transistor audio signal amplifier

transistor audio signal amplifier

Shown is the audio signal amplifier of a small recorder . The microphone signal is adjusted by the potentiometer RP1 and then added to the base of the transistor VT1
. R4 is connected to the emitter of VT1 as a current negative feedback resistor to stabilize the DC operating point. C3 is used as a decoupling capacitor. V TI AC gain is increased, and
the audio signal is amplified by three levels and then added to the primary coil of transformer TI . The collector output of VT3 is fed back to the base t of VT1 via Ri8 and Cl6
to improve the frequency characteristics of the amplifier. The amplifier's output uses a voltage transformer to compensate for high-frequency signals. The circuit is powered by 3V low voltage and
only requires 2 batteries, which consumes less power.