mix resistor values...

[List, Christopher]

Harry's right.

This is a perfect opportunity to plug my "PotGraph" Java applet that graphs
the transfer that occurs for using different resistor values with different
pot values. You can find it here:
http://www.mindspring.com/~clist/PotGraph.html

- It's not the most robust piece of software I've ever written, but it's
cool to check out "what ifs" with it. You might want one row of pots with
the pseudo-log curve you get from a low pot + high resistor combination...

For my seq. I used 100K pots with 1Meg resistors. I never had (or noticed) a
problem with noise - but then I have no facility for muxing in external
audio to one of the rows, I only using it for generating CV's. I wanted 100k
pots so I wouldn't need to worry about the current needed to drive the whole
column of pots (as Harry mentions).

- CList

> -----Original Message-----
> From:	Harry Bissell [SMTP:harrybissell at prodigy.net]
> Sent:	Wednesday, August 11, 1999 3:48 AM
> To:	Chris Crosskey
> Cc:	synth-diy
> Subject:	Re: mix resistor values...
> 
> No doubt: Use the 10K pots with 100K summing resistors. The other way the
> summing resistors will severely load the pots and they won't be linear
> anymore... Someone said 50K is better... maybe right. 10K may load the
> circuit
> too much... but use the lowest value pot that you can without exceeding
> current
> limits for best S/N ratio.  :^) Harry
> 
> Chris Crosskey wrote:
> 
> > My question is....the CV's need to be mixed together (each of the eight
> > steps per channel) and I was wondering...woulfd I be better off with 10k
> > pots and 100k mix resistors into the amp or vice versa (ie 100K pots and
> > 10k resistors)?...Thanks for any advice....
>