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.
This simple circuit with good gain using just one transistor was published in Radio Electronics magazine...
March 2017 - This new component of Vishay has a 16-bit resolution that allows it to be used in a...
Found in documentation from the 1970s, this circuit for resistive loads uses a trigger...