RPM meter

Discussion in 'The Projects Forum' started by onlyvinod56, Nov 30, 2008.

  1. onlyvinod56

    Thread Starter Active Member

    Oct 14, 2008
    362
    1
    hi
    can anybody help me in designing a digital tacho using ICL 7107, which displays the speed of the shaft on a 7 segment display unit.
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    The IC is a combined A to D converter which has a 4 1/2 digit display. That would make it an accurate voltmeter.

    As you have selected a device that requires a voltage input, how do you want to make a voltage from the shaft rotation? How much room do you have to attach some magnets or whatever else you might have in mind?
     
  3. onlyvinod56

    Thread Starter Active Member

    Oct 14, 2008
    362
    1

    i'll get the voltage with a f/v converter.
    can u provide me a schematic?
     
  4. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Try the data sheet for an LM2907. How do you want to make the frequency?
     
  5. Alberto

    Active Member

    Nov 7, 2008
    169
    36
    what you have in mind is not a digital tacho but an analog tacho! The result will be an useless device due to the big errors in reading the shaft rotation.

    Alberto
     
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