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.
Found in a 1969’s documentation, this circuit can supply currents from 100 to 120 mA at loads of...
We found this receiver in old documentation. The transistor is made of germanium and the...
We found this project in a 1982 publication. What we have here is an audio signal relay trigger, which...