This circuit for incandescent lamps was found in a 70s documentation. The circuit uses an SCR according to the power of the controlled lamps. The delay is a few seconds, given by capacitor C1.
The figure shows a Wien Bridge circuit with non-linear feedback. The resistance of the RL lamp is...
This commercial medium and short-wave radio was manufactured in Japan in the 60s. The circuit has...
The energy that powers this radio's amplifier circuit is obtained from the signal itself. The coil...