mix resistor values...

[Harry Bissell]

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:

> HI Folks...
> I'm in the finishing stretch of designing a little sequencer thingy....It's
> got 8 steps (I'll be working on a 16-step driver sometime soon I guess) and
> I've done most of the layout. I've tried to keep panel wiring to a minimum,
> can't avoid it for the LED's on each step I guess (there are two tricolours
> on each step) so each step has it's own daughter board that is held to teh
> panel by its pots. Each step has four pots for the CV channels (four off
> natch :-)) and a pair of push switches to control gates one and two to
> switch them in or out for that step. The LED's light up green for a gate
> that is switched in, and the current step position is indicated by the
> LED's lighting up RED..a gate that is both switched in and the current step
> position is orange...I liked it and I had a bunch of tricolours sitting
> around so WTH....Each step has an individual gate output and there'll also
> be a one pulse per step gate output with a variable gate length too...so
> four gate channels and four CV channels...
>
> 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....
>
> BTW...my Atari Falcon has just had the first Eclipse graphics card sold in
> Europe (apparently) fitted into it....It's a 4Mb ATI Rage PCI unit with a
> PCI adapter to plug into the Falcon...I'm now cheerfully running in
> 1280x1024 (natural highest rez of a Falcon is only 640x480)...Suddenly my
> PCB cad package no longer needs me zooming in and out all the time cos I
> can display a 160x100mm Eurocard on screen with a 1/20" grid turned on and
> see everything at once....I used to have to do a 200% ZOOM to see 1/20" and
> as it is the sensible grid for homebuilding PCB's to I habitually use
> it....It really speeds up layout cos I can always see all the
> board.....yeehah :-))
>    Now I'm just waiting for the Tempest 200MHz/256Mb PPC accelerator and
> the promised cable modem/ADSL board (the PCI converter can handle more than
> one board at a time....high-speed comms is promised as soon as  BT and the
> other companies get their fingers out...Tempest due late this year....
>
> chrisc