mad_max Posted April 11, 2012 Share Posted April 11, 2012 Im making a homemade rev limiter (like bee*r limiter hopfully) Ive sorted everything and just went to test it to find out i dont even know how to wire up a tacho Ive got green, black, white and red. My thoughts were black - ground, red - battery, white - light (tested that), and green - coil. But i dont have a clue.haha Any help appreciated. Quote Link to comment Share on other sites More sharing options...
mad_max Posted April 11, 2012 Author Share Posted April 11, 2012 Tacho is a speco meter Quote Link to comment Share on other sites More sharing options...
KKtrips Posted April 11, 2012 Share Posted April 11, 2012 My thoughts were black - ground, red - battery, white - light (tested that), and green coil negative.Nail, Head, Hit Quote Link to comment Share on other sites More sharing options...
mad_max Posted April 11, 2012 Author Share Posted April 11, 2012 Oh man im good. would the red go to ignition? or put white to ignition and red straight to battery? Quote Link to comment Share on other sites More sharing options...
KKtrips Posted April 11, 2012 Share Posted April 11, 2012 white goes to the park light circuit red goes to switched ignition Quote Link to comment Share on other sites More sharing options...
BlownCorona Posted April 11, 2012 Share Posted April 11, 2012 white goes to the park light circuitred goes to switched ignition if you can even be fucked, ive always wired my gauges so the back lights are always on, Quote Link to comment Share on other sites More sharing options...
Ned Posted April 11, 2012 Share Posted April 11, 2012 You are making a rev limiter? How? And how can you design a rev limiter and not know how to hook up the tacho, or at least find out by measuring the wires/opening it up? (wow, that came out demeaning.. Don't mean it that way) Or is it just a "here's a PCB and some parts, solder it yourself" dealio? Quote Link to comment Share on other sites More sharing options...
mad_max Posted April 11, 2012 Author Share Posted April 11, 2012 Haha, I was by computer and tacho was at my mates place. Just saw it online and thought id give it a crack. Its simple as hell. Testing on a mates fucked demo derby car with no exhaust so ill take a video of it. Ill put up a thread how to make it if it works Quote Link to comment Share on other sites More sharing options...
Ned Posted April 11, 2012 Share Posted April 11, 2012 But you're designing it yourself? I got part way through designing one and never finished it (like all my other projects :/ ) and i do electronic engineering/software engineering for a living. Let me know if you want/need a hand or want to run some ideas past someone? another clever cookie is slacker.cam if you have any HW related questions etc You going to use a micro for the smarts or do it all with logic and various ICs? Quote Link to comment Share on other sites More sharing options...
KKtrips Posted April 11, 2012 Share Posted April 11, 2012 Its being done with a rev counter with a shift light output and a relay. Quote Link to comment Share on other sites More sharing options...
Ned Posted April 11, 2012 Share Posted April 11, 2012 I know you can do them that way as well, but i was wondering how he's doing his. Or do you know that he's doing his tha tway? Quote Link to comment Share on other sites More sharing options...
KKtrips Posted April 11, 2012 Share Posted April 11, 2012 Yeah I know he is doing it that way - he bought it up in a previous tech thread. viewtopic.php?f=2&t=33077&p=819840#p819840 Quote Link to comment Share on other sites More sharing options...
mad_max Posted April 11, 2012 Author Share Posted April 11, 2012 Yea im doing it like that, Just tried before and no cigar. I think its the light not giving the relay enough power to activate it. Its a cheap shit tacho with a shift light which is pathetic. Back to the drawing board. Gotta amp up the light current somehow Quote Link to comment Share on other sites More sharing options...
Ned Posted April 11, 2012 Share Posted April 11, 2012 Drive the base of a decent transistor with a reasonably valued resistor and use that to drive the coil of the relay. Amplifier done Quote Link to comment Share on other sites More sharing options...
BlownCorona Posted April 11, 2012 Share Posted April 11, 2012 use weak output to trigger a small relay, that will connect big relay to batter? or like ned said, transistors are magic Edit: 2 relays would proably add too much lag to the whole system, now that i think about it, so neds soloution is best Quote Link to comment Share on other sites More sharing options...
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