National AN-299 VCO idea (was: Re: [sdiy] Exponential converter information)

[synth at oldmail.charlielamm.com]

Nice links....I esp. like this one:

http://www.national.com/an/AN/AN-299.pdf#page=1

Has anyone actually messed around with this? i.e., can you really use a
LM3046 and the temp dependence of a polystyrene cap as they show here, to
cancel temp drift of a VCO?

Maybe if you get a bunch of caps and try each one?

Seems like a lot of work.....put in a cap, heat it up, see if it goes out
of tune....but it's an interesting idea.....


On Sun, 19 Jun 2005, Ray Wilson wrote:

> Some links:
> 
> http://www.national.com/an/AN/AN-311.pdf
> http://www.national.com/an/AN/AN-286.pdf#page=4
> http://www.national.com/an/AN/AN-299.pdf#page=1
> 
> I hope you find them useful.
> 
> Ray
> 
> 
> ----- Original Message ----- 
> From: "Aaron Bader" <sparked at zadzmo.org>
> To: <synth-diy at dropmix.xs4all.nl>
> Sent: Saturday, June 18, 2005 1:22 PM
> Subject: [sdiy] Exponential converter information
> 
> 
> > 
> > Can anyone suggest a good tutorial on exponential circuits? I can find
> > schematics aplenty, particularly as part of some larger vco/vca circuit,
> > but nothing that attempts to explain what exactly is going on in detail.
> > -- 
> > 
> > "Not a bird not a leaf not a sound/And well after the close of time" 
> > --Front 242
> > 
> > Public Key: http://sparked.zadzmo.org/
> >
>