Question about Small Bear's Dual concentric pots

[acehobojoe]

http://smallbear-electronics.mybigcommerce.com/alpha-dual-gang-9mm-pc-mount-dual-concentric/

Found this, and it looks intriguing! I really want to try to use it for a dual gain knob on a pedal! my only issue is that I need about 500k of resistance and these only go up to about 100k.

Is there a way to cheat and use resistors to create a pot like that or some other method?

I could try to modify the op amp circuit to fit 100k. It's a basic op amp circuit with the two resistors working together to increase gain. (See TS-9)

[armdnrdy]

Why don't you punch in dual concentric 500K pot into google

[MrBinns]

you can change out the wafer. It's a pain in the butt though.

If you want to spend the $10 and tear stuff apart this will help: http://imgur.com/gallery/i0UNI

[acehobojoe]

Haha oh boy. Looks like I'll be tearing them apart.

Yea, I've done some googling, this part is basically obsolete.

[armdnrdy]

If it doesn't have to be the right angle PC mount type...

http://www.ebay.com/itm/TOG-DUAL-CONCENTRIC-POT-A500K-AUDIO-STACKED-POT-NEW-MADE-IN-KOREA-/361032713153?pt=LH_DefaultDomain_0&hash=item540f3a03c1

[acehobojoe]

I might buy all those. I hope he has more than 46 of them

[PRR]

If it is op-amp, re-scale all the gain-set resistors to suit the pot you can get.

I always found dual (not ganged) concentric to be a real pain to fine-set. 90% of the time I'd rather spend more panel-space and have two knobs.

[mth5044]

I always found dual (not ganged) concentric to be a real pain to fine-set. 90% of the time I'd rather spend more panel-space and have two knobs.

This.

Although Midwayfair's tap Cardinal looks like fun.

[acehobojoe]

Interesting PRR. I'll have to get one and test it. They must get stuck together?

[Luke51411]

I might buy all those. I hope he has more than 46 of them

I'll be eagerly awaiting the build report on an effect that takes 47 500k concentric pots 

[acehobojoe]

I was actually going to try my first "run" of larger quantities. I hope it goes well. I talked to some distributors 

[MrBinns]

If you need 47 of them don't tear them apart to modify them that would take way to long. I'd see if you can scale you pots differently like PRR said.