Announcement

Collapse
No announcement yet.

Electronic Tach Circuit Design

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

    #16
    congrats nate! they do grow up too fast! my boys are by far the best thing i have ever done!!!!

    greg
    1983 GS 1100 ESD :D

    Comment


      #17
      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

      Comment


        #18
        Originally posted by Tazman001 View Post
        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.
        lol she's been a handful so far, but I get to escape to work so I can't complain too much. If you're going to put the circuit together, just realize that the output is a function of the input voltage, so you need a steady source voltage to make sure everything is consistent. The components I used are for 8.2v and the zener/resistor voltage regulator on the input keeps everything steady. If you use something else, you'll just have to adjust the resistor and cap values to keep the same voltage slope as on the first page.

        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.

        Comment


          #19
          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

          Comment


            #20
            looks good to me! thanks nater!
            1983 GS 1100 ESD :D

            Comment


              #21
              Can't believe I missed this until now ...

              Any updates?

              Comment


                #22
                Originally posted by UncleMike View Post
                Can't believe I missed this until now ...

                Any updates?
                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

                Comment


                  #23
                  The tach is an ammeter.
                  De-stinking Penelope http://thegsresources.com/_forum/sho...d.php?t=179245

                  http://www.thegsresources.com/_forum...35#post1625535

                  Comment


                    #24
                    Originally posted by nater View Post
                    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
                    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.

                    Comment


                      #25
                      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
                      1983 GS 1100 ESD :D

                      Comment


                        #26
                        Originally posted by rustybronco View Post
                        The tach is an ammeter.
                        Yes, exactly my problem lol.

                        Comment


                          #27
                          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.

                          Comment

                          Working...
                          X