This circuit was found in a publication by Edelman from 1924. The power comes from the battery and the listening is through a high-impedance headphone.
Found in old documentation for radio amateurs, this circuit is intended to excite a MOSFET on the...
The lie detector we presented was created by a professional detective and found in a 1982...
This circuit allows to obtain an output pulse independent, in duration, of the action time on...