Desmopower
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I had my Smiths electronic rev counter installed by an auto electrician and he put a diode on the power supply wire, rock steady needle at all revs.
Electronic Smiths instruments
- Thread starter Sergio
- Start date
I have a Daytona Velona combined speedo/tacho on the 750. The tacho read erratically until I put a resistor in series in the trigger wire. Worked perfectly to stop the signal noise from affecting the tacho.
Andy
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Thanks for all the replies on my tach.When you say “trigger wire “,is that the wire coming from the coil? Also what does a diode do in laymen’s terms.Does it just let the current go one way?
Mike
This all gets confusing.Signal filters,resistors.diodes.
Mike
This all gets confusing.Signal filters,resistors.diodes.
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batrider
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Mike - I have a bunch of 4000 and 5400 series diodes which would work. I can just send you a few. Not sure how they help without knowing more about the trigger signal. It would eliminate any reverse polarity spikes.
On my bike there was a ton of noise on the 12V power wires which I think was being radiated from the plug wires. I used spiral wound inductive wires for the plugs which helped a lot. (I blew up 2 voltage monitor units before this.)
Russ
On my bike there was a ton of noise on the 12V power wires which I think was being radiated from the plug wires. I used spiral wound inductive wires for the plugs which helped a lot. (I blew up 2 voltage monitor units before this.)
Russ
jimbo
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1N4007 diode recommended by Peter Wilkinson,Caerbont Automotive Instruments Ltd. they sell the e tachs
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Thanks Jim,
Do I wire this diode into the wire from the coil to the tach? I am glad you got a reply from Peter as I haven’t had any response from him with other questions.
Mike
jimbo
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a diode in line with the trigger wire , diode in line with the red/blue wire
Looking back, I see it was a 1 megaohm resistor I put in the trigger wire for my Daytona.
Initially I contacted the (excellent) uk distributor who looped in the aftersales at Daytona Japan.
YMMV!
Andy
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Jim,
Thanks for the info.Am I correct in thinking a diode just lets the current flow one way.If so,is there a correct way to wire it into that wire?Sorry for my ignorance on this. I am good at wiring but not at understanding various components and how they work.
Mike
