SUPER EAR
This circuit is a very
sensitive 3-transistor
amplifier using a
speaker transformer.
This can be wound
on a short length of
ferrite rod as show
above or 150 turns
on a 10mH choke.
The biasing of the
middle transistor is
set for 3v supply.
The second and third
transistors are not
turned on during idle
conditions and the quiescent current is just 5mA.
The project is ideal for listening to conversations
or TV etc in another room with long leads
connecting the microphone to the amplifier.
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