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.
This circuit was found in an 80's Electronic Design. The frequency depends on the crystal and the...
This bidirectional current sensing circuit was found in a 2005 Linear Technology application manual....
Found in old documentation, this circuit is intended for low level amplitude modulation with low...