This photoelectric sensor that triggers a relay was found in an English book from 1989. The transistor is a general-purpose type, and the integrated circuit consists of an operational amplifier.
We found this circuit in a Popular Electronics from the 80s. It is a game of reaction speed for 3...
This circuit was obtained in the Linear Technology Applications of 1997. The circuit uses common...
This circuit appeared in the September 1973 issue of Radio Electronics magazine and was...