Alternating voltage amplifier with transistor - has second transistor which is added to network to form Darlington circuit

摘要

The circuit comprises a capacitor (9) whose capacitance represent practically a short-circuit for an input voltage of a specified lower frequency, and there is a resistor (7) whose resistance is such that it practically does not load the amplifier output, and which also does not cause too high a voltage drop at the first transistor (1). A capacitor may be connected between the base and the collector of the transistor (1), and there are two other capacitors in the circuit. There is a second transistor (2) whose base is connected to the emitter of the first transistor.