Found in documentation from the 1990s, this circuit drives an SCR with a delay that depends on C1 and can be set to R1. The load depends on the SCR.
This progressive circuit has a lock allowing coded activation. We found this configuration in...
This simple circuit tests electrolytic capacitors from 1 uF with a working voltage above 12 V. The...
This circuit was found in an American publication from the 70s, but it can be assembled with more...