Tacho Driver RPM
Discussion
Trigger wheels do a coil based taco driver, for use with a 5v ecu signal
see bottom of page.
http://trigger-wheels.com/store/contents/en-uk/d35...
Anyone know if this would work with a wedge rev counter, as be handy for anyone with an after market ECU, or megajolt system.
see bottom of page.
http://trigger-wheels.com/store/contents/en-uk/d35...
Anyone know if this would work with a wedge rev counter, as be handy for anyone with an after market ECU, or megajolt system.
I had a quick look and it's very hard to tell as all you can see is a couple of wires and a lump heat-shrinked together.
I guess the idea is that there's a small inductor in there which pretends to be the coil which gives enough of a spike to kick our old-skool tacho circuitry. You could get one mail order and by the "distance selling" act of whenever you have 14 days to return it for a full refund. Might be worth a try.
I guess the idea is that there's a small inductor in there which pretends to be the coil which gives enough of a spike to kick our old-skool tacho circuitry. You could get one mail order and by the "distance selling" act of whenever you have 14 days to return it for a full refund. Might be worth a try.
I converted a couple of current triggered ones (old Smiths) to voltage by using a simple monostable circuit with a 555 timer chip when changing to electronic/contactless ignitions.
The circuit isn't that complicated (for a needle that is) so if you fancy trying some home electronics, it's available on web.
Calibration is a bit of a guess though....
The circuit isn't that complicated (for a needle that is) so if you fancy trying some home electronics, it's available on web.
Calibration is a bit of a guess though....
Some of the tacho's (SW for definate) are wired in line with the 12v supply to coil and have a transformer that converts current pulses to voltage pulses which after I'd converted to coil packs no longer worked.
I took the tacho apart and pretty much bypassed the transformer and added a transorb and a series resistor to prevent spikes damaging the Frequency to voltage chip and then used 4 diodes (one from each coil -ve) to collect the pulses from each coil pack. It's a bit out of calibration but it works... I have some pictures somewhere.
I took the tacho apart and pretty much bypassed the transformer and added a transorb and a series resistor to prevent spikes damaging the Frequency to voltage chip and then used 4 diodes (one from each coil -ve) to collect the pulses from each coil pack. It's a bit out of calibration but it works... I have some pictures somewhere.
B@man said:
Some of the tacho's (SW for definate) are wired in line with the 12v supply to coil and have a transformer that converts current pulses to voltage pulses which after I'd converted to coil packs no longer worked.
I took the tacho apart and pretty much bypassed the transformer and added a transorb and a series resistor to prevent spikes damaging the Frequency to voltage chip and then used 4 diodes (one from each coil -ve) to collect the pulses from each coil pack. It's a bit out of calibration but it works... I have some pictures somewhere.
Be cool for some more info and pictures and diagrams, esp as a few people are convertingI took the tacho apart and pretty much bypassed the transformer and added a transorb and a series resistor to prevent spikes damaging the Frequency to voltage chip and then used 4 diodes (one from each coil -ve) to collect the pulses from each coil pack. It's a bit out of calibration but it works... I have some pictures somewhere.
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