This is the basic full-scale circuit of an LM3914 for voltage measurement or voltage triggering and control. The power supply must be within the indicated range.
Other CMOS gates can be used in this sensor, which we found in the July 1995 Electronic Now...
This circuit is from the American magazine that no longer exists Science & Electronics,...
Using the 4046 PLL we found this circuit in the December 1989 Radio Electronics. The circuit...