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 is from an old American publication. The indicated transistor is oversized as the 15 V...
This circuit was found in a publication in the 1950s, mainly applying to germanium transistors of the...
The circuit presented is from the 1990 Motorola Linear Databook. The circuit does not need a...