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geekmacdaddy
 Post subject: Change Pot Taper
PostPosted: Wed Jan 22, 2020 12:58 pm 
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To the better minds than mine (not a minority)

I have a Dual Gang B100k (PC Mount) and want it to be C100K. Are the 2 resistor values between the wipers and a lug that do it?

Thanks
Geek

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jimilee
 Post subject: Re: Change Pot Taper
PostPosted: Wed Jan 22, 2020 1:42 pm 
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geekmacdaddy
 Post subject: Re: Change Pot Taper
PostPosted: Wed Jan 22, 2020 2:12 pm 
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jimilee wrote:
Google choked up, fell over and sank into the swamp when I asked.



That's the funniest thing I've heard all week. :mrgreen:

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duhvoodooman
 Post subject: Re: Change Pot Taper
PostPosted: Wed Jan 22, 2020 4:06 pm 
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geekmacdaddy wrote:
To the better minds than mine (not a minority)

I have a Dual Gang B100k (PC Mount) and want it to be C100K. Are the 2 resistor values between the wipers and a lug that do it?

Thanks
Geek

Hmm, I think I put together a spreadsheet to calculate those curves, based upon the value of the pot and the fixed resistor. The next challenge is to find it....

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duhvoodooman
 Post subject: Re: Change Pot Taper
PostPosted: Wed Jan 22, 2020 4:42 pm 
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One thing to keep in mind, Jeff--when you add a fixed resistor across one leg and the wiper of a linear pot, you will not only create a curved response, you will also reduce the maximum available resistance. For example, if you add a 1M resistor across a 100K pot, the maximum achievable resistance will be 91K. Reduce the fixed resistor to 220K and you get a deeper curve but the max. resistance is reduced to 69K.

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geekmacdaddy
 Post subject: Re: Change Pot Taper
PostPosted: Wed Jan 22, 2020 4:44 pm 
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duhvoodooman wrote:
One thing to keep in mind, Jeff--when you add a fixed resistor across one leg and the wiper of a linear pot, you will not only create a curved response, you will also reduce the maximum available resistance. For example, if you add a 1M resistor across a 100K pot, the maximum achievable resistance will be 91K. Reduce the fixed resistor to 220K and you get a deeper curve but the max. resistance is reduced to 69K.


Interesting indeed. Thanks Bob.

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jimilee
 Post subject: Re: Change Pot Taper
PostPosted: Wed Jan 22, 2020 6:41 pm 
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Wow, I’d be interested in that chart too, that’s fascinating and helpful.


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duhvoodooman
 Post subject: Re: Change Pot Taper
PostPosted: Wed Jan 22, 2020 7:38 pm 
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jimilee wrote:
Wow, I’d be interested in that chart too, that’s fascinating and helpful.

Well, it's not "a chart" because every different combination of pot and fixed resistor values generates a different set of curves. I'll need to dig out that old spreadsheet and re-familiarize myself with it, and I'll see what I can do to make it generally accessible.

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jimilee
 Post subject: Re: Change Pot Taper
PostPosted: Wed Jan 22, 2020 7:54 pm 
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duhvoodooman wrote:
jimilee wrote:
Wow, I’d be interested in that chart too, that’s fascinating and helpful.

Well, it's not "a chart" because every different combination of pot and fixed resistor values generates a different set of curves. I'll need to dig out that old spreadsheet and re-familiarize myself with it, and I'll see what I can do to make it generally accessible.
spreadsheet, chart.....tomato tomAto.


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duhvoodooman
 Post subject: Re: Change Pot Taper
PostPosted: Wed Jan 22, 2020 7:57 pm 
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jimilee wrote:
duhvoodooman wrote:
jimilee wrote:
Wow, I’d be interested in that chart too, that’s fascinating and helpful.

Well, it's not "a chart" because every different combination of pot and fixed resistor values generates a different set of curves. I'll need to dig out that old spreadsheet and re-familiarize myself with it, and I'll see what I can do to make it generally accessible.
spreadsheet, chart.....tomato tomAto.

More like apples & oranges to an old Excel hound like me! :wink:

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jimilee
 Post subject: Change Pot Taper
PostPosted: Wed Jan 22, 2020 7:59 pm 
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duhvoodooman wrote:
jimilee wrote:
duhvoodooman wrote:
Well, it's not "a chart" because every different combination of pot and fixed resistor values generates a different set of curves. I'll need to dig out that old spreadsheet and re-familiarize myself with it, and I'll see what I can do to make it generally accessible.
spreadsheet, chart.....tomato tomAto.

More like apples & oranges to an old Excel hound like me! :wink:


Right! I use excel at work almost all day everyday. I know I could learn so much from you, there are so many things it can do.


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CaptainPeyote
 Post subject: Re: Change Pot Taper
PostPosted: Thu Jan 23, 2020 9:23 am 
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oh, man - yeah, I've seen that document. It was super handy for making custom pots and adjusting tapers. Hope you find it! If so, maybe a sticky?

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CaptainPeyote
 Post subject: Re: Change Pot Taper
PostPosted: Thu Jan 23, 2020 9:24 am 
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how about this, in the meantime?

https://sites.google.com/site/garydaven ... onics/java

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Muad'zin wrote:
I want Pterodactyl sounds dammit, not a nice little analog sustain.
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jimilee
 Post subject: Re: Change Pot Taper
PostPosted: Thu Jan 23, 2020 10:37 am 
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Just what the captain ordered. Thanks!


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