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2006-04-05 by jure zitnik
2006-04-05 by Atom Smasher
> hello, i'd just like to ask how much difference would it make if i used===============
> 47k pots instead of 50k ones? 50k pots are quite difficult to get here.
> maybe if i wire a resistor in serial?
2006-04-06 by jure zitnik
On 4/5/06, Atom Smasher <atom@...> wrote:
>
> On Wed, 5 Apr 2006, jure zitnik wrote:
>
> > hello, i'd just like to ask how much difference would it make if i used
> > 47k pots instead of 50k ones? 50k pots are quite difficult to get here.
> > maybe if i wire a resistor in serial?
> ===============
>
> 47K pots should be fine.
>
>
> --
> ...atom
>
> ________________________
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2006-04-06 by austeritygirlone
> then i was trying to make DCO->VCF modulation but i found out that the
> DCO outputs are offset by +5VDC or so... i kinda figured that out
> without an oscilloscope - just with a multimeter and
> wires->mixer->soundcard and trial and error. is that true? what's the
> easiest way to drop that signal down 5VDC? i think it can make quite a
> nice mod.
2006-04-06 by jure zitnik
On 4/6/06, austeritygirlone <ziggystar@...> wrote:
> I don't own an oscilloscope myself. But if the DCO outputs are offset
> by +5V, thus oscillating around +5V you can make a symmetrical signal,
> thus one that oscillates around +0V, simply by running it serially
> through a capacitor, removing the very low frequencies. Select it
> large enough to let all desired frequencies pass nicely. Then you
> could control the voltage range by a potentiometer. This would most
> probably be a nice mod. I'm not looking at the schematics, but since
> you now have two drivers for one input (VCF-Cutoff), you should
> connect them through a resistor or something, so that you don't create
> any short circuit.
>
> I'm new to this stuff, so please correct me if something is wrong. :)
>
>
> > then i was trying to make DCO->VCF modulation but i found out that the
> > DCO outputs are offset by +5VDC or so... i kinda figured that out
> > without an oscilloscope - just with a multimeter and
> > wires->mixer->soundcard and trial and error. is that true? what's the
> > easiest way to drop that signal down 5VDC? i think it can make quite a
> > nice mod.
>
>
>
>
>
>
> ________________________________
> YAHOO! GROUPS LINKS
>
>
> Visit your group "korgpolyex" on the web.
>
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2006-04-06 by austeritygirlone
> hehe i'm even more new to this stuff and i really don't understand how
> running AC signal through a cap eliminates the DC offset... shouldn't
> that eliminate the high frequencies (and thus the oscillation)?
>
> jure
2006-04-06 by jure zitnik
On 4/6/06, austeritygirlone <ziggystar@...> wrote:
> A cap can be considered as a frequency dependant resistor. High freqs
> can pass and low freqs can't.
>
> Have a look at this picture:
>
> http://www.elecdesign.com/Files/29/1478/Figure_01.gif
>
> The +5V offset can be considered a very, very low frequency (f->0).
>
> On the other hand you can construct a lp filter, by "shortening" the
> high frequencies through a cap. Then you have to take the signal from
> before the cap, because the low frequencies stay there.
>
>
> > hehe i'm even more new to this stuff and i really don't understand how
> > running AC signal through a cap eliminates the DC offset... shouldn't
> > that eliminate the high frequencies (and thus the oscillation)?
> >
> > jure
>
>
>
>
>
>
>
> ________________________________
> YAHOO! GROUPS LINKS
>
>
> Visit your group "korgpolyex" on the web.
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2006-04-06 by Atom Smasher
> hehe i'm even more new to this stuff and i really don't understand how======================
> running AC signal through a cap eliminates the DC offset... shouldn't
> that eliminate the high frequencies (and thus the oscillation)?
2006-04-06 by jure zitnik
On 4/6/06, Atom Smasher <atom@...> wrote:On Thu, 6 Apr 2006, jure zitnik wrote:
> hehe i'm even more new to this stuff and i really don't understand how
> running AC signal through a cap eliminates the DC offset... shouldn't
> that eliminate the high frequencies (and thus the oscillation)?======================
gimme a few weeks... if i don't post details about how to add this to a
moog slayer then start harassing me.
--
...atom
________________________
http://atom.smasher.org/
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2006-04-08 by Atom Smasher
> yeah i did it yesterday and it's fine. the only thing i'll change is to=================
> replace the resonance pot with a linear one. the lower half of resonance
> range has practically zero effect and at ~3 o'clock it jumps straight
> into self-oscillation. anyone using a linear pot for resonance?
> i also did the filter 2/4pole switch and i LOVE the 12db/oct response! i===================
> like it TONS better than the original 24db/oct! i really recommend that
> to everyone.
2006-04-08 by jure zitnik
On 4/8/06, Atom Smasher <atom@...> wrote:
>
> On Thu, 6 Apr 2006, jure zitnik wrote:
>
> > yeah i did it yesterday and it's fine. the only thing i'll change is to
> > replace the resonance pot with a linear one. the lower half of resonance
> > range has practically zero effect and at ~3 o'clock it jumps straight
> > into self-oscillation. anyone using a linear pot for resonance?
> =================
>
> try using different resonance settings in the DCF (parameter 42). you may
> want to change some settings after the mod to find the range of the knob
> that works best.
>
>
>
> > i also did the filter 2/4pole switch and i LOVE the 12db/oct response! i
> > like it TONS better than the original 24db/oct! i really recommend that
> > to everyone.
> ===================
>
> does that sound more like an oberheim?
>
>
> --
>
> ...atom
>
> ________________________
> http://atom.smasher.org/
> 762A 3B98 A3C3 96C9 C6B7 582A B88D 52E4 D9F5 7808
> -------------------------------------------------
>
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> -- Robert Bickford
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>
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