In Darlington pair, two bipolar transistors consist this compound structure wherein the current amplified by the first transistor is amplified by the second transistor. To minimize distortion, the output stage is formed by the Darlington pair of Q2 and Q4, Q7 and Q11, while Q8 and Q9 provide constant current through the bias chain. The input signal of the circuit, as the Q1 operates in common emitter mode, is delivered to the bias chain of D14, D13, D6, Q9 and Q8. The transistors 2N3055 and MJ2955 are functioning as power transistors because the structure is intended for power switching circuits, series and shunt regulators, output stages and high fidelity amplifiers. The 15 Watts power is made possible by using a dual 20 V power supply into a load of 8 ohms. MJ2955 – the complementary PNP type of 2N3055.2N3055 – a silicon NPN power transistor intended for general purposes.Amplifier – any device that changes, usually increases, the amplitude of a signal.
The circuit was designed to create an amplifier that will supply 15 Watts to any load using discrete components.
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