This digital circuit is from a Radio Electronics magazine from December 1991. It does not use a microcontroller, but rather discrete digital circuits of the time.
The two circuits shown show how to obtain an SSB / CW control for receiving this signal top at a...
This variable voltage regulator circuit has a power stage capable of supplying currents up to 1 A....
We find this encoding circuit in an American 1980s amateur radio documentation. The circuit can be...