[sdiy] New TOG board: $0.02 needed

[Scott Nordlund]

I've always wanted to retrofit a TOS-based synth with something that output Walsh functions instead of simple 2'/4'/8'/16' squares.  Of course this would require all the octave dividers to be replaced (with CPLDs?) and some more complex mixing, but I think it would be a nice alternative to the relatively boring square/pulse (and occasionally saw) waves.

I'm sure this is probably a bit beyond the scope of what you're trying to achieve, though.

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> Date: Tue, 6 Jan 2009 13:26:06 -0800
> From: madhun2001 at yahoo.com
> Subject: Re: [sdiy] New TOG board: $0.02 needed
> To: synth-diy at dropmix.xs4all.nl
>
> Inline code follows...
>
> --- On Tue, 1/6/09, Tim Parkhurst  wrote:
>
>> - Output pulse width option / modulation. I know it would
>> be difficult to
>> maintain a specific pulse width in the divided-down
>> octaves, but it's not
>> impossible and might be a nice timbral option, even if it
>> was just a 50% /
>> 75% option or something like that.
>
> I can easily make a version of the VHDL code that produces other than 50% duty cycle. I believe a version of the 50240 had 37% duty cycle.
>
>> - Option to add internal squares together to create saw-ish
>> output
>> waveforms. Worked pretty well for the ARP Little Brother
>> ;-) Could be cool
>> to create an octave of saws, and use one of your CPLD
>> boards for each octave
>> (rather than dividing down for subsequent octaves).
>
> I have a board being fabbed that has dividers and resistor chains to make sawtooths. Another board, also in fab, does sine waves.
>
>> - Output for chaining together several of your boards, as
>> mentioned above,
>> one for each octave. This may be what you've already
>> done with the seven
>> stage divider.
>
> The on-board divider allows for that, although it is cheaper to do post dividing of the octaves. Got a board for that as well...
>
>> Tim (not sure what my 2 cents is worth) Servo
>
> Way more than $02. Darned inflation...
>
> --TimR
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