[sdiy] 566 , was Re: Midwest Analog Product Books

[Scott Stites]

Hi John,

Before taking off, I did find my 566 book - mention is made of increasing the cap value to decrease the max frequency (though TH doesn't mention if that improves the waveform at the low end).  However, I'd say it's a safe bet that it does preserve the waveform - I think the degradation of the waveform is more related to lower CV levels than actual operating frequency (check out his block diagram of the chip).   Scaling the CV/frequency relationship with a larger cap should get you down into the LFO range with no degradation of the waveform.

I did have a brief, illicit affair with the 566 VCO over Christmas break.  It sounded great to me, but my ears have a rather high tin content.....

Sitting in a hotel room living vicariously through the SDIY list,
Scott




-----Original Message-----
From: john mahoney <jmahoney at gate.net>
Sent: Sep 27, 2004 8:30 PM
To: synth-diy at dropmix.xs4all.nl
Subject: Re: [sdiy] 566 , was Re: Midwest Analog Product Books

----- Original Message ----- 
From: "david wright" <bastardita at hotmail.com>
>
> hello everyone - i have all of henry's books. great stuff.
> i made a 566 VCO based on the 566 book w/ tri,
> pulse and saw outputs, sync in, pww input, 1/v oct
> and FM inputs.
[snip]
> the tuneable noise source is a good time as well.
>
> just thought i'd throw my 2 cents in

Thanks for doing so, you little bastard! ;-) It's nice to read about
real world results -- even I was tired of my speculation.

Is PWW the inverse of PWM? <chuckle>

I'll build a 566 VCO, too. Real Soon Now*.
--
john


* Trademark, Jerry Pournelle.



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