This circuit for alternating current loads has a built-in timer. SCR2 is according to the motor current and must be equipped with a heat sink. The circuit is from a 70s GE documentation.
This circuit for analog video signals was found in a March 1988 Radio Electronics. The Maxim...
This circuit was found in an American 80's documentation. However, it can be implemented with...
This circuit appears elsewhere on our site with a variety of transistors. This one is from a Radio...