This circuit was found in an American magazine 73 for radio amateurs of the 80s. It is an automatic transmission circuit for telegraphy. The circuit is TTL.
This circuit, found in documentation from the 1990s, uses a common 7-segment LED display. The...
We found this circuit in an early American 80's documentation. We note that the first gate of the...
Using a V/F converter this circuit was found in the June 1991 issue of Radio Electronics magazine. The...