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.
We found this circuit with JFETs in a Radio Electronics magazine from June 1969. The circuit has...
This detector with ultra-low deviation was found in an American documentation from the 90s....
This circuit is connected to the input of a good amplifier serving as a follower of audio signals or...