This circuit also appears elsewhere on this site, obtained from other sources. This is an 80's American schematic book. Instead the lamp can be used white high-brightness LEDs.
Found in old American documentation, this circuit makes use of operational amplifiers from the 70s...
Toshiba LDO Regulators Toshiba has a wide variety of low voltage drop (LDO) linear regulators...
This circuit was published in a 1977 English magazine, but it can be easily assembled since all...