greg
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Electronic Tach Circuit Design
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Congrats on the little one
Girls are the worst. I have 5. My daughter was by far the worst. Bought several LM2917s today. Thinkin' on building one just for fun. Then testing it on my gauges.1981 GS750L (sold)
1981 GS750L (current)
1978 Yamaha RD400 (RD = Race Development)
1981 Honda CT70 (86+ MPG at WOT most of the time)
1983 GS1100GL (needs work: update, gone to a new home)
1956 Simplex (with a TS250 motor)
1985 GS1150E (Hammer Time!!)
1998 1200 Bandit (Rattler)
1980 GS1100L (Janice)
Do I continue?
"An unarmed man can only flee from evil, and evil is not overcome by fleeing from it." - Col Jeff Cooper
e tan, e epi tan
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nater
Originally posted by Tazman001 View PostGirls are the worst. I have 5. My daughter was by far the worst. Bought several LM2917s today. Thinkin' on building one just for fun. Then testing it on my gauges.
The prototype boards are probably still a couple weeks out, but once they're in and we get something working well I could do another batch of boards if people would like them.
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nater
Boards are finally in
I only ordered two of them for testing, but they threw in a third for some reason...I'm not complaining! Adding the components:
If you look closely you'll see that the main IC is not the LM2917...I left them in my bag at work, so it won't be until monday when I can get my hands on them. This is my stand-in for the pic
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UncleMike
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nater
Originally posted by UncleMike View PostCan't believe I missed this until now ...
Any updates?
I have a spare tach and one of the prototypes on my bench right now for some more testing, but work keeps sending me all over so I've only been able to work on it in fits and starts. If it turns out that the tach is actually current controlled like I am now suspecting, it is an easy change and I should be able to do a respin of the board for Greg to test. Its been a slow process but we're moving in the right direction
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UncleMike
Originally posted by nater View PostI was going to wait until I had some good news, but since you asked! Greg did some testing with a prototype on his bike...it seems to work around idle, but is more flaky the higher the revs go. The board is working as it was designed, but the problem is the tach needle itself has a non-linear voltage response. I made the (wrong) assumption that it was voltage controlled based on the datapoints you see in my first post.
I have a spare tach and one of the prototypes on my bench right now for some more testing, but work keeps sending me all over so I've only been able to work on it in fits and starts. If it turns out that the tach is actually current controlled like I am now suspecting, it is an easy change and I should be able to do a respin of the board for Greg to test. Its been a slow process but we're moving in the right direction
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Bugge3
Hi, I am new here, i have a GSX550 ES with the same problems and never got it to work right, until i found this: https://urevco.com/
And it fits perfectly ind the housing :-) https://www.youtube.com/watch?v=PRcWSNRRE9E
And tanks to Marco at Urevco for being very helpfull.
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