This simple injector and signal follower employs a high impedance headset. Transistors can be of general use. The circuit is from old American documentation.
We found this circuit with PUT in an American publication from the 1980s. PUT is not a common...
This circuit was found in a 90s Popular Electronics. The circuit uses components from that time,...
This electronic ignition for cars of the time was found in the Radio Electronics magazine of May...