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PICList Thread
'Erasing EPROM Pics'
1998\04\20@081236 by AutismUK

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When I was developing ROM chips for the BBC micro (for fun !)
and didn't have a UV eraser, it was possible to erase them
by leaving them in the sun for a while.

Can this be done with the Windowed EPROM Pics ? Has anyone
got a cheap alternative for erasing the EPROMS ?

Paul Robson (spam_OUTautismukTakeThisOuTspamaol.com)

1998\04\20@112938 by Mike Keitz

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On Mon, 20 Apr 1998 08:06:55 EDT AutismUK <.....AutismUKKILLspamspam@spam@AOL.COM> writes:

>Can this be done [earsing in the sun] with the Windowed EPROM Pics?

Newer chips, with their EPROM cells smaller and packed more closely
together, are not as sensitive to UV as the older EPROMs were.  You would
need to leave them in the sun for a long time.

>Has anyone got a cheap alternative for erasing the EPROMS ?

It's hard to beat the Datarase III.  If you can find a germicidal bulb
and put it in a standard fluorescent circuit or fixture, it will work.
By the time you've put in provisions to prevent exposure to UV your're
probably looking at about $40 which is what the Datarase costs.

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1998\04\20@115811 by Clewer,Brian

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Hi all,

I had a cheap solution to erasing the windowed chips.  It might be
slightly unbelievable and probably quite dangerous but it consisted of a
replacement tube for a proper UV eraser, a cheap fluorescent lamp a shoe
box and some tin foil!

Regards,
Brian.

1998\04\20@131453 by Alessandro Zummo

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Hello Mike

Il 20-Apr-98, Mike Keitz scrisse:

>> Has anyone got a cheap alternative for erasing the EPROMS ?

> It's hard to beat the Datarase III.  If you can find a germicidal bulb

Why the Datarase III is so good? What about his power?

--

  - *Alex* -

 http://freepage.logicom.it/azummo/

1998\04\20@140311 by Paul BRITTON

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>Poster:       "Clewer,Brian" <Brian.ClewerspamKILLspamTELEMATICS.COM>
>
>Hi all,
>
>I had a cheap solution to erasing the windowed chips.  It might be
>slightly unbelievable and probably quite dangerous but it consisted of a
>replacement tube for a proper UV eraser, a cheap fluorescent lamp a shoe
>box and some tin foil!
>
>Regards,
>Brian.

This is exactly what I did to improvise an eraser, buy one of the UV bank
note checkers, get a replacement 4" 'black UV' tube, attach a mains-DC PSU
to the battery contacts, put it with the PIC in a shoebox, switch on and
away you go!

( You just have to be smart enough to switch off before opening!)

(<FLAME SUIT ON>Though I doubt momentary exposure to the light does any
harm!)

I've since got hold of an emergency exit sign, which has a nice switchmode
PSU in it, and tube fittings. Just need to make a cover and fit a safety
switch.

(The SMPS is an uninterruptable type with a battery pack that is trickle
charged, so I could carry on erasing during a power cut!) Very useful!!!
(NOT)

Failing this I use the one at work!!!!

Paul BRITTON

1998\04\20@162112 by jimmie.funk

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Paul BRITTON wrote:
>
> >Poster:       "Clewer,Brian" <.....Brian.ClewerKILLspamspam.....TELEMATICS.COM>
> >
> >Hi all,
> >
> >I had a cheap solution to erasing the windowed chips.  It might be
> >slightly unbelievable and probably quite dangerous but it consisted of a
> >replacement tube for a proper UV eraser, a cheap fluorescent lamp a shoe
> >box and some tin foil!
> >
> >Regards,
> >Brian.
>
> This is exactly what I did to improvise an eraser, buy one of the UV bank
> note checkers, get a replacement 4" 'black UV' tube, attach a mains-DC PSU
> to the battery contacts, put it with the PIC in a shoebox, switch on and
> away you go!

How about this:

Take an old broken microwave (preferably a small one), remove the
magnetron, capacitor, and all that other dangerous stuff and replace it
with a flourescent lamp power supply controlled from the timer.  Use a
nice, powerful germicidal bulb and attach it in the oven cavity such
that you can move it up and down, use some sort or reflector as well.
Cover up (really well) all of the possible exits for light and you have
a UV device that has a timer and not only erases windowed devices but
can be used to make PCB's as well.

Neat?

James Oakley

EraseMEcc958390spam_OUTspamTakeThisOuTvulcan.northatlantic.nf.ca  -  jimmie.funkspamspam_OUTnf.sympatico.ca
--------------------------------------------------------------------
A mind is like a parachute, it only works if it's open.
                                       -- Frank Zappa
--------------------------------------------------------------------

1998\04\20@173909 by XYGAX

picon face
In a message dated 20/04/98  18:03:10, you write:

<< (The SMPS is an uninterruptable type with a battery pack that is trickle
charged, so I could carry on erasing during a power cut!) Very useful!!!
(NOT)
 >>
Would it not be more advantagous to use a relay and change the tube to a white
one (outside the shoebox) so that you could see during a power cut ?

Just a thaught..........

Steve............

1998\04\21@004904 by tjaart

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Paul BRITTON wrote:

> >Poster:       "Clewer,Brian" <@spam@Brian.ClewerKILLspamspamTELEMATICS.COM>
> >
> >Hi all,
> >
> >I had a cheap solution to erasing the windowed chips.  It might be
> >slightly unbelievable and probably quite dangerous but it consisted of a
> >replacement tube for a proper UV eraser, a cheap fluorescent lamp a shoe
> >box and some tin foil!
> >
> >Regards,
> >Brian.
>
> This is exactly what I did to improvise an eraser, buy one of the UV bank
> note checkers, get a replacement 4" 'black UV' tube, attach a mains-DC PSU
> to the battery contacts, put it with the PIC in a shoebox, switch on and
> away you go!

I mounted my 6W UV tube in a box made of an aluminimum plate bent in a
semi-parabolic shape wedged between two other (thick) plates with the
parabola machined into them.

I can put a EEPROM device anywhere in the eraser with the same exposure
time (2min - 3min for a PIC).

Friendly Regards

Tjaart van der Walt
KILLspamtjaartKILLspamspamwasp.co.za

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