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 is from National Semiconductor using an LM11, which is uncommon nowadays. The circuit...
Although it uses a dual-channel FET, which is hard to find today, this circuit was released in a...
We found this circuit in the April 1979 Radio Electronics magazine. Note the filter capacitor bank...