[Lab] AC adapter question

Fri Jul 12 08:36:32 EDT 2013

Depending on how consistent you need the output of the IR LEDs you can always put two or three in series and reduce the size if the resistor, this would reduce the over amps used and make the whole thing more efficient.

C

Sent from my iPhone

On 2013-07-11, at 5:55 PM, "Michael Grant" <michael at krazatchu.ca<mailto:michael at krazatchu.ca>> wrote:

That's almost 9 amps ...

Michael

On Thu, Jul 11, 2013 at 7:42 PM, Britta Evans-Fenton <technical at artengine.ca<mailto:technical at artengine.ca>> wrote:
sorry that was a Maybe I AM drawing too many Amps.  (thanks for the help Darcy)

Britta
Technical Coordinator
Artengine.ca<http://Artengine.ca>

Ottawa Mini Maker Faire
Aug. 31 & Sept. 1 2013
www.makerfaireottawa.com<http://www.makerfaireottawa.com>
@MakerFaireOTT
#MMFO

On Thu, Jul 11, 2013 at 4:41 PM, Britta Evans-Fenton <technical at artengine.ca<mailto:technical at artengine.ca>> wrote:
Maybe I'm drawing too much Amps.  Would you recommend this AC converter over the last one: http://www.digikey.ca/product-detail/en/LS150-5/285-1817-ND/1918828

I would have Amps to spare on this one.

Britta
Technical Coordinator
Artengine.ca<http://Artengine.ca>

Ottawa Mini Maker Faire
Aug. 31 & Sept. 1 2013
www.makerfaireottawa.com<http://www.makerfaireottawa.com>
@MakerFaireOTT
#MMFO

On Thu, Jul 11, 2013 at 4:32 PM, Britta Evans-Fenton <technical at artengine.ca<mailto:technical at artengine.ca>> wrote:
There are 188 IR leds: http://www.digikey.ca/product-detail/en/QED233/QED233-ND/187410  All connected in parallel each with their own Resistor ( 91 OHM 1/4W 5% CARBON FILM)

Britta
Technical Coordinator
Artengine.ca<http://Artengine.ca>

Ottawa Mini Maker Faire
Aug. 31 & Sept. 1 2013
www.makerfaireottawa.com<http://www.makerfaireottawa.com>
@MakerFaireOTT
#MMFO

On Thu, Jul 11, 2013 at 4:00 PM, Ken <klmckinnon at rogers.com<mailto:klmckinnon at rogers.com>> wrote:
It should power a LOT of LED's.  How many were you using and what sort of current limiting resistor did you have....a quick circuit diagram would tell a lot.

Ken

On 7/11/2013 6:49 PM, Britta Evans-Fenton wrote:
A little question about AC adapters.

I have an artwork that I did that I used an AC adapter to get power.  It was on for 4 days during a show, and I was surprised on how hot it got.  (I almost burned myself).  I did have duct tape on it holding it to the back of a wall, so that may have been half the problem.

I'm showing the work again, but I'm wanting to make sure everything is safe.  I need to hide the adapter due to aesthetic reasons, so I wanted to create a little white box around it with air holes, and I was suggested a fan, although it if it getting hot due to over working, adding another fan might not be a good idea.

It is only a bunch of IR leds that it is powering, so I'm surprised at the power I am needing.

any help would be very well appreciated.

Here is the Adapter I used :
http://www.digikey.ca/product-detail/en/VGS-25-5/102-1928-ND/2045659

Here are the IR LEDS:
http://www.digikey.ca/product-detail/en/QED233/QED233-ND/187410

And the Resistors I have on them were 91 OHM 1/4W 5% CARBON FILM.

Britta
Technical Coordinator
Artengine.ca<http://Artengine.ca>

Ottawa Mini Maker Faire
Aug. 31 & Sept. 1 2013
www.makerfaireottawa.com<http://www.makerfaireottawa.com>
@MakerFaireOTT
#MMFO

_______________________________________________
Lab mailing list
1. subscribe http://artengine.ca/mailman/listinfo/lab
2. then email Lab at artengine.ca<mailto:Lab at artengine.ca>

_______________________________________________
Lab mailing list
1. subscribe http://artengine.ca/mailman/listinfo/lab
2. then email Lab at artengine.ca<mailto:Lab at artengine.ca>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://artengine.ca/pipermail/lab/attachments/20130712/fde6419c/attachment-0001.html>