Dualganged pots

[CodeMonk]

Wondering if you have ever done any of this before.
I have need for a special dual ganged pot.
One gang being 1k linear the other being 5k reverse audio.
I have seen some pots where this would be a simple change as each gang has the carbon (?) pad on a fiberglass type of plate. Seems to me I could just swap plates and be good to go.

Anyone tried this before?

Thanks

God I love this site

[snufkin]

i think they used to sell a system where by you cloud assemble your own by slotting them on to a common shaft or something

never actually seen them for sale like that

[axg20202]

I have done this for dual-concentric pots where I needed specific values that were not commercially available. I used CTS pots because they are well made and easy to take apart/put together. You should be able to do the same for a stereo dual-gang pot. Just buy some similar donors from the same manufacturer and swap the wafers around. Just be careful not to touch/damage the resistive strips in the process. It's a good idea to label the actual wafers (just above the solder tags) with their values before you start taking them apart to avoid any mixups.

[Renegadrian]

following the previous entries, would it then be possible to have a 100k/1M dual pot!?

[peterg]

See second point under "Tricks you can play" section.   http://www.geofex.com/article_folders/potsecrets/potscret.htm

[Renegadrian]

My idea is this: Carl martin plexitone, it has a switch for crunch and high gain with their respective pot. I'd like to have just one pot and switch it inside (a customer asked for this actually...)

[Fender3D]

following the previous entries, would it then be possible to have a 100k/1M dual pot!?

Definitely,
if you buy 1 dual 100K AND 1 dual 1M, just disassemble the pots, then use one upper trace from first pot and one lower trace from the second pot.
You'll have upper traces different (reversed) from lower traces.
You'll obtain one pot 100K/1M and the other 1M/100K, then it's just a matter of wiring...

[Renegadrian]

All right, I now have a 100k/1M linear pot - I had a dual 100kB and a single 1MB, I had to sacrifice the single (you cannot take out the wafer without destroying the plastic part that holds it and reassemble it with the other wafer) but easily succeded at it!

THX for the input! Grazie!

[Fender3D]

(you cannot take out the wafer without destroying the plastic part that holds it and reassemble it with the other wafer)

With Alpha pots, I use a small screwdriver and a hammer 
Lock pot's thread in a vice, then hammer the shaft from behind punching it with the screwdriver...

[joegagan]

if you have access to omeg 20mm, they are very easy to multigang, as long as you have one of their duals to begin with. unfortunately, omegs are not common in the US, but you can get them from numerous euro sites. i have 100klin  duals, , the rest are single -22klin, 220klin and 100klog, i know that isn't what you asked for, but just putting the info out there. i can sell from the stock i have if someone needs them.

[aion]

1. Buy a dual linear 1k pot: (this is the only one I could find... SBE doesn't sell them)
http://www.taydaelectronics.com/1k-ohm-linear-dual-taper-potentiometer.html

2. Buy a 5k audio single pot: (yes, audio taper on this one - it'll be reverse audio when we're done)
http://www.taydaelectronics.com/5k-ohm-logarithmic-taper-potentiometer-with-solder-lugs.html

3. Follow the steps on pg 3 of the documentation for the Boss SP-1 project:
http://aionelectronics.com/product/chroma-boss-sp1-spectrum-equalizer/

This only works if you can find a dual-gang pot in one of the two values you need, which is sometimes not possible. Tayda has a ton of duals, but I hate the knurled shaft and straight PCB mount pins, so I always check SBE first. But this will get the job done and the end result will be exactly what you're asking for.