10W audio power amplification circuit of μPC1238

Published:2011/6/22 20:45:00 Author:chopper | Keyword: 10W, audio power, amplification | From:SeekIC

The picture shows a 10W audio power amplification circuit.This circuit adopts integrated power amplifier μPCI238 as the amplifying device.The input signal is added to the in-phase input end(pin 1) of operational amplifier through coupling capacitance(capacity is lμF) and resistor(resistance is 56kΩ).Between the output end (pin 4) and inverting input end(pin 2) is a feedback resistor R1 whose value is 56Ω,and between the inverting input end and groud are resistor R2 whose value is 1KΩ and a 22μF capacitor.The voltage amplification times of the circuit is:Av=(1+R1／R2)≈(1+56／1)=57



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