The circuit shown in the figure below is from the 1993 Linear Technology Applications. The operational ones used are uncommon and the use of equivalents can be analyzed.
Found in a 1991 Hobbyst Handbook, this circuit monitors both battery and alternator voltage. The set...
Found in RCA documentation from the 1970s, this circuit uses currently unusual integrated...
Among the alternative energy sources, one of the most promising is that represented by Astro-Rei....