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<div class="elementToProof"><span style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);">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.<br>
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<div id="divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" face="Calibri, sans-serif" color="#000000"><b>From:</b> Synth-diy <synth-diy-bounces@synth-diy.org> on behalf of Tom Wiltshire <tom@electricdruid.net><br>
<b>Sent:</b> 20 December 2022 14:46<br>
<b>To:</b> mark verbos <markverbos@gmail.com><br>
<b>Cc:</b> synth-diy@synth-diy.org <synth-diy@synth-diy.org><br>
<b>Subject:</b> Re: [sdiy] Quantizer DAC or PWM?</font>
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<div class="" style="word-wrap:break-word; line-break:after-white-space">Ooh, that's an interesting idea!
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<div class="">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.
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<div class="">Tom<br class="">
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<div class="">On 20 Dec 2022, at 13:42, mark verbos via Synth-diy <<a href="mailto:synth-diy@synth-diy.org" data-auth="NotApplicable" class="">synth-diy@synth-diy.org</a>> wrote:</div>
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<div class="" style="word-wrap:break-word; line-break:after-white-space">Couldn’t one do something like that to replace an AM6070 µ-law DAC?
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<div class="">Mark<br class="">
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<div class="">On Dec 20, 2022, at 12:41 PM, Florian Anwander <<a href="mailto:fanwander@mnet-online.de" data-auth="NotApplicable" class="">fanwander@mnet-online.de</a>> wrote:</div>
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<div class="x_moz-cite-prefix">Hi<br class="">
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Am 19.12.22 um 22:54 schrieb Didier Leplae via Synth-diy:<br class="">
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<pre class="x_moz-quote-pre">Ah yes, a separate output for octaves is brilliant!</pre>
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btw Scott rider aka Old Crow used a similar trick to achieve Hz/V characteristics with an 8Bit:<br class="">
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<a href="https://github.com/cs80/CS15_SSK/" data-auth="NotApplicable" class="x_moz-txt-link-freetext">https://github.com/cs80/CS15_SSK/</a><br class="">
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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.<br class="">
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Florian<br class="">
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