ok so i went out and bought a new pot just to drop in in case the pot
i had was bad. seemed it was. i dropped it in and still its scratchy.
is it possible that i am wiring the legs of the pot up wrong? whilst
trawling the message archives i noted that ken advises that the third
leg of the pot is not connected hence i havent grounded it.
i was about to try peng's suggestions but then i realised i have
nothing connected to the +6v pad.
i run the ground to the frequency pot then run the ground across to
some perfboard where ive tied in the grounds of the input output and
volume pot. the 6v connector isnt used at all!
i had was bad. seemed it was. i dropped it in and still its scratchy.
is it possible that i am wiring the legs of the pot up wrong? whilst
trawling the message archives i noted that ken advises that the third
leg of the pot is not connected hence i havent grounded it.
i was about to try peng's suggestions but then i realised i have
nothing connected to the +6v pad.
i run the ground to the frequency pot then run the ground across to
some perfboard where ive tied in the grounds of the input output and
volume pot. the 6v connector isnt used at all!
--- In cgs_synth@yahoogroups.com, "peng3002" <peng3002@y...> wrote:
>
> 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
>
>
> --- 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/>