We found this circuit in an American documentation from the 80s. The integrated circuits are operational amplifiers of the time. We can test modern comparators like the LM339.
This solid-state relay (SSR) or shield was found in a 1995 Electronics Now. The transistor can be...
This circuit simulates dusk by slowly dimming an incandescent bulb. It was found in the August 1998...
We found this circuit in December 1986, Radio Electronics magazine. It uses 3 inverters and has...