The circuit shown consists of a power stage for relay excitation. 2N3053 can be a BD135 and 2N406 can be replaced with a BD136. R3 depends on the trigger voltage.
We found this circuit in a 1998 documentation. The circuit can also be used as a minutery...
Found in a 1968 Electronics World, this circuit uses operational amplifiers from that time. |...
This circuit was found in a Radio Electronics issue from May 1989. Please note that it may not...