The circuit of the hearing aid is shown in the figure. It is essentially a multi-stage audio amplifier composed of transistors VT1 to VT3. VT1 and the peripheral resistor and capacitor components form a typical resistor-capacitor coupling amplifier circuit, which is used for pre-audio voltage amplification; VT2 and VT3 form a two-stage direct coupling power amplifier circuit, in which: VT3 is connected in the emitter output form, and its output impedance is low, so as to match the 8Ω low-impedance earphone.
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