This circuit, of a Popular Electronics of 1969 is destined to firing a gas LASER of the time. The circuit makes use of a high voltage transformer for triggering.
This interesting logic circuit was found in a manual of neon lamp applications. | Clique na imagem...
This circuit is from an American publication from 1970. It uses a coal microphone, which is...
This adjustable regulator uses the 741 and power transistors and can supply a current of up to 1...