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 circuit is from an application manual for linear instruments from Texas Instruments. The...
This circuit from a Japanese publication in 1968 uses germanium transistors from the time like the...
The presented circuit uses a window comparator to keep a relay activated only when the sensor is...