Datasheet LA4160 (Sanyo) - 5

LA4160
Sample Application Circuit 2 : Radio-Cassette Recorder
1000pF
2.2kΩ VCC 220μF 470μF
4.7μF
+ + + + 1000μF
8
Tape Radio MIC.J. MIC 9 10 11 12 13 14 20pF Power GND LA4160
SW1
SW2
7 6 5 4 300kΩ
+
47μF 3 30kΩ 22μF +
SW3 1S188 EAR.J. +
470μF
0.15μF (Polyester film
capacitor) 4.7kΩ SP 10kΩ
VR 56Ω
1S188
4.7μF
510Ω R/P Head 1
+ 100μF
100μF
51Ω + 10μF 51kΩ
0.033μF 2
+ 20kΩ
Tape
3.3kΩ SW4
Radio Meter Bias
OSC to Radio SW1 to SW4 (PLAY/REC SW) : PLAY An Example of Printed Board (Cu-foiled side)
220μF
470μF 4.7μF
pre in 2.2kΩ VCC
8 470μF LA4160 10pF
7
51kΩ
22μF
4.7kΩ 14 10μF
R/P SW 0.15μF 1 470μF
100μF
100μF 51Ω OUT Power in 30kΩ
1S188 4.7μF 680Ω 56Ω ALC IN
0.033μF 4.7μF
10kΩ pre out 1S188 6φ ALC SW 80×150mm2 Description of Application Circuit
1. Preamplifier
The preamplifier circuit consists of the input differential stage (TR9, 10), level shift stage (TR13), and output stage
(TR17, 18, 19). Since the output stage is of push-pull type, no remarkable drop in the output voltage occurs even at
low load impedances and the output can be connected direct to the ALC circuit and meter circuit. The external
DC/AC feedback resistor (Z2) can be set arbitrarily and the closed loop gain is obtained by the following equation.
Z2
VG (pre) 20 log (Z1) (dB)
The input impedance depends on internal resistance R2 which is 30kΩ. No.870-5/11