[sdiy] Drone Synth

[Karl Dalen]

Low and behold, guess what i found out?
The Moog Liberation uses the 4046 in the poly section! :-)
(old news i suppose! )

So that makes three a machines that uses the 4046, PolyMoog
Liberation and the OSCar, the oscar uses them in a looked 
loop to count values out of ram so they are actually
used as oscillators, however not as VCOs altought! 

Reg
KD

 --- Scott Gravenhorst <music.maker at gte.net> skrev: > Steve Allen
<snd_audio at yahoo.com> wrote:
> >
> >Thanks Scott, I think I'll go with that idea, they can be vc'd too.
> 
> Well, I think a 4046 makes a crappy VCO, the internal charge current
> mirrors are like the mirrors
> in a carnival "funhouse".  That being said, you can voltage control it,
> but don't expect it to
> track either linear or expo control voltages.  Worse yet, I've tried,
> but was unable to supply an
> external charge current corrector to make it linear (or expo).  It could
> be that I misapplied
> Bjorn's technique, but then, I never got the entire story on his
> research of this.  He claimed to
> get something musically useful, but yanked his site off of the internet
> after some frackas here on
> SDIY.
>  
> If you're going to go voltage controlled, I think the 4069 (in dual VCO
> config) would be better,
> it's a dual and doesn't require the extra opamps to make sawtooth.
> 
> > Know where I can get that in an ASCII schematic??
> 
> You're kidding, right?
> 
> >Thanks again for your help.
> >  Steve
> >
> >Scott Gravenhorst <music.maker at gte.net> wrote:
> >"john mahoney" wrote:
> >>> ...but only square waves
> >>
> >>If I recall correctly, Scott Gravenhorst has used a PLL to generate
> saws =
> >>from squares. Would that be useful?
> >
> >Actually, this came from the beloved "Adolph Amin" AKA Bjorn
> Julin/Nillson.
> >I have a simplified schematic at:
> >
> >http://home1.gte.net/res0658s/electronics/4046PLL_saw_out.gif
> >
> >It's a dual input high impedance amplifier connected to each side of
> the
> >VCO cap. The outputs are summed and voila, out comes a sawtooth.
> >
> >I never got around to actually trying the waveshaper because I couldn't
> get
> >the VCO to behave linear enough for use in music. But the principal of
> >operation is not complex and there is no reason for it not to work.
> >
> >IMHO, the 4069 VCO is the best bet, and if you eliminate the PWM part,
> you
> >can make 2 VCOs from one chip package.
> >
> >
> >>He's also worked on some kind of divider for creating different =
> >>intervals from a master (high speed) oscillator.
> >>
> >>The above is from memory, perhaps Scott can add some details.
> >>--
> >>john
> >>
> >>
> >> ----- Original Message -----=20
> >> From: Steve Allen=20
> >>
> >>
> >>
> >> Hello All,
> >> I'm looking to build a module that will be used to generate a drone =
> >>tone to under current the main theme in a musical pieace. I've looked
> at =
> >>using 555 timer to CD4024 divider, a dozen of those would be cool, but
> =
> >>not very flexable once tuned up.
> >> How about CD4046 PLL's using the divider scheme, more flexable, but =
> >>only square waves. Hum....... A bank of Rene's CMOS VCO's ........ a =
> >>little complex but very useful.
> >> Any ideas? Hope I'm not being too vague or.... well, never mind. Any
> =
> >>and all ideas will be appreciated.
> >>
> >> Thanks,
> >> Steve
> >
> >========================================================= 
> >- Where merit is not rewarded, excellence fades.
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> >
> >-- Scott Gravenhorst | LegoManiac / Lego Trains / RIS 1.5
> >-- Linux Rex | RedWebMail by RedStarWare
> >-- FatMan: home1.gte.net/res0658s/FatMan/
> >-- NonFatMan: home1.gte.net/res0658s/electronics/
> >-- Autodidactic Master of Arcane and Hidden Knowledge.
> >
> >
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> =========================================================  
> - Where merit is not rewarded, excellence fades.
> - Hydrogen is pointless without solar.
> - What good are laws that only lawyers understand?
> - The media's credibility should always be questioned.
> - The only good terrorist is a dead terrorist.
> - Governments do nothing well, save collect taxes.
> 
> -- Scott Gravenhorst | LegoManiac / Lego Trains / RIS 1.5
> -- Linux Rex         | RedWebMail by RedStarWare
> -- FatMan: home1.gte.net/res0658s/FatMan/
> -- NonFatMan: home1.gte.net/res0658s/electronics/
> -- Autodidactic Master of Arcane and Hidden Knowledge.
>  

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