even when grounding the pot like that it had no effect. ive picked up
a replacement and will try it out. what ive done is run the ground
wire to some stripboard (thats old and oxidised, hence i think its the
source of the humm, not taking solder joints well)then all ground
connections in and out of that.
i'll let you guys know how i go replacing the pot. also picked up a
linear pot for the level control. wont be able to get in front of the
iron until tomorrow ;)
a replacement and will try it out. what ive done is run the ground
wire to some stripboard (thats old and oxidised, hence i think its the
source of the humm, not taking solder joints well)then all ground
connections in and out of that.
i'll let you guys know how i go replacing the pot. also picked up a
linear pot for the level control. wont be able to get in front of the
iron until tomorrow ;)
--- 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/>