The purpose of this 1965 Radio Electronics circuit is to observe cycloid waveforms on a standard oscilloscope. The frequency range depends on the switch settings.
This circuit was found in a 1980s documentation. It decodes by identifying a certain frequency tone...
The purpose of this 2000 documentation circuit is to decode SSB (BLU) signals to be audible on...
This circuit was found in Electronics Handbook, Vol XIII 1993 and consists of a simple direction...