Hold up before replacing the pot. I had a similar problem ith the Res
pot. It actually came from other pots/jacks not being grounded. Next
to the power supply header there is a "6V" hole on the pcb. Make sure
if your using this hole to run a ground line to pots/jacks to solder
a link to the ground trace right next to it. Cleared up my crackle
problems, maybe it'll work for you.
As far as output levels go...I took out the link and replaced it with
a 390K resistor.
As a side note: I think Ken says to breadboard first. This is great
advice. For instance: I built the pulse divider and it works
perfectly, but it puts out 13-15volts and I would have preferred
5volts. It's simply a matter of changing some resistors to get the
output level I want, but after everything is wired solder work can be
a little awkward.
Phil
pot. It actually came from other pots/jacks not being grounded. Next
to the power supply header there is a "6V" hole on the pcb. Make sure
if your using this hole to run a ground line to pots/jacks to solder
a link to the ground trace right next to it. Cleared up my crackle
problems, maybe it'll work for you.
As far as output levels go...I took out the link and replaced it with
a 390K resistor.
As a side note: I think Ken says to breadboard first. This is great
advice. For instance: I built the pulse divider and it works
perfectly, but it puts out 13-15volts and I would have preferred
5volts. It's simply a matter of changing some resistors to get the
output level I want, but after everything is wired solder work can be
a little awkward.
Phil
--- In cgs_synth@yahoogroups.com, "hiriseau" <sean@p...> wrote:
>
> thanks i will get another one pronto, its a sealed pot so nothing i
> can really do about it. and its only a couple of dollars to get a
new
> one.
>
> with the level, considering that i will be using the filter in a
tweak
> hard on the fly sort of role, would i be better off using the trim
pot
> to set the output level and then attenuator on the input, so that i
> don't kill any club sound systems and peoples ears?
>
> --- In cgs_synth@yahoogroups.com, sasami@h... wrote:
> > >the resonance pot is EXTREMELY crackly whenever i move it.
> >
> > That's a dud pot. It isn't a solder issue, but rather dust or
> "corrosion" on
> > the pot resistive strip. A shot of electrolube contact cleaner may
> help. A
> > better pot is the best solution.
> >
> > >secondly, levels. i have the link in and i have a 50k log pot in
(the
> > >same 9mm alpha) and it doesnt seem to be working too well. it is
low
> > >in volume then BANG heaps of volume. my suspicion is that i
should be
> > >using a linear pot instead of a log pot. this is what it sounds
like
> > >http://users.bigpond.net.au/xpander/level.mp3 would i be better
off
> > >using the pot as an attenuator on the input stage, and using a
trim
> > >pot on the level to tweak it to where i want?
> >
> > Yes, a linear pot would probably be better. In fact, I rarely use
> log pots
> > in synthesizers at all.
> >
> > Ken
> >
> >
______________________________________________________________________
_
> > Ken Stone sasami@h... or sasami@c...
> > Modular Synth PCBs for sale
<http://www.blaze.net.au/~sasami/synth/>
> > Australian Miniature Horses & Ponies
<http://www.blaze.net.au/~sasami/>