msilveira Posted August 3, 2005 Report Share Posted August 3, 2005 I read as much information as I found on the internet about UV rays.... and found interesting the possibility to use UV leds replacing those big lamps to build an EPROM eraser ... A "Pocket EPROM eraser"...But as I'm not an specialist, I'm posting this topic to ask: Is it really possible to use these UV leds to build an eprom eraser?1.) Small size2.) Exposure timer (555?)2.) If there's a TTL replacement for 555, would a CR2032 battery do the job? Anyway, a rechargeable battery could be used, in this case, a 5v battery would be used, allowing the use of a 555 IC.There's a need to study the focus too... the led should light the whole EPROM window.Write down any other ideas for the project.This pagehttp://www.bivar.com/default.asp?p=products&c=UV%20LEDs&sub=T1%203/4%205mm%20UV%20LEDshas some UV Led specs(not a datasheet)...and this is a datasheet (any better UV Led datasheet link?) http://www.marktechopto.com/PDFs/Cotco/LC503MUV130P_040708.pdfThat's all for now :)Mauricio Quote Link to comment Share on other sites More sharing options...
audioguru Posted August 3, 2005 Report Share Posted August 3, 2005 Hi Mauricio,An UV LED is so dim that you need many of them focussed onto the EPROM, or a very long time (years?) to erase an EPROM.A little CR2032 lithium battery can supply up to only about 3mA for a few hours. You might need 300mA or more for a few hours.Try a single UV LED operating at its absolute max current of 20mA touching the window of an EPROM to erase it. Post again in a couple of years whether it is erased yet. ;D Quote Link to comment Share on other sites More sharing options...
msilveira Posted August 3, 2005 Author Report Share Posted August 3, 2005 Hahahaha, right...After some changes of the search pattern in google, I found that information.... cute idea... let's wait for UV Leds improvements in the future.... ;DBTW, what kind of UV lamp is best fitted for EPROM erasing: The transparent ones (germicide), the black ones(used in PC Mods), or the white fluorescent-like ones?Thanks! :) Quote Link to comment Share on other sites More sharing options...
source2 Posted August 3, 2005 Report Share Posted August 3, 2005 I think it is enough to take it into the sun ??? :) :)sorry for the mistakes Quote Link to comment Share on other sites More sharing options...
Guest Alun Posted August 3, 2005 Report Share Posted August 3, 2005 In short no it won't work, the radiation from UV LEDs is the wrong wavelength as they have a peak emission from 375nm to 400nm while UV erasers use germicidal mercury discharge lamps with a peak emission of 253.7nm. Quote Link to comment Share on other sites More sharing options...
Guest Alun Posted August 4, 2005 Report Share Posted August 4, 2005 I think it is enough to take it into the sun ??? :) :)That won't work either, as not much 253.7nm gets though to the earth's surface, you might get a ROM erases after a few weeks if you're lucky. Quote Link to comment Share on other sites More sharing options...
KeepGood Posted September 8, 2005 Report Share Posted September 8, 2005 You want to use germicidal bulbs (UVC). You can get them quite easily.Don't buy them from somewhere that is selling them specifically for eprom eraser units, they tend to charge alot more for them. Best getting them from a pet shop (used in aquariums). Quote Link to comment Share on other sites More sharing options...
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