Found in a 1965 General Electric circuit manual, this circuit uses SCRs from that time. Modern equivalents according to the power can be used.
This shortwave preselector was found in the July 1994 issue of Radio Electronics magazine. The...
This circuit was found in a 1980s American documentation. The data circuit has a low speed,...
This simple alarm with latching uses a relay as the main element. The circuit is from a Radio...