This compact power supply can be used on the workbench for up to 1 A load. The transformer has 1 A secondary current. The integrated circuit must be mounted on a heatsink.
This circuit with integrated TTL 7400 has a good teaching purpose, drawing one of two LEDs. The...
Found in American documentation from the 70s, this circuit uses components of the time, uncommon...
This circuit makes use of a diac to stop the activation of a sensitive reed relay 1 mA. The trip...