Using a 106 series SCR, this circuit was found in the May 1971 Radio Electronics magazine. The quiescent current is very low and is given by the value of R1.
This highly-sensitive circuit causes a relay to be closed when the other is open or still...
In the figure we show how to implement an audio oscillator with the 741 integrated circuit by...
This 9-pixel circuit has been implemented with 9 LDRs and can be coupled to a processing system for...