Simple structure hi-fi amplifier

Circuit shown in Figure 240 of the circuit structure is very simple, with only four transistors to achieve circuit from input voltage put large, inverted, and promote the whole

process of the amplifier, and a high technical indicators circuit, is an excellent high-fidelity power discharge path. VTi for the input stage, the use of a PNP transistor input stage and both impedance matching function, VTz voltage amplification stage and both CE and inverted push function, VT3 and VT4 constitute complementary push-pull amplifier output stage O R7, and R Pat negative feedback loop and determine the circuit gain: Av-R7 cuddle 8-2.7/0.22, together 21dBo bootstrap capacitor C3, R6 for the isolation resistance.

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