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DIY Kit Triode Resistance Capacitance Coupled Negative Feedback Amplifier Module Kits

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The circuit is a typical two-stage impedance capacitance coupled negative feedback circuit. Two switches in the circuit can control the two - level coupling and feedback voltage. RP1 and RP2 in the circuit can change the DC working point of the triode.You can expand a lot of skill training content as needed. This circuit has good practical training value.

PCB Features:
The 1.6mm high quality colophony board adopts full process processing, the soldering disk is enlarged, the wire is thicker, the element layout is beautiful. It is specially designed for practical training, it is easy to withstand multiple times and repeatedly dissoldering, which can improve the efficiency of use and high cost performance.

Working Principle:
 This suite is a negative feedback amplifying circuit consisting of two triode transistors.
In the circuit, Q1 and Q2 are two NPN small power triode. R1-2 and RP1 are dc bias resistance of Q1. R3 is the load resistance of Q1. R4-5 is the negative feedback resistance of Q1.
R6-7 and RP2 are the dc bias resistance of Q2. R8 is the load resistor of Q2. R9 is the emitter negative feedback resistor of Q2. R11, C6 and S1 constitute negative feedback circuit, and the size of R11 directly affects the strength of negative feedback. C1, C3, C5 is the coupling capacitance. C2 and C4 is next to the emitter resistance capacitance, provides channels for communication signals, reduce emission negative feedback effect, makes the ac signal is not due to the existence of the emitter resistance and reduce the zoom function. S1 is a short circuit to test the changes in the output signal when there is no negative feedback. X1, X2 and X3 are signal input, signal output and power input. The power supply voltage is DC 12V, and the input signal can be used in 1KHz/2mV sine wave signal source, and the output terminal is connected with an oscilloscope to observe the output wave.

Signal Process:
The signal is input from X1, through the coupling capacitor C1 and R0 entering Q1 base, and output from Q1 collector after amplifying by Q1. And then through the C3, S1 into the base of Q2, and output from Q2 collector, through the output coupling capacitance C5 to C5 R10 load resistance, the output signal and a path through R11 to Q1 integration of negative feedback.

Circuit Diagram:

Component Listing:

NO. Component Name PCB Marker Parameter QTY
1 Metal Film Resistor R0-R3,R6-R8,R10-R11 47K 9
2 Metal Film Resistor R4 100ohm 1
3 Metal Film Resistor R5,R9 1K 2
4 Electrolytic Capacitor C1-C6 10uf 6
5 S9013 Q1-Q2 TO-92 2
6 Potentiometer RP1-RP2 50K 2
7 Male Pin   15P 1
8 Jumper Cap     2
9 PCB   38*42mm 1

Finished Product Picture:


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