This circuit was obtained from an 80's EDN. The components used are still common. The circuit can be used as a shield and the frequency is approximately 775 Hz.
This power converter or inverter was found in a 1980s documentation. Transistors should be fitted...
This circuit consists of a voltage regulator for 6 V batteries with a very low voltage drop. The...
I found this circuit in an English magazine from July 1982. The circuit is still viable by using...