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radiated emissions - possibly all over the audio band even if you didn't care about EMC</div>
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<div id="divRplyFwdMsg" dir="ltr" style="font-family:"Segoe UI";font-size:12pt"><span style="font-family: Calibri, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);"><b>From:</b> grant musictechnologiesgroup.com <grant@musictechnologiesgroup.com><br>
<b>Sent:</b> 30 November 2024 16:36<br>
<b>To:</b> tom@electricdruid.net <tom@electricdruid.net>; Mike Bryant <mbryant@futurehorizons.com><br>
<b>Cc:</b> synth-diy@synth-diy.org <synth-diy@synth-diy.org><br>
<b>Subject:</b> Re[2]: [sdiy] current sink idea</span>
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<div style="font-family: "Segoe UI"; font-size: 12pt;">Excuse my ignorance here,</div>
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<div style="font-family: "Segoe UI"; font-size: 12pt;">> I agree that would be asking for trouble. </div>
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<div style="font-family: "Segoe UI"; font-size: 12pt;">Are we talking about noise, LED destruction, photosensitive epilepsy (PSE) or what exactly?</div>
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<div style="font-family: "Segoe UI"; font-size: 12pt;">GB</div>
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<div style="font-family: "Segoe UI"; font-size: 12pt;">------ Original Message ------</div>
<div style="font-family: "Segoe UI"; font-size: 12pt;">From "Tom Wiltshire" <<a href="mailto:tom@electricdruid.net" id="OWA4b203d6a-da16-74b3-48fe-e7dcdff5b7ff" class="OWAAutoLink">tom@electricdruid.net</a>></div>
<div style="font-family: "Segoe UI"; font-size: 12pt;">To "Mike Bryant" <<a href="mailto:mbryant@futurehorizons.com" id="OWAfae56e96-8df0-b233-6b04-49f3be058022" class="OWAAutoLink">mbryant@futurehorizons.com</a>></div>
<div style="font-family: "Segoe UI"; font-size: 12pt;">Cc "<a href="mailto:synth-diy@synth-diy.org" id="OWA60e607d7-e1c7-174f-6d99-1948bea966e8" class="OWAAutoLink">synth-diy@synth-diy.org</a>" <<a href="mailto:synth-diy@synth-diy.org" id="OWA1b3004be-309c-84d0-ae18-0e5a4a9c9088" class="OWAAutoLink">synth-diy@synth-diy.org</a>></div>
<div style="font-family: "Segoe UI"; font-size: 12pt;">Date 11/30/2024 8:16:54 AM</div>
<div style="font-family: "Segoe UI"; font-size: 12pt;">Subject Re: [sdiy] current sink idea</div>
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I think he meant instead of the DAC, not to drive the backlight directly. I agree that would be asking for trouble.
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<div style="font-family: "Segoe UI"; font-size: 12pt;">Roman mentioned using a PWM pin as a basic DAC followed with a simple RC and the current sink, and that should be fine.</div>
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<div style="font-family: "Segoe UI"; font-size: 12pt;">On 30 Nov 2024, at 11:53, Mike Bryant <<a href="mailto:mbryant@futurehorizons.com" id="OWA01c0071c-6fb2-1878-78be-f8e65bf7560c" class="OWAAutoLink">mbryant@futurehorizons.com</a>> wrote:</div>
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One problem is low cost displays aren't shielded so you'll transmit the PWM frequency everywhere</div>
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<span style="font-family: Calibri, sans-serif; font-size: 11pt;"><b>From:</b> Synth-diy <<a href="mailto:synth-diy-bounces@synth-diy.org" id="OWAbe9054f0-754d-e3bf-d20f-5664d0244947" class="OWAAutoLink">synth-diy-bounces@synth-diy.org</a>> on behalf of Gordonjcp
<<a href="mailto:gordonjcp@gjcp.net" id="OWA5ceb171d-4965-1914-8428-0acf1fdd1533" class="OWAAutoLink">gordonjcp@gjcp.net</a>><br>
<b>Sent:</b> 30 November 2024 11:48<br>
<b>To:</b> <a href="mailto:synth-diy@synth-diy.org" id="OWA2f4a5d71-9e96-358d-c0f4-ada58ed1a3fe" class="OWAAutoLink">synth-diy@synth-diy.org</a> <<a href="mailto:synth-diy@synth-diy.org" id="OWAd4673e41-06b8-d457-88aa-437673dd7f53" class="OWAAutoLink">synth-diy@synth-diy.org</a>><br>
<b>Subject:</b> Re: [sdiy] current sink idea</span>
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On Sat, Nov 30, 2024 at 09:17:13AM +0100, Roman Sowa via Synth-diy wrote:<br>
> with 2 days ago.<br>
> Special needs require special solutions - I needed to control display's<br>
> backlit intensity from internal DAC of the microcontroller, which<br>
<br>
Immediate first question - why not use a PWM pin?<br>
<br>
--<br>
Gordonjcp<br>
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<span style="font-family: Calibri, sans-serif; font-size: 11pt;"><b>From:</b> Synth-diy <<a href="mailto:synth-diy-bounces@synth-diy.org" id="OWAcbcaf3f4-72b9-2a5d-0614-dfa7539a463c" class="OWAAutoLink">synth-diy-bounces@synth-diy.org</a>> on behalf of Gordonjcp
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<b>Sent:</b> 30 November 2024 11:48<br>
<b>To:</b> <a href="mailto:synth-diy@synth-diy.org" id="OWAd1294cc7-c6db-c563-dfd1-4236d1589d40" class="OWAAutoLink">synth-diy@synth-diy.org</a> <<a href="mailto:synth-diy@synth-diy.org" id="OWA77aa658d-a64c-943c-bf2d-b1e6380c4d96" class="OWAAutoLink">synth-diy@synth-diy.org</a>><br>
<b>Subject:</b> Re: [sdiy] current sink idea</span>
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On Sat, Nov 30, 2024 at 09:17:13AM +0100, Roman Sowa via Synth-diy wrote:<br>
> with 2 days ago.<br>
> Special needs require special solutions - I needed to control display's<br>
> backlit intensity from internal DAC of the microcontroller, which<br>
<br>
Immediate first question - why not use a PWM pin?<br>
<br>
--<br>
Gordonjcp<br>
<br>
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