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123
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N Cook
Guest
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 Posted:
Wed Nov 09, 2005 5:35 pm Post subject:
Re: Eprom Eraser, how to build |
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"123" <123@456.789> wrote in message
news:dkt3sh$ih8$1@tabloid.srv.ualberta.ca...
Control/0593550_450_SC_d1e3.jpg
| Quote: |
Thanks for your help
al_kw_ <at> hotmail <dot> com
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Somewhere on the 2 tips files on URL below is
tip for converting a small sun tan lamp
--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/ |
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Franc Zabkar
Guest
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| Posted:
Thu Nov 10, 2005 1:25 am Post subject:
Re: Eprom Eraser, how to build |
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On Wed, 09 Nov 2005 08:16:33 -0700, 123 <123@456.789> put finger to
keyboard and composed:
"An 'anti-bacterial' toothbrush holder (AU$25), a single capacitor and
a simple IC carrier are all you need for a fully-functioning EPROM
eraser."
http://www.siliconchip.com.au/cms/A_104058/article.html
-- Franc Zabkar
Please remove one 'i' from my address when replying by email.
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Andy
Guest
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| Posted:
Thu Nov 10, 2005 1:35 am Post subject:
Re: Eprom Eraser, how to build |
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Andy replies even more:
I just remembeedr that the EPROM frequency is 253.7 nanometers.
Here is a website that tells about how the erasers work. It should
answer your questions.
http://xtronics.com/memory/how_EPROM-works.htm
If you build yourself one, and can find a cheap source for parts,
please
post it on this newsgroup. I've been wanting to do this for some
time, myself, but am just too damn lazy to go to the trouble for
something
I'll only use once a year....... Thanks, and good luck
Andy |
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Andy
Guest
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| Posted:
Thu Nov 10, 2005 1:35 am Post subject:
Re: Eprom Eraser, how to build |
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Is it possible to build an inexpensive UV EPROM ERASER out of those
innexpensive UV LED Flashlights or the bulb from a bug zapper such as
this one:
Andy writes:
No. The frequency of the emission of a UV LED is far removed from
the
particular NARROW band of UV frequencies that can erase an EPROM...
I forget the actual center frequency needed for EPROM erasure, but if
the
spectral frequency is not very very close to it, the EPROM won't erase.
If you research it on the internet, you will learn a great deal...
For instance RF is RF, but an AM radio is not sensitive to TV
channels...
Same with UV, which covers a very wide spectral range. An EPROM is
like
a little , tuned, receiver.....
If I remember correctly, the germicical lamps will put out the proper
UV
frequency. They are fairly expensive, tho....... UV LEDs are
definitely
NOT near the proper frequency range......
Andy |
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Michael Kennedy
Guest
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| Posted:
Thu Nov 10, 2005 1:35 am Post subject:
Re: Eprom Eraser, how to build |
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You have to pay to read that article!?!??
"Franc Zabkar" <fzabkar@iinternode.on.net> wrote in message
news:07j4n19i66suv48hdt3fgk3p4if9rjhe87@4ax.com...
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Sjouke Burry
Guest
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| Posted:
Thu Nov 10, 2005 1:35 am Post subject:
Re: Eprom Eraser, how to build |
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Franc Zabkar wrote:
Could You refrain from giving links where you can only read the
first few lines,and have to pay $$$ fro the rest???
Unless of course you want to spam for a commercial URL.
Burry. |
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Stan Blazejewski
Guest
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| Posted:
Thu Nov 10, 2005 9:35 am Post subject:
Re: Re: Eprom Eraser, how to build |
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On Wed, 9 Nov 2005 15:35:41 -0000, "N Cook" <diverse@tcp.co.uk> wrote:
| Quote: |
"123" <123@456.789> wrote in message
news:dkt3sh$ih8$1@tabloid.srv.ualberta.ca...
Hello.
