Eprom Eraser, how to build
123
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
Thanks for your help
al_kw_ <at> hotmail <dot> com
N Cook
"123" <1...@456.789> wrote in message
news:dkt3sh$ih8$1...@tabloid.srv.ualberta.ca...
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/
Franc Zabkar
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.
Michael Kennedy
"Franc Zabkar" <fza...@iinternode.on.net> wrote in message
news:07j4n19i66suv48hd...@4ax.com...
Andy
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
Andy
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
Sjouke Burry
Could You refrain from giving links where you can only read the
first few lines,and have to pay $$$ fro the rest???
Unless of course you want to spam for a commercial URL.
Burry.
Stan Blazejewski
>
>"123" <1...@456.789> wrote in message
>news:dkt3sh$ih8$1...@tabloid.srv.ualberta.ca...
>> Hello.
>> Is it possible to build an inexpensive UV EPROM ERASER out of those
>> innexpensive UV LED Flashlights or the bulb from a bug zapper such as
>> this one:
>>
>http://images.canadiantire.ca/media/images/GardenPatio/GardenLighting/Insect
>Control/0593550_450_SC_d1e3.jpg
>>
>>
>> Thanks for your help
>> al_kw_ <at> hotmail <dot> com
>
>Somewhere on the 2 tips files on URL below is
>tip for converting a small sun tan lamp
I can attest to that, the sun lamp works great & can be bought from a charity
shop or yard sale for about $2.
--
Australia isn't "down under", it's "off to one side"!
stan...@netspace.net.au
www.cobracat.com (home of the Australian Cobra Catamaran)
http://groups.yahoo.com/group/cobra-cat/
James Sweet
> Hello.
> Is it possible to build an inexpensive UV EPROM ERASER out of those
> innexpensive UV LED Flashlights or the bulb from a bug zapper such as
> this one:
> http://images.canadiantire.ca/media/images/GardenPatio/GardenLighting/InsectControl/0593550_450_SC_d1e3.jpg
>
>
>
Couple weeks ago Fred Meyers had germicidal tubes for Hamilton Beach air
purifiers on sale, one of those would work nicely with a small
fluorescent inverter such as those used in cheap battery powered
under-cabinet lights.
James Sweet
> You have to pay to read that article!?!??
>
>
It's the whole magazine available online, you should be able to preview
a few articles for free every once in a while. There's a trick you can
use to view any of them free at any time too.
James Sweet
>
> Could You refrain from giving links where you can only read the
> first few lines,and have to pay $$$ 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.
Franc Zabkar
<burryNU...@PPLLAANNEETT.NNLL> put finger to keyboard and
composed:
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.
Andy
Could You refrain from giving links where you can only read the
first few lines,and have to pay $$$ fro the rest???
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
Mark Zenier
Andy <andys...@juno.com> wrote:
> 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 mze...@eskimo.com
Googleproofaddress(account:mzenier provider:eskimo domain:com)
spudnuty
I always was gonna do some projects with it but..... It's a Prometrics
Model 117. It has a mechanical timer that controls exposure. It works
but I pulled the power cord for some other project. I'd be glad to send
this to someone who could use it if they'd pay the shipping. eMail me
for pics and arrangements: spudnuty<at>aol<dot>com.
Richard
Asimov
--- on the heady topic of "Re: Eprom Eraser, how to build"
MZ> From: mze...@eskimo.com (Mark Zenier)
MZ> Xref: core-easynews sci.electronics.repair:348213
MZ> In article <1131574148.3...@g47g2000cwa.googlegroups.com>,
MZ> Andy <andys...@juno.com> wrote:
> 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!
Chris Jones
I tried eresing EPROMs in the sun, in Australia (i.e. proper sunlight).
From what I can remember, it took more than a week. That makes me very
scared of looking into one of those eraser tubes which can do it in
minutes. PCB resist uses longer, less dangerous wavelengths.
Chris
Asimov
--- on the heady topic of "Re: Eprom Eraser, how to build"
CJ> From: Chris Jones <lugn...@nospam.yahoo.com>
CJ> Xref: core-easynews sci.electronics.repair:348423
CJ> I tried eresing EPROMs in the sun, in Australia (i.e. proper
CJ> sunlight). From what I can remember, it took more than a week. That
CJ> makes me very scared of looking into one of those eraser tubes which
CJ> can do it in minutes. PCB resist uses longer, less dangerous
CJ> wavelengths. Chris
Okay, thanks for the heads up on that one. I'd like to be an eprom on
an Australian beach any day, as we're headed for winter here soon. In
the early 70's my roomy fell asleep under a tanning lamp. The skin was
as red as a cooked lobster's and then peeled off in swatches for days
after that. Not a pretty sight that lady was.
A*s*i*m*o*v
... Anyone not wearing 2,000,000 sunblock is gonna have a REAL_ BAD_ DAY_7
Ian French
"Chris Jones" <lugn...@nospam.yahoo.com> wrote in message
news:11nelhp...@corp.supernews.com...
Hi all,
For a real, serious, and cheap solution to erasing EPROMS try this link
http://www.rampantapathy.co.uk/epromeraser.html
He uses a 6 inch long, 4 Watt, Germicidal lamp in conjunction with a "Maplin
Torch", which in its normal state contained a normal flourescent tube.
The lamps are available from http://www.firstlightdirect.com/, and work out
to about £8.50 each including Postage and VAT.
I have just recently used a similar set up with a 9 inch tube and it works
fine, erasing the EPROM in about 10 minutes when place 0.5 inch from the
tube.
If any of you do this BE SURE to place the tube etc inside a light proof box
BEFORE switching the power on, this Wavelength of UV ( about 250
nanometres) is DANGEROUS to your eyesight.
I have found that a cardboard Boxfile is OK.
Bye,
Ian.
stic...@gmail.com
up in the bottled water purifier at the front door. Pick them up on
your way out. :)
Andy
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). --Mark
Andy replies:
Absolutely. If you put the EPROM in a large bonfire, it will also
be erased and the wavelength is much longer...... Additionally
applying a 25000 volt DC between the pins will probably erase
it . ANYTIME you overload the hell out of something's linear
parameters
with excess energy, the victim usually loses any memory...
However, the best way is to use the device physics to apply the
proper frequency to accomplish the task without risking damage
to associated internal components. In other words, do it like the
manufacturer says.
Otherwise, I found your post very informative. Thanks. I sure
hope your post wasn't some of that WRONG stuff you were talking about
on
the internet .. :>)))))
Andy
zapht
dead.
it makes a loud squealing noise also. hoping i could get a little
advice on servicing the set back to health
kip
very common..
kip
"zapht" <zapht_...@hotmail-dot-com.no-spam.invalid> wrote in message
news:a9adnS4ZG8c...@giganews.com...
Jason D.
I'm looking at exact same fault and same model as yours for a
estimate.
RCA tend to have a run of flybacks to fail on 32" to 36" because these
flybacks are bit underspec'ed.
Cheers, Wizard