SV: Re: SV: Re: [sdiy] VCO autotune for poly analog modular

[karl dalen]

I thought you understood my indirect sugestion?
Anyhow, you do need high resulution and also high
accuracy especially for the low freq range
even if you divide down your linear DAC.

*Static* DC and gain can be large but not huge!
Unfortunately they are *temperature and code* dependent.
Also, mux charge injection can play a role here to.
Mux Rds on plays a role it changes its value depending on voltage.

Even a ancient MCU would do, i don't see the reason why the wouldn't?

KD 

--- Antti Huovilainen <ajhuovil at cc.hut.fi> skrev:

> On Thu, 5 Apr 2007, karl dalen wrote:
> 
> > Use linear VCO no tuning!
> 
> Nah, use linear VCOs under microprocessor control. No manual tuning, no 
> trimming, no drift. All you need is a non ancient MCU (AVR, ARM, basically 
> anything that was invented after early 80s) and a high resolution DAC (but 
> not high accuracy, DC and gain error can be huge without problems).
> 
> Antti
> 
> "No boom today. Boom tomorrow. There's always a boom tomorrow"
>    -- Lt. Cmdr. Ivanova
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