Memoriam for a friend

Discussion in 'The Projects Forum' started by Scarfoot, Jun 10, 2013.

  1. Scarfoot

    Thread Starter New Member

    Jun 10, 2013
    2
    0
    I have a friend who passed away. I wanted to make a little tribute to him for my bar. This would be the Tachometer from his bike mounted on the bar. I wanted it to light, and show a tach of between 1200 and 3000 rpm. I was hoping to run it off AC current. The problem is, I am not tech savy. It is my hope this would be a fairly simple project and someone here could guide me on it.

    Thanks in advance.
     
  2. Dodgydave

    Distinguished Member

    Jun 22, 2012
    4,963
    743
    So its a 12 Volt tacho then? if so 3000RPM is a 50Hz square wave signal to the sense pins,so 25Hz is 1500RPM. You can use a 555 timer as an oscillator, select the resistor /capacitor values to give out 20 to 100Hz.

    OR you could put a low voltage AC supply to the sense pins if its 50Hz = 3000RPM / 60Hz = 3600RPM
     
    Last edited: Jun 10, 2013
  3. Scarfoot

    Thread Starter New Member

    Jun 10, 2013
    2
    0
    It is indeed a 12 volt. There are four wires, red, yellow, green, and black. The black appears to be the ground wire. The safest way sounds like the low voltage AC supply.
     
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