This circuit is the receiver for the previous transmitter modulated by an audio signal. The transducer is a ceramic capsule, in which case the circuit becomes ideal for telegraphic transmissions.
This circuit can be interleaved between guitars and guitars to give the fuzz distortion effect. The...
This transceiver circuit was found in a 1997 documentation. The circuit operates in the 80 meters...
This circuit uses a GE optical coupler. Equivalents can be tried. The circuit is from the GE...