This configuration was found in an English magazine from 1965. It is valid for any junction FET. The input impedance is 5.5 M ohm higher than conventional stages.
The circuit presented is a game based on an integrated TTL of type 7473. In the figure we have a...
This simple timer with unijunction transistor was found in an old American technical...
This simple oscillator with a photocell was found in a Radio Electronics from January 1965. The...