freq. mult.

[danial stocks]

yes, PLLs that dont track properly can be GREAT!! I used a 4046 pll driving 
a sine osc tracking a theremin core that I made, seemed easier than stuffing 
around trying to get perfect sine o/p from simple diode RF mix I was using.. 
also then I could have a bass drone by switching dividers in.. anyway, to 
get the pll to track over the full freq range of the theremin req'd some 
trick working out of the filter.. in the end, I put a couple of pots in, 
tweak for best performance, then just sub in a fixed res.. well that was the 
idea... the odd warbles and growls and other weird sounds you could get with 
different settings of the pots as the freq was swept were a great new 
feature.. in the end I left the pots in!! the warbly growly sounds were 
great because they would interact with your hand movements.. really nice & 
interactive..
Cheers,
Dan

> >btw.: I didn't say  yesterday that plls won't track. I just wanted to 
>"damp" a
> >perhaps to optimistic vision of such a system.
>
>Absolutely agreed; a PLL will not ever track *perfectly* during input
>frequency change.  However, so often the PLL is mentioned here, but
>only it's negative aspects are pointed out.  So much depends on the
>application.  It does have musical applications.  Often the
>imperfections in an instrument are what make it interesting to the ear.
>
> >btw.2.: the 4046 circuit should be second order (it is).
> >There are more complicated pll concepts arround, I guess higher order.
> >But I didn't tale a look at them so far. Any experiences out there?
> >
> >
> >m.c.
> >
> >:::Date: Tue, 28 Nov 2000 13:10:54
> >:::From: Scott Gravenhorst <music.maker at gte.net>
> >:::To: synth-diy at node12b53.a2000.nl
> >:::Subject: Re: freq. mult.
> >:::X-Mail-Agent: RedStarWare SMTP Emailer v0.03
> >:::X-MDaemon-Deliver-To: synth-diy at node12b53.a2000.nl
> >:::
> >:::<possibly silly mode>
> >:::Hmm.  I'm conguring up an image of a 'synth-cordian', a
> >:::device that uses a PLL to track a mono VCO and pop it's
> >:::output up around 1 megahertz, this driving a TOG which
> >:::is connected to a zillion buttons that select notes
> >:::to mix into chords...  You play the VCO with one hand
> >:::and the chord buttons with the other.  Heh, well at
> >:::least you wouldn't have to pump it; or use the pumping
> >:::action as a controller for portamento/VCF.  Polka?
> >:::</possibly silly mode>
> >:::
> >:::WeAreAs1 at aol.com wrote:
> >:::>
> >:::>In a message dated 11/28/00 7:25:27 AM, blacet at monitor.net writes:
> >:::>
> >:::><< The standard method of using a PLL such as a 4046 and a binary 
>counter
> >:::>works well if you get the filter right. See "The CMOS Cookbook" by 
>Don
> >:::>Lancaster. >>
> >:::>
> >:::>This has got me thinking...  Do you guys remember the old EML "Poly 
>Box"?  It
> >:::>had a little one-octave keyboard and an input for a monophonic VCO, 
>and it
> >:::>would allow you to play polyphonic chords that you could then send to 
>your
> >:::>monophonic synth's VCF and VCA.  Obviously, it had some kind of 
>top-octave
> >:::>divider in it.  But what I would like to know is:  Did it require the 
>input
> >:::>of a very high frequency VCO (in order to put the top-octave 
>divider's output
> >:::>in a useful octave range), or did it have some kind of frequency 
>multiplier
> >:::>(PLL?) inside that allowed you to keep your monosynth VCO in a more 
>"normal"
> >:::>octave range?  Have any of you guys ever owned or looked inside one 
>of those
> >:::>Poly Boxes?
> >:::>
> >:::>Michael Bacich
> >:::
> >:::-- Scott Gravenhorst : On The Edge, but the Edge of What?
> >:::-- Linux Rex, Linux Vobiscum  |  RedWebMail by RedStarWare
> >:::-- FatMan: www.teklab.com/~chordman
> >:::-- NonFatMan: members.xoom.com/_XMCM/chordman/index.html
> >:::-- The 21st century does NOT start in the year 2000!!!
> >:::
> >
>
>-- Scott Gravenhorst : On The Edge, but the Edge of What?
>-- Linux Rex, Linux Vobiscum  |  RedWebMail by RedStarWare
>-- FatMan: www.teklab.com/~chordman
>-- NonFatMan: members.xoom.com/_XMCM/chordman/index.html
>-- The 21st century does NOT start in the year 2000!!!
>
>

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