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Projects => General Questions => Topic started by: cajone5 on August 29, 2016, 03:27:23 PM

Title: Simple mini 2.1mm power jack question
Post by: cajone5 on August 29, 2016, 03:27:23 PM
For standard center negative, which tab do I wire to ground and which gets the hot wire?  I am assuming the long tab is power and short is ground but want to confirm.

http://www.mammothelectronics.com/DC-Power-Jack-p/600-1004.htm

Thanks!
Title: Re: Simple mini 2.1mm power jack question
Post by: m-Kresol on August 29, 2016, 03:39:06 PM
use a multimeter on continuity setting to check! With the lumberg ones I use (they look alike) the long tab is the outer ring and the short one the centre pin. but make sure! you don't want to invert power
Title: Re: Simple mini 2.1mm power jack question
Post by: dbp512 on August 29, 2016, 03:47:00 PM
Even though I use the same jack on all my pedals, I always solder the wire to it, then check with my multimeter. Who knows if I'm distracted, tired, or just not thinking and accidentally solder it in backwards. If I do, I wouldn't think to check that when it doesn't work, and I don't want to risk burning something else up (I hate desoldering).
Title: Re: Simple mini 2.1mm power jack question
Post by: chromesphere on August 30, 2016, 02:30:20 AM
Long positive and short negative.  If you ever need to check, do what i do, flick through the 7 min fuzz build doc, its on page 6 :)

http://www.diyguitarpedals.com.au/shop/boms/7_Min_Fuzz.pdf

Paul
Title: Re: Simple mini 2.1mm power jack question
Post by: alanp on August 30, 2016, 04:34:59 AM
This might sound stupid, but I always refer back to Juansolo's internal photo of his ZPSDX pedal for gnd/+9V tab on those jacks :)
Title: Re: Simple mini 2.1mm power jack question
Post by: flanagan0718 on August 30, 2016, 04:39:06 AM
I use the same 2 DC jacks on all of my builds. I have never assumed I have the right lug for my 9v. I usually end up plugging in my 9v supply to the unwired Jack then testing it with my DMM.


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