This circuit of starting lights for auto-race was found in an English documentation from the 80's. The LEDs must be of different colors, for greater realism.
This pulser, found in a 1979 publication, airs and closes the relay at a frequency determined by...
The XR2206 integrated circuit consists of a complete function generator. It is not a current...
Found in a September 1992 Radio Electronics magazine article, this circuit generates a pulse as...