Is it possible to build an inexpensive UV EPROM ERASER out of those
innexpensive UV LED Flashlights or the bulb from a bug zapper such as
this one:
http://images.canadiantire.ca/media/images/GardenPatio/GardenLighting/Insect
Control/0593550_450_SC_d1e3.jpg
Thanks for your help
al_kw_ <at> hotmail <dot> com
Somewhere on the 2 tips files on URL below is
tip for converting a small sun tan lamp
|
I can attest to that, the sun lamp works great & can be bought from a charity
shop or yard sale for about $2.
--
Australia isn't "down under", it's "off to one side"!
stanblaz@netspace.net.au
www.cobracat.com (home of the Australian Cobra Catamaran)
http://groups.yahoo.com/group/cobra-cat/ |
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James Sweet
Guest
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| Posted:
Thu Nov 10, 2005 9:35 am Post subject:
Re: Eprom Eraser, how to build |
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123 wrote:
Couple weeks ago Fred Meyers had germicidal tubes for Hamilton Beach air
purifiers on sale, one of those would work nicely with a small
fluorescent inverter such as those used in cheap battery powered
under-cabinet lights. |
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James Sweet
Guest
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| Posted:
Thu Nov 10, 2005 9:35 am Post subject:
Re: Eprom Eraser, how to build |
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Michael Kennedy wrote:
| Quote: | You have to pay to read that article!?!??
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It's the whole magazine available online, you should be able to preview
a few articles for free every once in a while. There's a trick you can
use to view any of them free at any time too. |
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James Sweet
Guest
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| Posted:
Thu Nov 10, 2005 9:35 am Post subject:
Re: Eprom Eraser, how to build |
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| Quote: |
Could You refrain from giving links where you can only read the
first few lines,and have to pay $$$ fro the rest???
Unless of course you want to spam for a commercial URL.
|
Why? He doesn't work for the magazine.
Just do a search in Google for the first line of text from the article
and access it from there, you'll be able to read the whole thing. Not
sure why you didn't get to preview it unless you're on dialup and
someone with your IP recently read it. |
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Franc Zabkar
Guest
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| Posted:
Thu Nov 10, 2005 9:35 am Post subject:
Re: Eprom Eraser, how to build |
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On Thu, 10 Nov 2005 02:06:13 +0100, Sjouke Burry
<burryNULNULFOUR@PPLLAANNEETT.NNLL> put finger to keyboard and
composed:
| Quote: | Franc Zabkar wrote:
On Wed, 09 Nov 2005 08:16:33 -0700, 123 <123@456.789> put finger to
keyboard and composed:
Is it possible to build an inexpensive UV EPROM ERASER out of those
innexpensive UV LED Flashlights or the bulb from a bug zapper such as
this one:
http://images.canadiantire.ca/media/images/GardenPatio/GardenLighting/InsectControl/0593550_450_SC_d1e3.jpg
"An 'anti-bacterial' toothbrush holder (AU$25), a single capacitor and
a simple IC carrier are all you need for a fully-functioning EPROM
eraser."
http://www.siliconchip.com.au/cms/A_104058/article.html
-- Franc Zabkar
Please remove one 'i' from my address when replying by email.
Could You refrain from giving links where you can only read the
first few lines,and have to pay $$$ fro the rest???
Unless of course you want to spam for a commercial URL.
Burry.
|
Sorry. The bulk of the article basically describes how to increase the
time constant of the circuit by adding a large capacitor in parallel
with the existing one. That's about it.
-- Franc Zabkar
Please remove one 'i' from my address when replying by email. |
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Andy
Guest
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| Posted:
Thu Nov 10, 2005 5:35 pm Post subject:
Re: Eprom Eraser, how to build |
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Could You refrain from giving links where you can only read the
first few lines,and have to pay $$$ fro the rest???
Unless of course you want to spam for a commercial URL.--- Sjouke
Andy comments:
I have just wasted more time reading your personal net police
reply than I have on following the rest of this thread. Thank you
for trying to teach me patience , tolerance, and understanding. You
didn't go a good job of it , tho.....
