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Re: 12v tach on 6v system

To: ddahlgren@snet.net, todd <todd@twinjugs.com>
Subject: Re: 12v tach on 6v system
From: "todd" <todd@twinjugs.com>
Date: Fri, 4 Apr 2003 08:14:53 -0500
Dave Dahlgren wrote
> A relay will never be fast enough. 
*I questioned this also... thank you

> A transistor would be though. 
*Now there's a thought... would you happen to have a specific transistor in 
mind to try?

> If this is a points type system that will be off the negitive side of 
> the coil then the flyback from the coil will be more than enough to 
> trigger it. Have you tried hooking up the tach to 6 volts and seeing 
> if it works yet? I doubt if it would hurt it in any way. It will 
> just be a 12 volt system with a low battery. Dave
*Yes have hooked it up and what it does is literally kill the motor(i'm 
guessing the draw is too much for the 6v coil?). I hooked it up fully 
figuring it would work and thought my only issue would be that it would have 
an incorrect reading since most electronic tachs are built for 2 or more 
cyl's.
It's a points system and will be no problem on one bike as it will be changed 
to electronic and 12v eventually, but have another one that will stay as is 
and in production class. I would like to add a certain tach that's only 
available in 12v and am using this one to test with. Also would be willing to 
run an electrical 6v tach if I could find one(found one from a porsche but 
only goes to 5,500rpm). If anyone knows of one that goes over 8,000rpms 
please let me know?

Thanks for the response Dave... intrigued about the transitor?
Todd Dross

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