Found in a 90s documentation, this circuit triggers the SCR when there is an overvoltage in order to cause the fuse to blow quickly. The SCR can be a TIC106.
Suggested by a 1968 Motorola power semiconductor manual, this circuit uses a special transformer and...
This windshield wiper timer was obtained in an 80's Hands On. The transistor can be the BC548 and...
Both the operational amplifier and the diodes admit equivalents in this circuit suggested by...