2W音频放大器电路

2w音频放大器电路his was one of the earliest circuits that i ever designed and built, in spring 1982. at that time i had only an analogue meter and a calculator to work with. although far from perfect, this amplifier does have a wide frequency response, low distortion, and is capable of driving an 8 ohm speaker to output levels of around 5 watts with slightly higher distortion. any power supply in the range 12 to 18 volts dc may be used.
circuit description 电路说明
the amplifier operates in class ab mode; the single 470r preset resistor controls the quiescent current flowing through the bd139/140 complimentary output transistors. adjustment here, is a trade-off between low distortion and low quiescent current. typically, under quiescent conditions, standby current may be 15 ma rising to 150 ma with a 50 mv input signal.

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