[sdiy] MIDI DCOs

[Fredrik Carlqvist]

I am using a PIC18. There is a really neat way of using Timer1 and CCP1 to
form the DCO. Having two interrupt levels makes it possible to combine a
stable DCO with a MIDI receiver. It works really great. I'm working on
adding sawtooth to the existing PWM output.

Fredrik Carlqvist


-----Original Message-----
From: owner-synth-diy at dropmix.xs4all.nl
[mailto:owner-synth-diy at dropmix.xs4all.nl] On Behalf Of Fredrik Axtelius
Sent: Friday, January 09, 2004 13:11
To: synth-diy at dropmix.xs4all.nl
Subject: RE: [sdiy] MIDI DCOs


Hi!

I'm planning to build a PIC based DCO.
Care to share the source?

/frax

btw, got the following when I tried to email you directly.

The original message was received at Fri, 9 Jan 2004 13:04:43 +0100 
(CET)
from d1o265.telia.com [217.208.188.241]

   ----- The following addresses had permanent fatal errors -----
<Mark.Smith at pace.co.uk>
    (reason: 571 5.0.0 Domain Rejected: see 
http://ftp.pace.co.uk/ibf.html)

   ----- Transcript of session follows -----
... while talking to mailhost.pace.co.uk.:
>>> DATA
<<< 571 5.0.0 Domain Rejected: see http://ftp.pace.co.uk/ibf.html 554 5.0.0
Service unavailable <<< 503 5.0.0 Need RCPT (recipient)



citerar Mark Smith <Mark.Smith at pace.co.uk>:

>
> 	>Has anyone come up with a DIY, MIDI controlled, DCO bank?
Something like
> 	>8 DCO's that will polyphonically follow MIDI and send out a
> 	>corresponding Gate with each note on.
>
> 	I have done this for a single voice channel on my 303 clone,
you could use
> 8 processors or use an fpga to do this 8 times.
>
> 	http://www.meadowfield.freeuk.com/synth/tb303sch.PDF
>
>
> 	>I envision something like that with a Wiard Miniwave after
it, that
> 	>could be used to build a DCO based (no tuning problems) poly
synth along
> 	>the lines of a Juno 106, but with whatever waveshaping,
Filters, VCA's
> 	>and envelope's you want.
>
> 	this is what I did with a standard 303 backend, but I could
have used the
> juno-6 / SH-101 backend...
>
> 	mark
>
>