This sensor circuit for currents of the order of nanoamperes was found in an American documentation from the 1980s. The components are from that time.
Standing wave ratio or SWR is an important measure of whether all power from a transmitter is being...
This circuit is from 1976 Radio Shack documentation. It detects when rapid variations in the light...
This circuit was found in an Electronics Now of the 90s. It is intended for amplifying composite...