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 is one of many Morse code audio oscillators that can be found in this section. The circuit...
This circuit with germanium transistors was found in a 1980s documentation. The circuit makes use...
This circuit has the effects indicated in the table next to the diagram. We found it in the Radio...