This TTL circuit was found in the December 1990 issue of Radio Electronics magazine. The circuit has a 50% duty cycle. It must be powered by 5 V.
This old slide projector control circuit was found in an 80s Hands On. The circuit uses modern...
In the figure we have a circuit that uses unusual components, being indicated for low frequency...
The sensor of this circuit found in Popular Electronics can be formed by a piece of fabric between two...