AntonUK
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| posted on 6/5/14 at 09:36 PM |
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Testing a Tacho
Does anyone have a method or circuit diagram to allow the testing of a Tacho on the bench i.e. without an engine?
I've found a few 555 based circuits but all are 5v outputs
Build Photos Here
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theprisioner
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| posted on 7/5/14 at 10:15 AM |
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555 Timers will work up to 16V
see:https://www.fairchildsemi.com/ds/LM/LM555.pdf
It would be a very good way of checking it out.
http://sylvabuild.blogspot.com/
http://austin7special.blogspot.co.uk/
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SPYDER
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| posted on 7/5/14 at 01:52 PM |
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I recently calibrated an old tacho using the 12v output from an old battery charger. I tapped the transformer output before the rectifier. The 50hz
signal equated to 1500 revs. The tacho was a Cortina Mk2 item which senses pulses in the 12v coil feed wire. The technique may not work for a modern
unit. Might be harmful even. But it might work??
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AntonUK
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| posted on 7/5/14 at 06:00 PM |
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Technically that would shove a sine wave to it... might work tho...
I have a 555 timer circuit to try later, if that fails i'll attack the battery charger.
Build Photos Here
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