This circuit was found in the February 1980 issue of Radio Electronics magazine. The digital circuit was shown in two parts, using 20 LEDs in a configuration with the LM3914.
This 15 V regulator uses the integrated 100 mA L series. The circuit was suggested by Motorola's Linear...
This circuit was obtained in a 1991 Electronics Handbook. The publication no longer exists, but...
This circuit with a maximum current of 50 mA was found in the August 1998 issue of Electronics Now magazine....