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 a 90’s Electronics Now, this circuit has its output connected to an audio amplifier. The...
This configuration that appears elsewhere on this website and in this section was suggested by...
This circuit was designed to power the previous circuits of the wireless sound system, but it can...