What kind of 4-pin volumer controllor is this ? Or is it broke

[lordvader88]

I have a volume knob off a panasonic stereo, it has 4 terminals, looks like a pot, however its the type the turns forever in both directions. 2 pins are on the same PCB trace. AS I try to measure the resistance , is either open, or shorted, for every degree of turning basically. And it must have cap in it too, because if its not open or short when I stop turning it, it will be about 4-5 ohms, and start dropping down to zero.

So what is it ?

[Benta]

It's a rotary encoder. Most likely quadrature output. The volume control itself is somewhere else, digitally controlled from the encoder.

[lordvader88]

ok nice...