Andy |
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Mark Zenier
Guest
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| Posted:
Fri Nov 11, 2005 9:41 am Post subject:
Re: Eprom Eraser, how to build |
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In article <1131574148.397613.278000@g47g2000cwa.googlegroups.com>,
Andy <andysharpe@juno.com> wrote:
| Quote: | Is it possible to build an inexpensive UV EPROM ERASER out of those
innexpensive UV LED Flashlights or the bulb from a bug zapper such as
this one:
Andy writes:
No. The frequency of the emission of a UV LED is far removed from
the
particular NARROW band of UV frequencies that can erase an EPROM...
I forget the actual center frequency needed for EPROM erasure, but if
the
spectral frequency is not very very close to it, the EPROM won't erase.
If you research it on the internet, you will learn a great deal...
|
And a lot of what you learn will be WRONG.
An EPROM cell will get erased by any electromagnetic radiation shorter
in wavelength than some limit determined by the device physics. (You can
even use X-Rays is you can find a source powerful enough).
But that wavelength is shorter than the 350 nanometer output of a lot of
UV lamps. Ie. the /BL or /BLB "poster lights" that are relatively safe.
These can light up the phosphorescent ink on posters, cure glue or
printed circuit etch resist, but not erase EPROMs. (Or at least not in
any reasonable length of time. Back in my starving student days I did
it with a poster lamp, but not many people want to wait for 3 1/2 days).
A 300 nanometer tanning bed lamp will do it in about an hour, a 258 (?)
nanometer germicidal lamp in just a few minutes. In other words,
if you can't get a sunburn or worse, it won't erase an EPROM.
Mark Zenier mzenier@eskimo.com
Googleproofaddress(account:mzenier provider:eskimo domain:com) |
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Asimov
Guest
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| Posted:
Sat Nov 12, 2005 1:35 am Post subject:
Re: Eprom Eraser, how to build |
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"Mark Zenier" bravely wrote to "All" (11 Nov 05 03:41:15)
--- on the heady topic of "Re: Eprom Eraser, how to build"
MZ> From: mzenier@eskimo.com (Mark Zenier)
MZ> Xref: core-easynews sci.electronics.repair:348213
MZ> In article <1131574148.397613.278000@g47g2000cwa.googlegroups.com>,
MZ> Andy <andysharpe@juno.com> wrote:
| Quote: | Is it possible to build an inexpensive UV EPROM ERASER out of those
innexpensive UV LED Flashlights or the bulb from a bug zapper such as
this one:
Andy writes:
No. The frequency of the emission of a UV LED is far removed from
the
particular NARROW band of UV frequencies that can erase an EPROM...
I forget the actual center frequency needed for EPROM erasure, but if
the
spectral frequency is not very very close to it, the EPROM won't erase.
If you research it on the internet, you will learn a great deal...
|
MZ> And a lot of what you learn will be WRONG.
MZ> An EPROM cell will get erased by any electromagnetic radiation shorter
MZ> in wavelength than some limit determined by the device physics. (You
MZ> can even use X-Rays is you can find a source powerful enough).
MZ> But that wavelength is shorter than the 350 nanometer output of a lot
MZ> of UV lamps. Ie. the /BL or /BLB "poster lights" that are relatively
MZ> safe. These can light up the phosphorescent ink on posters, cure glue
MZ> or printed circuit etch resist, but not erase EPROMs. (Or at least not
MZ> in any reasonable length of time. Back in my starving student days I
MZ> did it with a poster lamp, but not many people want to wait for 3 1/2
MZ> days).
MZ> A 300 nanometer tanning bed lamp will do it in about an hour, a 258
MZ> (?) nanometer germicidal lamp in just a few minutes. In other words,
MZ> if you can't get a sunburn or worse, it won't erase an EPROM.
An alternative is the warm midday sun in the summer. Someone tried to
convince me I could leave an eprom out on the beach for years and it
wouldn't erase but that was bs as anyone who gets a sunburn can attest.
I exposed pcb's outdoors in my early experiments. It took about 12
minutes under the Sun compared to about 2 minutes with a proper lamp.
A*s*i*m*o*v
.... Puddy-tat's not so bwave in Gwanny's microwave! |
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