Technical > Wiring & Sensors

Need to reduce a 12v digital signal to 5v

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lugnuts:
I have a plug and play application that powers the secondary trigger with 12v in the harness.
I understand that the VEMS needs a max. of 5v signal or it will be damaged.
I'm just a dumb tuner, can someone show me how to reduce the 12v signal to 5v?
Thanks,Kevin

rob@vems.co.uk:
I'm not sure where you got the information that more than 5V would damage the VEMS, it will take a 12V signal as the input is protected by a Zener diode.
Have you measured the output of the Hall sensor?  We've not come across too many that put out a 12v, the VW ones tend to give about 4V

lugnuts:
Thats great news. In my first few weeks of research, I had a bad habit of not saving link locations, I'll have to dig-up that 5v comment.
I did not in fact measure it yet. While reviewing my manual diagrams it is showing that the 4 cyl cars share the 5v supply with the TPS, but the VR6 cars share a supply with other 12v components. I will verify this but it seems to not be an issue anyway.

I will delete the original post if you would like to avoid spreading misinformation.

Thanks,
Kevin

rob@vems.co.uk:
No need, I have a policy on non-deletion on here because removing stuff looks a bit iffy.
Plus its a datapoint that people who may have read the 5v remark can refer to now.

Cheers

Rob

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