This timer was found in Japanese documentation from the 1960s. The transistor can be replaced by an equivalent and the relay must be of the sensitive type with voltage according to the power supply.
We found this limiter (clipper) in a French documentation from 1982. The circuit applies to any...
Found in documentation from the 1990s, this circuit converts 12 V to 9 V from a car's power...
This circuit is used to test SCRs like the ones of TIC series. The simulation shows the power line...