This circuit is from the 1989 special edition of Radio Electronics Experimenter. The circuit was created with SMD components to be mounted on a keychain.
Found in an Elektor from the 90s, this circuit can be powered directly by the power grid. The...
This amplifier was published in the July 1961 Radio Electronics magazine. It announced the release of...
The speed of the motor connected to this circuit depends on the amount of light that strikes the...