LA4160 Preamplifier Circuit Since the maximum output voltage for THD = 1% drops at less than 600Ω of the composite load impedance viewed from output pin (6), it is desirable to make the composite load impedance more than 600Ω when using this IC. (Refer to VO max, THD – RL characteristics.) 2. ACL Circuit Preamplifier input R32 2.2kΩ 9 + 6 Preamp. R35 Meter R20 10 14 300Ω ALC OUT R1 3kΩ ALC IN control pin R31 300Ω TR2 VCC 1S 188×2 R33 5 TR1 C5 R34 11 C4 Voltage doubler rectifier The ALC circuit is of Darlington configuration which consists of TR1, 2. The collector-to-emitter impedance of TR1 made variable by the DC voltage to be applied to control pin (5) and the input voltage of the preamplifier is controlled. Whe the DC voltage to be applied to pin (5) is set at approximately 1.1V, TR1, 2 are turned ON and ALC is turned ON. For the rectifier circuit, it is recommended to use the voltage doubler rectifirer which is excellent in compression ratio. For the sets of 6V VCC, it is recommended to use a germanium diode so that the ALC width can be made wider even at the time of decreased voltages. No.870-6/11
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