This circuit was found in a 1968 General Electric documentation. It has an input impedance of 2 M ohms and excites a load of 16 ohms. The integrated circuit of the time is the PA237.
Charcoal microphones are rare today. In the figure we have a circuit that shows the use of one of...
This circuit causes one LED to light up if the voltage falls below the value set in R3 and the...
Found in a 90’s Electronic Design, this circuit generates stable signals in frequency given by the...