[sdiy] Roland DCOs

[Tom Wiltshire]

The JX-3P and JX-8P circuits do seem to be extremely similar. The  
only serious difference seems to be using 4011 NAND gates rather than  
4066 analogue switches.

Thanks to everyone who's helped with this.

Regards,
Tom

On 26 Feb 2008, at 12:04, Florian Anwander wrote:

> Hi Tom
>
> >> I have to admit, I never really understood the metal crossmod.
> > Anyone else want to have a look at the circuit diagram and try and
> > tell us what's going on? Please?
> >
> > http://www.electricdruid.com/images/dcos/JX8PDCO.pdf
> This one is missing the DCO2. And the metal happens there.
>
> I made a oversight in the following file: http://fa.utfs.org/diy/ 
> jx3p/schemo/jx3p_DCOs.jpg
>
> There you can see: there are two control signals coming from the  
> CPU: one named "metal/sync" the other named only "sync". sync  
> additionally enables that the clock from counter1 resets counter2.  
> metal/sync enables that counter1 troggers TR107.
>
> The problem is, that I do not know whether the CV for oscillator2  
> changes in the metal mode.
>
> Florian
>