Suggested by an American publication of 1964 this circuit is intended for the capture of signals from film tracks recorded by optical systems, common at the time.
The circuit shown was obtained from a 1976s publication for radio amateurs. Its purpose is to...
We found this decoder in a 1966 General Electric publication. It makes use of general purpose...
This circuit consists of a small inverter to light a low voltage neon lamp. The circuit is from a...