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.
This circuit split the voltage of a Power supply allowing it to be used as dual supply. The limit...
In the figure we have a simple timer with two voltage comparators of the four of an LM339. The...
This circuit allows coupling optical signals to a TTL input with excellent performance. Among the...