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power amplifier(STK6153,STK3048) circuit of thick film integ

2015-01-01 05:45  
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power amplifier(STK6153,STK3048) circuit of thick film integrated package
The picture is a power amplifition circuit of thick film integrated package.Picture (a) shows that input signal is loaded to in-phase end of STK3048 through resistace-capacity coupling circuit(resistance is 33kΩ,capacitance is 4.7μF) and it is added to the base of power tube Q1,Q2 by its output end after it is amplified by thick film power amplifier STK3048.The power amplifier adopts dynatron 2N3055 and MJ2955.R1,R2(0.25Ω) are protective resistors of common emitter. Adjusting potentiometer RP can make power tube in the stage of classA,B,and at this time,the voltage drop of R1,R2 is about 10~13mV,the quiescent current of corresponding Q1 and Q2 is 40~50mA.