Alpha Pots

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Usually, as with this diagram, the middle pin is the wiper. An Ohmeter or any DMM will tell you for sure. 😉

circuit-N.jpg
 
If you are using it as a typical volume control, solder it up; if the volume increases when you rotate clockwise, you are done. If the volume increases when you rotate counterclockwise, flip the outer contacts.

As mentioned, just check with an ohmmeter from center contact to either end. One connection increases R when rotated clockwise, the other connection for pins 1 & 3 reduces R when Rotated clockwise.
 
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