This circuit was found in a 90s Motorola documentation. The circuit uses two SCRs that must be chosen according to the controlled load. The time depends on CE.
This circuit for tape recorders was found in the February 1990 Radio Electronics magazine. The...
This circuit is found in many LM339 manufacturer's manuals. This is from the SGS manual of...
We found this circuit for different frequencies in an American documentation from the 60's. The...