This circuit was found in a 1968 General Electric documentation. It has an input impedance of 2 M ohms and excites a load of 16 ohms. The integrated circuit of the time is the PA237.
This circuit consists of a constant current source for charging 12 V batteries. The charge is...
This simple neon lamp power indicator circuit was found in the January 1971 Radio Electronics...
We found this sophisticated meter circuit in an article in Radio Electronics magazine from June...