[sdiy] Question on pot substitution

[Scott Bernardi]

I've got a page on pot substitution. See
http://members.home.net/sbernardi/elec/og2/partsub_pots.html.
125K should work fine in a circuit calling for 100K.
There are loading effects - if you have a typical 100K input resistance for
a CV input, it will load down a 100K pot and warp the response (you can
actually simulate a log pot with a linear pot by doing this on purpose).
Generally you want the pot value to be about 1/10 the load resistance to
avoid this (i.e., a 10K).
Chris List has a neat Java applet that graphs the effect of pot loading at
http://www.mindspring.com/~clist/PotGraph.html.

TooManySynths wrote:

> Hi All,
>
> I am building/converting several projects for modular
> use and I have a question regarding pot values.
> Almost all schematics call for 100k linear pots on the
> cv inputs.  I have a boatload of 125k linear pots and
> was hoping to use them.  Specifically, how will this
> affect performance of cv inputs.
>
> Thanks
> Daryl
>
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--
Scott Bernardi
sbernardi at home.net