[sdiy] Chinese MG-1s??!?

[Tom Corbitt]

Looking at the design, the only gotcha I see is the 4 TOG chips, which
brings up a question I've seen asked over and over again on the list
archives.

What's the best way to recreate a TOG?

Best for me means:

#1 Cheap. if a chip costs over $10-$15 or so, I start thinking ""there
has to be a cheaper way  to do this"
#2 Simple. it doesn't have to be a drop in replacement, but I don't
want to replace 1 part with a sprawl of twenty+ parts.
#3 Future proof. I want something that I can carry forward in future
design. Sooner or later everything shuffles off to that great fab in
the sky, so I want to be able to move my process on to the next big
thing.

Looking at past answers, the general trend seems to be towards using
micros like pics to handle the dividing. I've seem the "old crow"
code, but I've yet to see a post where anyone indicated that they'd
taken this idea to completion and used it successfully to replace a
common top octave chip.  It would seem to me that this approach would
result in a square wave out, that you'd still need to filter back into
a sine before using it musically.

Am I wrong? What am I missing?

On Fri, 07 Jul 2006, Bob Weigel posted a followup  to a thread titled
"Top Octave Synthesizer" that ended with the following statement:
"There are much cheaper solutions for sdiy projects so if there's no
particular reason to need *that* one I'd look into something like
that. -bob " (He was referencing the S50240 chip)

What are the cheaper solutions he's speaking of? The one thing the TOG
seem great at it is keeping the system in global tune without a lot of
tricky sync work between subsystems.

Tom




On Wed, Apr 30, 2008 at 9:10 AM, Metrophage <c0r3dump23 at yahoo.com> wrote:
>
>  --- anthony <aankrom at bluemarble.net> wrote:
>
>  >  The filter is what makes the MG-1 golden.
>
>  What makes the filter golden is patching a VCO to modulate the top
>  octave chip, modulating the VCF cutoff with the LFO, and patching the
>  envelope to modulate the VCF resonance. Whee!
>
>
>
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