This circuit, with printed circuit board included, is from a Radio Electronics magazine from July 1971. The SCR can be any equivalent of the 106 series.
January 2017 - Through Mouser Electronics Texas Instruments is launching its new zero-drift...
This circuit can be used to test continuity or even semiconductors. We found the configuration in a 1987...
I found this circuit in an Electronics Handbook from 1989. The circuit can be assembled with a...