[sdiy] VCO Accuracy

[John Mahoney]

At 05:15 PM 12/30/2007, Tom Adam wrote:

>A noob question about VCO's...
>How accurate does one calibrate a midi 2 CV unit (+/-0.001V)?
>How accurate does one calibrate a VCO? (+/-1Hz)
>I understand that the accuracy is limited by design, but what is the 
>"allowed" deviation before our human ear detects the error?
>
>I'm about to calibrate a MOTM 300 & 310 and an oakley VCO. Although 
>I've tuned them after building I'm looking to get all 3 of them in 
>"perfect" tune.  Is there an easy way to accomplish this?
>
>Thanks,
>ToAd

No such thing as a perfectly in tune VCO, though some are better than 
others. The best you can do is optimize one for a given frequency range.

For "perfect" tuning you need to go digital.

How much deviation is detectable? It depends on whether you are using 
1 VCO or more than one; if multiple VCOs, then their relative pitches 
are another factor. Small frequency differences between VCOs tuned to 
the same pitch will be heard as beating, like tremolo.
--
john


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