Transistor recording signal amplification circuit

Transistor recording signal amplification circuit

Shown is a transistor recording signal amplification circuit . The microphone signal is adjusted by the potentiometer RP1 and then added to the transistor VT1. It is a
common emitter amplifier . The emitter connected to VT1 serves as a current negative feedback resistor to stabilize the DC operating point. C3 is The decoupling capacitor increases the AC gain of VT1
, and the audio signal is added to the primary coil of transformer T after three-stage amplification. The audio signal is sent to the recording head via transformer coupling
for recording. The secondary winding of the transformer is connected in parallel with a 200 pF capacitor to enhance the high-frequency signal and compensate for the high-frequency loss during the recording process.
The collector output of VT3 is fed back to the base of TV1 via Rcs. C16 to improve the frequency characteristics of the amplifier. The output of the amplifier 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.