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<div>Excuse my ignorance here,</div>
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<div>> <span>I agree that would be asking for trouble. </span></div>
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<div><span>Are we talking about noise, LED destruction, photosensitive epilepsy (PSE) or what exactly?</span></div>
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<div><span>GB</span></div>
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<div>------ Original Message ------</div>
<div>From "Tom Wiltshire" <<a href="mailto:tom@electricdruid.net">tom@electricdruid.net</a>></div>
<div>To "Mike Bryant" <<a href="mailto:mbryant@futurehorizons.com">mbryant@futurehorizons.com</a>></div>
<div>Cc "<a href="mailto:synth-diy@synth-diy.org">synth-diy@synth-diy.org</a>" <<a href="mailto:synth-diy@synth-diy.org">synth-diy@synth-diy.org</a>></div>
<div>Date 11/30/2024 8:16:54 AM</div>
<div>Subject Re: [sdiy] current sink idea</div>
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<blockquote cite="4C34606D-83A4-4E58-BE8F-40F5B9751771@electricdruid.net" type="cite" class="cite2">
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 class="">Roman mentioned using a PWM pin as a basic DAC followed with a simple RC and the current sink, and that should be fine.
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<div class="">On 30 Nov 2024, at 11:53, Mike Bryant <<a href="mailto:mbryant@futurehorizons.com" class="">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;" class=""><b class="">From:</b> Synth-diy <<a href="mailto:synth-diy-bounces@synth-diy.org" class="">synth-diy-bounces@synth-diy.org</a>> on behalf of Gordonjcp <<a href="mailto:gordonjcp@gjcp.net" class="">gordonjcp@gjcp.net</a>><br class="">
<b class="">Sent:</b> 30 November 2024 11:48<br class="">
<b class="">To:</b> <a href="mailto:synth-diy@synth-diy.org" class="">synth-diy@synth-diy.org</a> <<a href="mailto:synth-diy@synth-diy.org" class="">synth-diy@synth-diy.org</a>><br class="">
<b class="">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 class="">
> with 2 days ago.<br class="">
> Special needs require special solutions - I needed to control display's<br class="">
> backlit intensity from internal DAC of the microcontroller, which<br class="">
<br class="">
Immediate first question - why not use a PWM pin?<br class="">
<br class="">
--<br class="">
Gordonjcp<br class="">
<br class="">
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<span style="font-family: Calibri, sans-serif; font-size: 11pt;" class=""><b class="">From:</b> Synth-diy <<a href="mailto:synth-diy-bounces@synth-diy.org" class="">synth-diy-bounces@synth-diy.org</a>> on behalf of Gordonjcp <<a href="mailto:gordonjcp@gjcp.net" class="">gordonjcp@gjcp.net</a>><br class="">
<b class="">Sent:</b> 30 November 2024 11:48<br class="">
<b class="">To:</b> <a href="mailto:synth-diy@synth-diy.org" class="">synth-diy@synth-diy.org</a><span class="Apple-converted-space"> </span><<a href="mailto:synth-diy@synth-diy.org" class="">synth-diy@synth-diy.org</a>><br class="">
<b class="">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 class="">
> with 2 days ago.<br class="">
> Special needs require special solutions - I needed to control display's<br class="">
> backlit intensity from internal DAC of the microcontroller, which<br class="">
<br class="">
Immediate first question - why not use a PWM pin?<br class="">
<br class="">
--<br class="">
Gordonjcp<br class="">
<br class="">
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