This circuit is from a 1967 General Electric SCR manual. The capacitors are polyester and the inductor must have current according to the controlled load.
In relation to the previous circuit (CB18493E) this spy has an extra transistor, which can be a...
We found this sophisticated meter circuit in an article in Radio Electronics magazine from June...
The circuit used is the 4093 configured as an inverter in this application from Radio Electronics from...