| Thread Tools |
25th September 2012, 07:07 | #1 |
[M] Reviewer Join Date: May 2010 Location: Romania
Posts: 148,618
| UV LEDs expose PCBs, gives you a tan Among the projects that define electronic design, a UV exposure box is right up at the top of the list. These boxes shine UV light on a work piece and are used for everything from exposing photosensitive PCBs to erasing EPROMs. [carlolog] decided to build his own and ended up with a fairly impressive array of ultraviolet LEDs perfect for making PCBs or tanning the back of your hand. One important thing to remember when making large arrays of LEDs is current consumption and power needed to light the device up. [carlolog] naive assessment of how much power would be required used a 12 volt supply with 135 LEDs and 135 resistors, wasting a lot of energy and producing 24 Watts of heat. Of course this power consumption can be reduced by putting a few LEDs in series, so [carlolog] wired 3 LEDs together with a 150Ω resistor. This array requires just over 11 Watts and consumes less than 1 Amp; perfect for a desktop UV box. The enclosure for the box was crafted out of three Ikea photo frames, and a small timer circuit powered by an ATmega8 was added. Now whenever [carlolog] needs to wipe an EPROM, he can put the chip in the box, set the timer, and walk away. A very nice build, but when dealing with a lot of UV we must remind our readers: do not look into the UV array with your remaining eye. http://hackaday.com/2012/09/24/uv-le...ves-you-a-tan/ |
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
What has 114 LEDs and is always running? | Stefan Mileschin | WebNews | 0 | 30th September 2011 08:52 |
Leaked specs expose next-gen Xeon lineup | jmke | WebNews | 0 | 31st August 2011 07:29 |
Windows Mail bug may expose Vista users | jmke | WebNews | 1 | 24th March 2007 11:41 |
Various sex positions as demonstrated by LEDs and resistors | jmke | WebNews | 1 | 29th January 2007 21:30 |
Modding your RAM with LEDs | jmke | WebNews | 0 | 3rd April 2006 09:36 |
Unpatched Firefox flaw may expose users | Sidney | WebNews | 0 | 9th September 2005 16:34 |
OCZ Updates Memory Products with ULN2 PCBs | jmke | WebNews | 0 | 1st October 2004 12:16 |
NVIDIA GeForce 6-Series to Expose All Capabilities With New DirectX | jmke | WebNews | 0 | 16th April 2004 09:39 |
IA LEDs | Xploited Titan | Mad Bargains | 92 | 11th November 2003 11:45 |
Thread Tools | |
| |