A power amplifier circuit made with LM317 ----- LM317 Power Amplifier

A power amplifier circuit made with LM317, LM317 Power Amplifier Keywords: LM317, amplifier, power amplifier The power amplifier for successfully placed with a regulated set, for the electronic enthusiast, as an attempt to pioneering ideas, there is no positive meaning. The circuit is a purel classification, and the low noise tube is used as a voltage amplitude, so the indicators such as THD, NF are good, and the output power can reach 30W. As shown in the figure, the transistor VT1 is amplified as a voltage, and the operating current is only 0.6mA due to the input impedance of the regulator integrated circuit IC1, and the working current is sufficient, R1, C3 is a power supply decoupling, and C4 is used to prevent parasitic oscillation. R3, R4 partial pressure provides offset and DC feedback to VT1 to improve linear and DC stability. VT2, R5, R6 and diodes constitute a constant current source, used to improve the efficiency and output power of the circuit, and increase the output dynamic range. Since the circuit is particularly simple, the element can be soldered, the constant current of the constant current source can be disposed at 10 to 15 mA, and the output voltage of the LM 317 is adjusted to the power supply voltage when debugging, and the static current is about more than ten millians. The power transformer T1 power is not less than 50W. The triple-end regulator Ic selection LM317, and the triode VT1 is selected 9014. VT2 is selected from 8050, diode VD5, VD6 to select 2CP 20, and the power of the transformer should be greater than 50W.

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