This circuit was found in the component's own manual, which is not very common nowadays. Note that the circuit requires the use of a symmetrical power supply.
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...