<div dir="ltr">PWM is noooisy.....</div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, May 24, 2017 at 6:56 PM, Mike HEQX <span dir="ltr"><<a href="mailto:mike@heqx.com" target="_blank">mike@heqx.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">I would agree with pwm John, but if you have matching issues that are related to manufacturing variations or human perception then pwm only controls global brightness even if it is per color. Outside of that you need a physical tweak.<div class="HOEnZb"><div class="h5"><br>
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<br>
On 5/24/2017 12:52 PM, John Speth wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
I think the right way to equalize LED intensity is using PWM. Controlling it by varying the current will be difficult. - JJS<br>
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-----Original Message-----<br>
From: Synth-diy [mailto:<a href="mailto:synth-diy-bounces@synth-diy.org" target="_blank">synth-diy-bounces@synt<wbr>h-diy.org</a>] On Behalf Of Mike HEQX<br>
Sent: Wednesday, May 24, 2017 7:56 AM<br>
To: Rutger Vlek <<a href="mailto:rutgervlek@gmail.com" target="_blank">rutgervlek@gmail.com</a>><br>
Cc: <a href="mailto:synth-diy@synth-diy.org" target="_blank">synth-diy@synth-diy.org</a><br>
Subject: Re: [sdiy] SMD LED intensity and lenses<br>
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In that case there wont be much dispersion and absorption, which is what can even out the intensity variations.<br>
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Are you having trouble between colors or between colors and parts as well?<br>
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Variations in color intensity can be solved, but if the components are also not matched well that is more difficult.<br>
<br>
You might consider a diffuser disc of thin white or translucent material ( like Mylar or Acrylic ) to place over the led ring under the light pipes. You can also apply a color filter in this way.<br>
<br>
Mike<br>
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<br>
On 5/24/2017 10:43 AM, Rutger Vlek wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Hi Mike,<br>
<br>
The light pipes are transparent with a flat 3mm diameter surface on the panel side.<br>
<br>
Rutger<br>
<br>
<br>
On 24 mei 2017, at 15:55, Mike HEQX wrote:<br>
<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Are your light pipes white, transparent, or translucent?<br>
<br>
Do they have a flat or spherical light gathering surface?<br>
<br>
<br>
<br>
On 5/24/2017 2:52 AM, Rutger Vlek wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Hi guys/girls,<br>
<br>
I'm finishing up a new product that will contain a multi-color LED ring, which I plan to do with SMD leds in 4 different colors. In the prototype I had a hard time getting the intensities of the various colors of LEDs to match. I've now learned that not all manufacturers spec according to a comparable norm, so I've decided to stick with Kingbright components that at least have a reference to a uniform norm in their datasheets to make their reported intensities more or less comparable between colors and between leds. I can design in an option to regulate supply current to various colors individually, so technically I can compensate for any differences in intensity between leds.<br>
<br>
However, now I'm considering which leds to start with and have options for 0603 leds with a dome lens or flat lens. There will be lightpipes in front of the leds to bring light to the front panel, so is there any advantage or disadvantage to the type of lens? And more importantly, will I run into issues if I combine leds with a dome lens from one color (and spec'd brightness) with other types of lenses? I suspect the lightpipes will straighten out a big portion of the leds angle of dispersion, but I'm still hesitant to mix and match, as I feel the resulting brightness at the end of the lightpipe may vary.<br>
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Any suggestions?<br>
<br>
Regards,<br>
<br>
Rutger<br>
<br>
ps. LED rings are cool, as are bow ties.<br>
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</div></div></blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature" data-smartmail="gmail_signature">Quincas Moreira<br>Test Pilot at VBrazil Modular</div>
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