The circuit in the figure uses two operational amplifiers: an LM101A and an LM102. Diodes admit equivalents and resistors do not have to be accurate. The power supply must be symmetrical.
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....