Simple Preamplifier for Microphones & Tape Heads

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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.

source: http://circuitsdiy.com/simple-preamplifier-for-microphones-tape-heads-etc