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Power Amplifier Circuit Made of LM317

2014-11-24 03:52  
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Power Amplifier Circuit Made of LM317
This circuit is Pure Class A, and using a low noise tube as its voltage amplifier, so the THD, NF indexs are quite good. Its output power can reach 30 W. As shown in the figure, VT1 transistor is used as voltage amplifier, because the input impedance of the integrated circuit IC1 is high, the working current of 0.6 mA is enough. R1, C3 are power decouplings, and C4 is used to prevent parasitic oscillation. R3, R4 will divide pressure to provide offset and ac/dc feedback to VT1 to improve the linearity and dc stability. VT2, R5, R6 and diode form a constant flow source, which is used to improve the efficiency and output power of the circuit, and increase the output dynamic range.