This circuit uses components that are still common despite being from 1995 documentation. The circuit can be powered by 6 to 12 V voltages and the speed of the LEDs' sliding effect is set to P1.
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....