Simple Preamplifier for microphones, tape heads, etc

This circuit consists of a single transistor as amplifier and it gives a nice amplification to weakest and unipolar signals for feeding to a real amplifier.

The center of this circuit is a BC547 OR BC548 transistor and the rest of the circuit is few resistors, and capacitors.

The diagram and also the PCB layout is below.

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6 Responses

  1. Saibal Roy says:

    Hi sir, i am made this circuit but sound is not requard, i am powerd this circuit 12v 1A transformar plz give me a sugation…..

  2. SAIBAL ROY says:

    first i amplify the microphon sound via this circuit and then i added the sound my 4440 ic amplifire

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