This circuit was obtained in documentation on medical applications from 1966. The circuit is used in electromyography by switching the electrodes used with the equipment.
This is a simple variac type source found in the July 1962 Radio Electronics magazine. Voltage and...
I found this circuit in a 1986 English magazine. It can still be easily assembled, replacing the...
The components of this circuit from the 70's are no longer common on the market, but it is...