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Lm2917-Lm3914 tachometer schematic

Discussion in 'Electronic Projects Design/Ideas/Reviews' started by caslor, Apr 17, 2010.

  1. caslor

    caslor Member

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    My mistake not telling that is not exactly the schematic for my application... this is one i find from the net and want to see if this is the right connection for 20 leds in bar mode...

    in my project as it is a car... will be 12v supply to a lm7808 and then to the lm3914
     
  2. WildSwan

    WildSwan New Member

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    This is great! How about wiring it to be used in a single cylinder motorcycle?
     
  3. d_6789

    d_6789 New Member

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    I need help 20 band spectrum analyzer ! thank!
     
  4. dave

    Dave New Member

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  5. ami salleh

    ami salleh New Member

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    hi,i just wanna ask you something..what kind of diode you use?is it IN4001?or IN 4148?thank...nice project...
     
  6. audioguru

    audioguru Well-Known Member Most Helpful Member

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    A 1N4148 (or 1N914) are signal diodes that work well at the many frequencies and low currents of a tachometer and should be used.
    A 1N4001 is a very slow rectifier designed to work at only 50Hz and 60Hz but it might work in a low speed tachometer circuit.
     
  7. ami salleh

    ami salleh New Member

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    thanks for that quick answer...
     

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