This circuit generates a constant current given by R1. The load is on the high side of the feed (High Side). The circuit admits equivalent operationals and the source must be symmetrical.
We found this circuit in a 1977 publication for radio amateurs. It serves to test general purpose...
The purpose of this circuit is to amplify the signal of a medium or high impedance microphone,...
This unusual circuit from a Popular Electronics of the 90s uses LED indicators, operating as a...