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Wrongly wired extension/volume control cable., Who said cables don't make a difference. ;)
uart
post Jul 5 2012, 07:51
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I just bought an inline volume control (1m mini-stereo extension cable with in-line pot) and the pot seems to be wired up in the reverse of what I expected.

It appears that the input to the pot (output from the player) is connected to the slider, while the output side (to the phones) is connected to the other side of the pot. (btw First side of the pot still common/ground of course.)

Is this what I'm thinking, someone just wired up a bunch of these backwards and hence why they're flogging them for $1 on ebay, or is there an actual reason that someone would do it this way.

This post has been edited by uart: Jul 5 2012, 08:04
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uart
post Jul 5 2012, 15:08
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Thanks for the info guys. Yes I was worried about this device presenting a short circuit to the driving device, but it may indeed have some minimum resistance in the slider circuit. I did a rough tests with an ohmmeter it didn't seem to go below about 8 ohms, so perhaps there is something there. (It actually goes to some minimum but then open circuits right at the end, presumably to completely disconnect the phones at the zero volume point).

Unfortunately I wanted this device specifically to increase the driving point impedance for a cheap mp3 player that has waaaay to smaller coupling capacitors to drive anything under a few hundred ohms. Anyway, I popped it apart and re-soldered it in about 5 minutes and now it works like a charm (just swapped around input and output wires btw). I can pretty easy get the driving point impedance up over 350 ohms and still get enough volume, so it's basically "fixed" an otherwise unusable mp3 player for me. smile.gif
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