This circuit was found in a Radio Electronics magazine from June 1962. The circuit is for cars of the time with platinum ignition. The indication is made on an analog instrument.
Found in a 90s Popular Electronics, this circuit is based on a uA739, an unusual component today....
This circuit is from a 1982 publication. It is a sequential effect of accelerated LEDs. The...
In the figure we have more circuit that makes use of transistors and that has excellent...