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LA1787M
? AM high band cut and detector output level adjustment methods
The pin 31 AM and FM tuner output has an impedance of 10 k ? in AM mode and a few tens of Ohms in FM
mode. Therefore, R31 is used to lower the AM detector output level and C31 determines the AM high band
frequency characteristics.
VCC
FM
detector
31
AM
detector
VCC
10 k ?
R31
C31
+
Noise
canceler
input
50 k ?
30
A12086
Fig. 39
? AM stereo system pins
To the AM stereo decoder
45
VCC
IFT
GND
39
400 mV rms
450 kHz output
VCC
50 pF 150 ?
Keyed AGC
IF AMP.
Fig. 40
A11761
No. 6655-40/54
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