A FET audio amplifying circuit

Published:2011/7/13 20:05:00 Author:leo | Keyword: FET, Audio, Amplifying circuit | From:SeekIC

Picture 1 shows a FET audio amplifying circuit which demands small distortion, broad frequency bandwidth. The input terminal uses Knot type FET which can eliminate the influence to circuit caused by change of source voltage and current moving. DC stability is the main problem of direct-coupling DC amplifier which needs to use two level difference circuits. The first level difference circuit is formed by N channel FET, VT1 and VT2. The second level difference circuit is formed by PNP, VT4 and VT5, which has a high voltage amplitude of vibration and bigger distortion that should be paid attention during design.



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