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I need help in how to make a tach with a multimeter

Discussion in 'Electronic Basics' started by Gilbert, Jun 5, 2005.

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  1. Gilbert

    Gilbert Guest

    Hi, I got a multimeter with a frequency setting, and also have a car
    timing light with a detachable coil pickup.
    I want to be able to read rpms from small 2 stroke engines and I was
    thinking in using the coil pickup with a zenner diode.
    The multimeter needs from 200 mv rms up to 10v rms to read properly
    I remember that the timing lamps work this way: the signal from the
    pickup is transformed to a pulse that is feed to a scr that pulses the
    light. Could I connect the MM at the input of the SCR?
  2. As long as you leave the lamp in place, you can get the pulses from the
    lamp-SCR connection. Nevertheless you'd better take some precautions to make
    sure to keep the pulses always below the 10V you mention. The pulses may
    contain some nasty spikes that do not harm the lamp but your multimeter will
    not like them.

    petrus bitbyter
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