This circuit was obtained from an 80's Radio Electronics. The circuit decodes “scrambled” or sinusoidal encoded signals by providing an audio signal at the output.
This circuit is part of a sound system project published in the October 1970 issue of Radio...
In the figure we have an input circuit for a receiver in which conventional transistors were...
This mid-waveband wireless microphone was found in a Raytheon transistor manual from the 1960s. The...