Whats the purpose for the diodes I find wired into different circuits?
The purpose for the diode is to keep things from feeding back to try to cut or eliminate “noise” (as we say in electronics) from the circuit. See things like lights, alternators, and other electrical items create small electrical impulses (less that the circuit) which we call noise. On a digital circuit like your computerized fuel injection system the voltage is monitored closely on the different inputs. A voltage of 0 – about 2.2 is considered a low and a voltage of say 3.8 – about 5.2 is considered a high. What is the voltage between 2.2 and 3.8? Well, noise can put the signal at that voltage. The computer can get confused at those voltages and interpret that wrong and then we get poor running, missing, etc. In digital there is supposed to be a perfect square wave and the computer usually samples the center of the wave. The wrong voltage at that point (altered by noise) being read by the computer causes problems. That brings up another problem with old sensors. Sometimes an old senso
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- Whats the purpose for the diodes I find wired into different circuits?
