[sdiy] Quantizer DAC or PWM?

[Mike Bryant]

Yes that's how we did it before there were A/u-law CODECs and DACs.  The PMI DAC100 was a favourite back then for this application.

________________________________
From: Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of Tom Wiltshire <tom at electricdruid.net>
Sent: 20 December 2022 14:46
To: mark verbos <markverbos at gmail.com>
Cc: synth-diy at synth-diy.org <synth-diy at synth-diy.org>
Subject: Re: [sdiy] Quantizer DAC or PWM?

Ooh, that's an interesting idea!

I'd have to sit down and have a bit of a think about it and do a few calculations, but that's really a lovely idea. Being able to run something like the cheap MCP4922 dual DAC as a u-law "higher res" audio DAC would be a very nice trick to pull off.

Tom


On 20 Dec 2022, at 13:42, mark verbos via Synth-diy <synth-diy at synth-diy.org<mailto:synth-diy at synth-diy.org>> wrote:

Couldn’t one do something like that to replace an AM6070 µ-law DAC?

Mark



On Dec 20, 2022, at 12:41 PM, Florian Anwander <fanwander at mnet-online.de<mailto:fanwander at mnet-online.de>> wrote:

Hi

Am 19.12.22 um 22:54 schrieb Didier Leplae via Synth-diy:

Ah yes, a separate output for octaves is brilliant!

btw Scott rider aka Old Crow used a similar trick to achieve Hz/V characteristics with an 8Bit:

https://github.com/cs80/CS15_SSK/

He uses a dual channel DAC MCP4922. DAC #1 is providing different reference voltages for each octave, which then are used by the DAC #2 which converts the same twelve note data to a spreading CV the higher the octave / refence voltage from DAC#1 respectively is.

Florian
_______________________________________________
Synth-diy mailing list
Synth-diy at synth-diy.org<mailto:Synth-diy at synth-diy.org>
http://synth-diy.org/mailman/listinfo/synth-diy
Selling or trading? Use marketplace at synth-diy.org

_______________________________________________
Synth-diy mailing list
Synth-diy at synth-diy.org<mailto:Synth-diy at synth-diy.org>
http://synth-diy.org/mailman/listinfo/synth-diy
Selling or trading? Use marketplace at synth-diy.org

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://synth-diy.org/pipermail/synth-diy/attachments/20221220/21f88ec4/attachment.htm>