[sdiy] Wikipedia DCO article

[Scott Nordlund]

The MKS30 and JX3P (and JX8P, JX10P, MKS70) use the same basic idea as
the Juno 6/60/106 (the Alpha Juno models are different) of a
voltage-controlled ramp reset by a clock, but with some added oscillator to oscillator modulation.  



The Bit 01 (and I'd assume the others in the series) use the binary-weighted output of a 4-bit counter to make a "fake saw", then a standard comparator to make the square/pulse wave.  The pulsewidth is adjustable, but not continuously (hmm, looks like there's room for a "really strange sounding PWM" mod).

The Poly 61 uses the Juno/JX method for one oscillator and a "fake saw" (like Poly 800?) on the other.



I checked the schematics just now...

----------------------------------------
> Date: Mon, 12 Jan 2009 21:57:05 -0700
> From: sounddoctorin at imt.net
> To: david.k.cornutt at boeing.com
> Subject: Re: [sdiy] Wikipedia DCO article
> CC: synth-diy at dropmix.xs4all.nl
>
> Oh I see what you mean. Yea I was thinking of the latter synths there
> and I did gramatically group them. I was thinking people probably
> associated a *type* of synth with 'Juno' and I was noting how this new
> series appeared the same year and THESE had the cpu driven
> waveforms...I'll make it more clear. The MKS30 and JX3P are timer as I
> recall along with the SX Kawai's, the Bit series and..maybe the poly61
> too...can't recall.
>
> Cornutt, David K wrote:
>
>>Nice work, Tom. One thing: The second-to-last paragraph
>>of the "Historical" section implies that the Juno-106 uses
>>the high-frequency pulse shaping method. In fact, all of
>>Juno-6, 60, and 106 use the same DCO design -- a ramp core
>>with reset pulses from a digital counter, controlled by the
>>microprocessor. I'm a bit sensitive to this because I keep
>>seeing people claim that the 106 is vastly different in
>>design from the 60, and it really isn't.
>>
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>>
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