This electronic rheostat with SCR was found in the June 1964 Radio Electronics magazine. The SCR may be a modern type and the 2W potentiometer may be 470 ohms.
This simple MW radio does not need an external antenna to pick up local stations. It was found in a...
This simple receiver picks up local MW stations with playback on a small speaker. The antenna must...
This is a converter stage found in old transistor superheterodyne radios. The circuit is for...