Easy DIY milli-ohm meter using your existing DMM

Easy to make mill-ohm meter that uses your existing DMM. This could be really helpful a shorted capacitor, MOSFET, other shorted component on a computer power rail. I discovered this circuit on another UA-cam channel ‪@richardlangner‬ . The brilliant thing about this circuit is that is uses a diode to limit the output voltage across the test probes to .7 volts and that make it CPU safe. So check out my video to see how well it works and then stop by ‪@richardlangner‬ to see exactly how it works and how to build it.

[@richardlangner]

I'm glad you benefitted from such a simple design and took the trouble to make a nice and simple demonstration in your video.
I have another video of how to make needle-sharp probes for these low resistance tests (made from sewing needles of course).
Thanks for he credits, and for pronouncing my name perfectly...
Richard Langner.

[@Snowsea-gs4wu]

Thanks for the video, I don’t think the meter was sensitive enough to reliably find the short. I would have been nice to see how you connected the circuit with the multimeter and the whole project for inspiration. Keep up the good work!

[@anounceofbrilliance]

Thanks for the comment. While this circuit is not a replacement for voltage injection to find a short, it still seems to help get in the general area and definately works as a millohm meter.

[@we-are-electric1445]

If you inject a voltage at a point at the circuit which normally is at the same voltage or higher (preferably inject at the output of a voltage regulator circuit) than the injected voltage you shouldn't damage components. Use a current limited supply and start low and work up. Only work on the board you think has the short. Remove expensive components like the CPU if socketed and you are worried about damaging with the injected voltage. Use a Paraffin candle to detect heat - less dangerous than alcohol and wont evaporate like alcohol at room temp.
There are a lot of these milli-Ohm measuring devices about but most people find themselves chasing their tail with them at some point. I am not saying don't use them as every tool in your armoury is worth having at some point but I would say to anyone - lower your expectations. If you have no or little experience in fault finding it will probably be next to useless.

[@mohmadfazal8443]

Very nicely explained
❤

[@badlaugh3047]

Very cool video!

[@newvoyeur]

Get 'pound of brilliance' by using Kelvin probes with op amp circuit.

[@grahambambrook313]

See the other video that Richard Langner metioned above. Well worth it!

[@dennismarkiet129]

Fake video you hide everything if measure a ,cap with my multi meter get the same results you got