We found this circuit in a 1991s PE Hobbyst Handbook. The circuit fires 10 LEDs that can control incandescent lamps according to their maximum current.
This comparator circuit was found in the May 1988 Radio Electronics magazine; The power supply does...
Instead of the lamps, LEDs can be used in series with 470 ohm resistors. The circuit is from an...
This circuit, from an American publication of 1974, provides a 0.005% regulation with a variation of...