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 circuit, which may have appeared elsewhere on this site, is from the integrated...
This circuit is from an Italian magazine of 1983, but it can be assembled with the most modern...
This 100 Hz filter was found in the August 1993 issue of Electronics Now. The components can be...