Memoriam for a friend

Thread Starter

Scarfoot

Joined Jun 10, 2013
2
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.
 

Dodgydave

Joined Jun 22, 2012
11,304
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
 
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Thread Starter

Scarfoot

Joined Jun 10, 2013
2
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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