Found in a Popular Elecronics from the 90s, this circuit appears in other versions in this section and on the website. The circuit draws one of 10 LEDs and has a sound effect produced during the draw.
When the 24 V battery voltage drops below 18 V, this circuit cuts off its discharge. The circuit...
High voltage electrolytic capacitors can be recovered by applying high voltage to their terminals. This...
This shield circuit is suggested by Motorola, using a 4N26 type coupler and an MC1733 type...