We found this circuit in Radio Electronics from the 90s. The components are current. The sensor is a common general-purpose transistor. The connection to the sensor is made by twisted pair.
This circuit was found in documentation from the 90's. The load can be a relay and the sensor an...
The presented circuit is used in Power supply to increase the voltage output. The voltage output...
Found in a 1967 Electronics World, this preamplifier uses an integrated circuit from that time,...