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Electronic Tach Circuit Design

  • Thread starter Thread starter nater
  • Start date Start date
UncleMike said:
Can't believe I missed this until now ...

Any updates?
Click to expand...

I 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 :rolleyes:
 
nater said:
I 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 :rolleyes:
Click to expand...

Nearly Greek to me, but very interesting! Glad you're still on it, and no rush. We've waited 30 years so far, after all.
 
the new board is in my bike now, and, as nate reports, is a no worky. but he is working on it! i'm excited to hopefully finally have a working tach. now i need to find some new turn signals...

greg
 
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