The signals from this circuit obtained from the 1965 Radio Shack documentation are picked up from a medium wave receiver. L1 and L2 have 80 to 100 turns of yarn 28 on a ferrite rod.
This circuit was found in a General Electric / RCA documentation from the 1980s. The circuit is...
This circuit can be used in demonstrations or science fairs. The circuit uses headphones and can...
This circuit was found in the May 1989 issue of Radio Electronics magazine. The components can be...