Short finder

**vinceroger69** · 06-18-2022, 06:30 AM

Another great video looks a good bit of test equiptment too have
https://www.youtube.com/watch?v=0eixDdCpiO4

**eccerr0r** · 06-18-2022, 08:42 PM

Just need a voltage limited 1A CC PSU (LM317?) and you can read "ohms" (which would be milliohms) directly on your 200mV scale, if you have 20mV, even better.

Trick is not to have to send 1A through your circuit... could get toasty, but if it's a short, you probably don't really care anyway...

**redwire** · 06-18-2022, 10:39 PM

I think you'd need the compliance voltage-limited to say 0.2V to not damage anything. That pretty much rules out the LM317, have to use an op-amp and power transistor.
I also do well with a good bench multimeter reading uV, using lower currents. You inject a current and can follow the voltage drop to the high current short. Or use a thermal imaging camera.

**vinceroger69** · 06-19-2022, 06:48 AM

https://www.youtube.com/watch?v=gKaxNP24wdY

**clearchris** · Yesterday, 12:05 PM

I have been waiting for this to become available, but I admit, I'm starting to lose faith.

https://www.eevblog.com/forum/testge...with-display)/

**stj** · Yesterday, 07:12 PM

i already got the parts

**CapLeaker** · Yesterday, 07:51 PM

Looks like a similar idea to the Leakseeker 89, just with a display instead of a row of LEDs and sound.

06-18-2022, 06:30 AM	#1
vinceroger69 Badcaps Veteran Join Date: Mar 2012 City & State: Nuneaton Warwickshire My Country: uk I'm a: Hobbyist Tech Posts: 6,394	Short finder Another great video looks a good bit of test equiptment too have https://www.youtube.com/watch?v=0eixDdCpiO4

06-18-2022, 08:42 PM	#2
eccerr0r Solder Sloth Join Date: Nov 2012 City & State: CO My Country: USA Line Voltage: 120VAC 60Hz I'm a: Hobbyist Tech Posts: 7,152	Re: Short finder Just need a voltage limited 1A CC PSU (LM317?) and you can read "ohms" (which would be milliohms) directly on your 200mV scale, if you have 20mV, even better. Trick is not to have to send 1A through your circuit... could get toasty, but if it's a short, you probably don't really care anyway...

06-18-2022, 10:39 PM	#3
redwire Badcaps Veteran Join Date: Dec 2010 City & State: Alberta My Country: Canada Posts: 2,523	Re: Short finder I think you'd need the compliance voltage-limited to say 0.2V to not damage anything. That pretty much rules out the LM317, have to use an op-amp and power transistor. I also do well with a good bench multimeter reading uV, using lower currents. You inject a current and can follow the voltage drop to the high current short. Or use a thermal imaging camera.

06-19-2022, 06:48 AM	#4
vinceroger69 Badcaps Veteran Join Date: Mar 2012 City & State: Nuneaton Warwickshire My Country: uk I'm a: Hobbyist Tech Posts: 6,394	Re: Short finder https://www.youtube.com/watch?v=gKaxNP24wdY

Yesterday, 12:05 PM	#5
clearchris Badcaps Veteran Join Date: Dec 2013 City & State: San Antonio My Country: United States Line Voltage: 120v 60hz / 240v 60hz I'm a: Hardcore Geek Posts: 587	Re: Short finder I have been waiting for this to become available, but I admit, I'm starting to lose faith. https://www.eevblog.com/forum/testge...with-display)/

Yesterday, 07:12 PM	#6
stj Great Sage 齊天大聖 Join Date: Dec 2009 City & State: Europe My Country: some shithole run by Israeli agents I'm a: Professional Tech Posts: 26,621	Re: Short finder i already got the parts

Yesterday, 07:51 PM	#7
CapLeaker Leaking Member Join Date: Dec 2014 City & State: Atlantic Canada My Country: Canada Line Voltage: Ground, 0Hz I'm a: Hobbyist Tech Posts: 5,150	Re: Short finder Looks like a similar idea to the Leakseeker 89, just with a display instead of a row of LEDs and sound.

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