Parameter:

Working voltage: DC 6-12V

Features:

Single-tube amplifier circuit kit, the input voltage signal is amplified, the magnification can be adjusted, and the principle of triode amplification can be learned. Can be used as an electronic technology basic training kit, or as a middle school, a practical teaching kit, suitable for electronic enthusiasts to get started

Circuit principle: This circuit is a voltage-divided current negative feedback single-stage low-frequency small-signal amplifier, which uses RP, R1, R2 to divide the fixed base potential; then use the emitter resistor R4 to obtain the current feedback signal, so that the base current occurs. Corresponding changes to stabilize the static working point. Q is a transistor, RP and R1 are upper bias resistors, and R2 is a lower bias resistor. The power supply voltage is divided to provide a bias current to the base. R3 is the collector resistance, R4 is the emitter resistance, C3 is the emitter resistance bypass capacitor, providing the channel of the AC signal, reducing the loss during the amplification process, so that the AC signal does not reduce the amplification capability of the amplifier due to the presence of R4. C1 and C4 are coupling capacitors, and C2 is a damping capacitor for eliminating self-excitation that may occur in the circuit.