the FM oscillator circuit.
h FM
FM DETECTOR
iF TE AMP
Kee re eae)
aes
406)
TS
{07
6 | T7
aT
|
osc. (93 | fal FM at
Py
[ |
TAM DETECTOR
AMRF AMP
— AM CONV.
[+ e(ae tw Hae)
MP
,
.
—
a
RIGHT
SCA FILTER
in puTL+ qi2 } a]
|
-—
gf
=
TRANS
)
I9kHz LIS
a
—_—
IC-2
ai
"bes |
JRIGHT
ikea
po
Die
|JVMOCMULUL
POWER AMP.
LEFT
SPEAKER
fc
'
I
1
I
I
t
;
t
ROekAAA
ht
ATAR
- 8h
t
$
I
1
i
i
'
ee
—
a vy
cen
em
to
on om
——
<<
= on
om
ap
CANCELLER
VOLUME
TONE
(o
|
CONTROL
CONTROL
STELEO
PRE AMP
|
ic —I
STEREO IND.
IND. PL-3
% DRIVER
POWER AMP.
Figure 1 Block Diagram
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