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 1968 documentation, this small amplifier was very popular at the time being used in...
Found in Electronics now, this circuit generates signals given by the formulas next to the...
The circuit shown can be used to send command pulses from a cogwheel or other sensor placed...