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Snowmobile Tach/Pulse Adapter

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drew.hinds10

New Member
I'm trying to add a tach to my 2000 Arctic Cat. It has a 370 2 stroke 2 cylinder. It requires a 4 pulse tach (which is extremely expensive). I have a 6 pulse and need to convert it with a universal pulse adaptor. What in : out ratio would I need to use? I'm not super familiar with pulses or tachs in general (I know the basics but that's it) so I'm not too great at deciphering this sheet.
 

ericgibbs

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Most Helpful Member
hi,
Are you saying that the Cat has 4 pulse Tacho output pulse rate and you want to convert the 4 pulses to 6, in order to drive a 6 pulse Tacho display.?

E
 

drew.hinds10

New Member
I believe it's an electrical pulse, Max rpm is 10,000. Can't get a picture of the tach right now. It hooks up off of the coil I believe.
 

drew.hinds10

New Member
Forgot to mention I have it hooked up right now without the adaptor in, it reads 500rpm when it should read about 3,000 (guessing off of sound)
 

ericgibbs

Well-Known Member
Most Helpful Member
hi,
If you don't have the facilities to program a PIC, this is one option using logic IC's.

It is a very basic circuit as you have not specified the required voltage levels or drive capability required for the pulses in and out.

One image shows the operation at 1000 pps and the other at 10,000 pps.

E

EDIT:

Forgot to mention I have it hooked up right now without the adaptor in, it reads 500rpm when it should read about 3,000 (guessing off of sound)
That's a difference of 6 times.?
Which does not match up with your original post.??
 

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ericgibbs

Well-Known Member
Most Helpful Member
hi 10,
If you decide that you want to build the device, let me know and I will post a more detailed/optimised circuit.
The circuit posted above gives a 2:3 ratio ie: 4 pulses in with 6 pulses out.
The method is the 4 pulses are doubled to produce 8 pulses, then the divider blocks 2 of these pulses, so the output is 6 pulses.

But I must know from you the input signal specification. ie: voltage levels from the 4 Tacho source
Also the output drive voltage/current required to drive the 6 Tacho.

E
 

Ian Rogers

User Extraordinaire
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If you decide to put a simple micro in series... I've set up a CCP module to capture 4 input pulses and send out 6 in the same time frame..

I too need to know the voltage and current required to drive the Tacho..
 
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