[sdiy] Cheap frequency counter for oscillator calibration

[Karl Ekdahl]

Everyone; thanks for your awesome answers.

Never having used a strobe-tuner, it seems like they're working with a reference tone, hence one will have to tune both span and base-pitch at same time - no? That seems a little bit like a PITA...

It seems to me that for my purposes, making something that spits out a CV interval of an octave or a few and measures the incoming signal periods is the way to go! I'll start sketching on it...

Karl

--- Den mån 2010-04-26 skrev Andre Majorel <aym-htnys at teaser.fr>:

> Från: Andre Majorel <aym-htnys at teaser.fr>
> Ämne: Re: [sdiy] Cheap frequency counter for oscillator calibration
> Till: synth-diy at dropmix.xs4all.nl
> Datum: måndag 26 april 2010 13:04
> On 2010-04-25 23:15 -0700, David G.
> Dixon wrote:
> 
> > Ah.  Thanks, Achim.  I didn't quite
> understand the concept of
> > the "cent" of pitch.  Of course, this makes more
> sense than the
> > mixed log-linear thing I was doing.
> 
> VCO precision is better expressed in cents (or PPM if you
> must)
> than in percents. It's like THD -- I wish they'd switch to
> something sensible like PPM or dB...
> 
> > In any case, +/- 5 cents seems like a lot or tracking
> error,
> > doesn't it?  Particularly in the midrange.
> 
> There's hoping the error is concentrated below 50 Hz and
> above 3 kHz.
> "+/-quite-a-few-cents over many octaves" is not a very
> meaningful
> spec.
> 
> Have you managed to get rid of the 0.8 Hz error at 880 Hz
> ?
> 
> -- 
> André Majorel http://www.teaser.fr/~amajorel/
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