This circuit was suggested by Texas Instruments in a 1980s documentation. The transistor must be equipped with a heat sink. The transformer has 10 A secondary current.
We find this circuit in an American 1980s documentation. It triggers an alarm in the event of a...
This circuit is from an 80's documentation, making use of PUTs that are not currently common...
This circuit is from the time when cars used contact breakers. This 80's version measures the dwell...