This circuit produces sounds of 6 different notes depending on the keys activated. The circuit is from a Radio Electronics from May 1965. The transistor must be equipped with a heat radiator.
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...