[sdiy] Endless Rotary Potentiometers

Roman Sowa modular at go2.pl
Wed May 7 10:13:15 CEST 2014

Get regular dual linear pot, the kind that has 2 tapers facing each 
other, separated with metal ring spacer, while between them there are 2 
rotating wipers. Remove the upper board, remove the stop so the shaft 
can freely rotate, and file the metal spacer a bit (1-2mm) on the 
oposite side where normally the leads would go. Then put the board with 
resistive track back to the pot, but rotated bu 180 degrees.
BTW, for the filing it's better to remove the metal spacer entirely, so 
pot does not get puluted with metal dust.

It's not pin for pin replacement, but cheap and quick, which is the core 
of DIY spirit. It took about 10 minutes to do it and priceless loads of fun.
I have actually did it yesterday, can you believe the coincidence?


W dniu 2014-05-06 22:36, Nathanael King pisze:
> Hi List,
> I'm having trouble finding proper search terms. I just purchased a
> bunk mpd24. Seller said "Values are jumping all over the place". I
> found 3 problematic pots. I would have thought they would be simple
> encoders - silly me. My reading suggests Akai used potentiometers that
> rotate a full 360 degrees. They are a 9mm size and standard footprint.
> Metal shaft, threaded bushing. There are 4 pins - one for each end and
> !2! wipers. People that sell them linked below.
> http://www.mpcstuff.com/1a0-09-0044.html
> http://www.vstservice.com/p-710-akai-mpd24-mpk-control-rotary-potentiometer.aspx
> I'm not interested in paying over $20 for 3 pots (call me crazy).
> Anyway, I thought I'd probe the list on the perchance someone has run
> across this before and has inside information. They are Alpha brand. I
> couldn't find a datasheet for these in the places I looked. Of course,
> Alpha will make anything you want in the right quantity, so I don't
> really expect much help from them.
> I have used de-oxit and come close to full functionality on some of
> the jumpy pots, but one isn't playing nice at all. So, yes, I'm trying
> to just clean it in the meantime. It appears someone spilled a sticky
> substance (beer) on the unit.
> Thanks,
> Nate
> Paper Products Music
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