This simple wireless microphone circuit for the MW band was found in an old American documentation. The coil is the oscillator of an old MW radio.
This circuit automatically inverts the test leads connection according to the polarity of the...
With a touch of the push button the lamp is switched on. A new touch and the lamp go out, in this...
This 80's circuit uses a light-sensitive SCR or LASCR and a one-sided silicon switch SUS, uncommon...