This circuit was found in a 90s Popular Electronics. It is possible to analyze the voltages of an automotive battery. The integrated voltage comparator circuit admits equivalent.
This digital instrument input circuit was found in the September 1989 issue of Radio Electronics...
Found in an Electronic Design of 1964, this circuit operates with control voltages from 0 to 12 V...
This two-way switch or control shows how to control a lamp from two points. This version is from a...