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Old 22nd February 2019, 11:23 AM   #1
Feckie is offline Feckie  Australia
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Default Led lighting

Hi everyone

Is there anything I should be concerned about if I put some led lighting strips into my dac build? Would it emit anything such intereference.
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Old 22nd February 2019, 08:34 PM   #2
Speedskater is offline Speedskater  United States
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Some LED lighting systems create lots of interference while other systems don't!
Get an old fashioned battery powered AM radio. Tune it to a quite spot near the low end of the dial then hold it near the LED's.
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Old 22nd February 2019, 08:52 PM   #3
Feckie is offline Feckie  Australia
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Bummer, oh well at least I didn’t start drawing up the designs yet.
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Old 22nd February 2019, 09:44 PM   #4
oohms is offline oohms  Australia
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Depends on the power supply for them.. if you make a linear supply, you'll be fine
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Old 22nd February 2019, 10:01 PM   #5
phase is offline phase  United States
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Quote:
Originally Posted by oohms View Post
Depends on the power supply for them.. if you make a linear supply, you'll be fine
Exactly, no pwm chopper for the power or dimming. Most of the info for powering leds on the interweb is the old-skool type with resistors, and that is what you want to use for that application.
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Old 23rd February 2019, 01:23 AM   #6
Feckie is offline Feckie  Australia
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Oh ok then it might be possible. So the psu is the only concern for noise. So if I use a regulated psu non smps I should be ok. Correct?
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Old 23rd February 2019, 02:54 AM   #7
phase is offline phase  United States
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Yes, that is correct, and something else to consider is that the heat dissapated from leds can be something to manage. The best way imo is to just derate them so they are running at a fraction of their rated output current. While this is going to be not as bright, it is still easier to have more leds than to buss the heat somehow.
Also make sure and note the polarity of the leds, they only work the right way, and usually don't work after power has been applied the wrong way.
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Old 23rd February 2019, 03:07 AM   #8
Michael Bean is offline Michael Bean  United States
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I recommend you use an adjustable current source like this:

LED current source.JPG

This will supply anywhere from 1 mA to 12 mA to allow dimming the LED to an acceptable level.
You can string together multiple LEDs in series as long as you supply enough V+ voltage to overcome the total voltage drop of the whole string.

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Last edited by Michael Bean; 23rd February 2019 at 03:10 AM.
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Old 23rd February 2019, 03:29 AM   #9
avtech23 is offline avtech23  Australia
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Led lighting
What source of power is your DAC going to have?

How much heat is produced will depend on a few variables such as the type of LEDs you use, how many, the airflow arrangements of the enclosure etc. I wouldn't be tooworried out heat generation, but definitely good to keep it in mind when designing the chassis. Max. power dissipation of a 5mm LED such as http://www.farnell.com/datasheets/1911499.pdf, is less than 100mW.

Are you looking to use the pre-made encapsulated LED strips like these: 10/30CM 5050 LED STRIP LIGHTS RED GREEN BLUE DC12V TRAILER CARAVAN BOAT CAR | eBay

If they are straight forward dumb LEDs and not the fancy remote controlled flashing disco kind, then I don't think noise emissions will be much of an issue. Also tapping power and feeding it through it's own regulator circuit (like the one Michael posted) will be much quieter compared to powering it by a small (noisy) SMPS for instance.

You can always put an 'off' switch on the LED circuit to kill then when listening if it turns out they do generate more noise than you'd like...
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Last edited by avtech23; 23rd February 2019 at 03:34 AM.
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Old 23rd February 2019, 10:25 AM   #10
Feckie is offline Feckie  Australia
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So the design is for a my buffalo dac that has been in a chassis I bought from AliExpress but it’s been getting just too hot. The psu’s run naturally hot but where I live in brisbane it’s just too much for me to be comfortable (it’s in a glass hall cabinet with fans but probably not enough). I was a 1/4 way through putting the dac in a case which would work quite well with a class a amp however I have since decided to put that case to a different use.

I’m entertaining the idea of a layered aluminium chassis with each layer rounded over. In between an undetermined number of aluminium layers I will have an acrylic layer with leds behind. If led heat is an issue there would be an aluminium layer surround by acrylic.

Each acrylic layer would have rgb leds like they do in pc cases these days.

Each aluminium layer would be thermally attached to each other with the psus attached to these as a heat sink. Should be plenty without factoring in the led heat dissapation.

Could I use a placid HD psu for the leds? Current is adjustable with the remainder of what’s used shunted and dissapated.
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