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Advice for a Short circuit detector

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Greybeard:

--- Quote from: zanzeoo on January 05, 2023, 09:39:11 pm ---I thinking to buy or make a Short circuit  detector more simple or less expensive.

--- End quote ---

Maybe DIY is a way to go:

https://www.pa4tim.nl/?p=5339
https://www.edn.com/milliohm-squawker-great-at-finding-shorts-and-reverse-engineering-pcbs/
https://www.eevblog.com/forum/repair/diy-magnetic-probe-to-find-a-short/msg1329343/#msg1329343
https://web.archive.org/web/20060311135708/http://www.polarinstruments.com/manuals/service/Toneohm%20700%20and%20550%20Service%20manual.pdf

kripton2035:
you need 0.1mΩ resolution to find a short with enough spatial precision.
I assume you did but are you using a 4 wires probes ?
it's strange you don't find any differences with a milliohm meter.

807:
If you have an LM317 handy, then here's a cheap way of doing it...


artag:
I was looking for a Toneohm. There are some on ebay but they're expensive - £3-400.
But I've found a few Omnitest Hy Trak for 1/10 of that (eg https://www.ebay.co.uk/itm/225274209822).

They appear to do nominally the same thing : measure milliohms with a display and a tracking audio tone. Are they equivalent ? I've read  that Toneohm have some special technique for finding groundplane shorts but that might apply to only some models, and I don't know how good it is.

Miti:
How about this short finder project?
I have one from jdobry and the troubleshooting technicians love it.

https://www.eevblog.com/forum/testgear/finding-short-on-motherboards-with-a-shorty-(with-display)/

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