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 power supply can be implemented with a TIP32 providing an adjustable output at the 2k2...
This circuit found in the October 1975 issue of Radio Electronics magazine uses an integrated...
This circuit was found in National Semiconductor documentation from the 90s. The circuit uses two...