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Electric Rev counters

Discussion in 'General Electronics Discussion' started by michealmolach, Feb 19, 2010.

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  1. michealmolach


    Feb 19, 2010
    I have some electrical understanding but cannot work out how electrical rev counters work and more specifically why there are different ones (or switches on them) for different numbers of cylinders.
    Can anyone point me to some diagrams and information on the different counters and how they work?
    Also, how to test that a rev counter works or that the signal from the motorbike or car is correct?
    I've only got an analoge multitester to work with.

  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    Jan 21, 2010
    The ones where you have to tell them how many cylinders you have are the type that count the number of "sparks" generated. Because there are more per revolution when you have more cylinders, the counter needs to know this.

    The easy way to test one is to hook it up to a car with a known good tacho and set the engine revs to (say) 2500. The counter under test should read the same.

    For tachometer circuits, did you try googling for "tachometer circuits"?
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