This is one of the many versions we have of a 12 V power supply with the 7812. We found it in the Radio Electronics magazine of July 1984. The integrated circuit must be mounted on a heat sink.
This simple NiCad battery charger was found in an English documentation. Resistors R2 and R3...
This was a very popular instrument in the workshops of the 60s and 70s. It was a "top of the line"...
We found this circuit in a 1981 publication, when it was still possible to find 22.5 V batteries (used...