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Looking for Linear pot with center tap and 4 pins
Looking for Linear pot with center tap and 4 pins
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Old 7th October 2019, 08:13 AM   #1
zgtc is online now zgtc  Europe
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Looking for Linear pot with center tap and 4 pins
Default Looking for Linear pot with center tap and 4 pins

Hi,

I'm looking for a linear pot with center tap, to use as a balance selector using Arduino and a digital potentiometer (WM8816 can set volume for L/R channels independently).

I have an old (broken) Rotel RA1000 amp balance pot, but it's logarithmic. It has 4 pins, one marks the center resistance, the other the resistance at each specific rotation angle. Same as this:

Click the image to open in full size.

I've seen some in ebay, but none with 4 pins. So my question is, do linear pot with center tap and 4 pins exist? I guess I would be able to use one with 3 pins, just by using the normal resistance value when the pot is rotated to the center tap and then using that value to calculate channel deviation when rotating.

Thank you

Thank you
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Old 7th October 2019, 08:35 AM   #2
blacklite is offline blacklite
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Why not use a rotary encoder and some code in the Arduino? Much simpler.
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Old 7th October 2019, 09:08 AM   #3
zgtc is online now zgtc  Europe
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Looking for Linear pot with center tap and 4 pins
Quote:
Originally Posted by blacklite View Post
Why not use a rotary encoder and some code in the Arduino? Much simpler.
yes, it'd be much easier, but I don't want
1. clicks (just the central one), nor
2. infinite rotation

thank you anyway for the idea
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Old 7th October 2019, 01:22 PM   #4
Mark Tillotson is offline Mark Tillotson
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Why not use a separate voltage divider for the centre-tap - functionally equivalent if you aren't passing any current to the wiper or centre tap? And lower noise as it can be metal film.
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