[sdiy] Sequencer voltage pot question

[Theo]

A change from 50k to 20k probably won't matter.
The current through the pots will about double but
with 0.5mA for 10V over 20k this would hardly be a problem.
However your relative loading of the pots by the summing resistors halves.
As a result you might expect the response to be a tiny bit more ideal (read
linear).
Also no reason to make changes in this case

As a rule of thumb the current though the pot should be _atleast_ a factor
10 larger as the (maximum) wiper current.
This is to reduce the loading effect.
On the other hand you can use the same loading effect to "change" the law of
the pot.
For example a 100k lin pot (to GND) with a 10k loading resistor (to
[virtual] GDN) will give you a log response.

Theo


From: Peter Grenader <petergrenader at mksound.com>



> All,
>
> Question:  Let's say you have a sequencer that requires 50K lin pots for
its
> step/bank voltage pots.  Let's say you replace them all with 20K lin pots.
>
> What should I expect the operational effect of this change to be?
>
> If there is a change, could I compensate for this by changing the value of
> the summing resistors going from the wiper of these pots into the final
> summing amp?
>
> If so, what would the corrolation of those two changes be (X% change of
pots
> value requires Y% change of summing resistor value)?
>
> if X% = 20%
>
> Y% = ???
>
> Thanks in advance for this.
>
> Best,
>
> P
>
>
>