The two circuits shown show how to obtain an SSB / CW control for receiving this signal top at a common receiver. The circuits were found in an old American manual from the 80's.
The purpose of this circuit is to provide a constant current to an experimental electromagnet. The...
This Headset Coupler or Phone Patch was found in an American 1980s amateur radio documentation. The...
This small circuit for the medium or short-wave range, depending on the coil, was found in a...