This circuit is designed to measure very weak currents, in the order of picoamperes. We found it in an American documentation from the 80s. The integrated circuit is from that time.
Foto-Darlington for applications such as light sensor. In normal applications only the collector and...
This circuit was obtained in a Teledyne documentation from 1972. The operational amplifier admits...
This circuit for incandescent lamps was found in the January 1980 Radio Elecronics magazine. The...