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PICList Thread
'Cheap Eraser'
1996\08\01@034324 by Martin Rogers

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As a hobbyist who relishes building equipment from hairy string and sealing wax
I can recommend using a small "sun lamp" for erasing PICs. I have thus far
successfully erased a 16C54 approx 50 times without harm. I have physically
separated the uv and ir parts of the lamp. It takes 20 mins in a single session.
I am reluctant to move the chip closer to the lamp as the chip gets quite hot -
this effect has been reduced with the application of Typpex to the chip! I dont
suppose this method is covered in Microchip application notes but it works for
me! Incidentally I have noticed that the high end memory takes longer to erase
with the exception of one location about a third up which takes longer still. I
notice from discussions here that the write cycle is more likely to determine
chip life than the erase cycle.

Martin

1996\08\01@084945 by rdmiller

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On Thu, 1 Aug 1996, Martin Rogers wrote:

> As a hobbyist who relishes building equipment from hairy string and
> sealing wax I can recommend using a small "sun lamp" for erasing PICs.
> I have thus far successfully erased a 16C54 approx 50 times without harm.
> I have physically separated the uv and ir parts of the lamp. It takes
> 20 mins in a single session.  I am reluctant to move the chip closer
> to the lamp as the chip gets quite hot - this effect has been reduced
> with the application of Typpex to the chip! I dont suppose this method
> is covered in Microchip application notes but it works for me!
[...]

I have a few questions about your letter:

 o Where would one get a "sun lamp"?

 o How does one "physically separate" the UV and IR parts
   of such a lamp?  Are they separate bulbs?

 o How hot is "quite hot"?

 o What's "Typpex"?

As a side note, you might reduce the heating by simply putting the
package to be erased under a reflective mask which has a hole to allow
light to fall only on the windowed area.  Aluminum foil would work.

Rick Miller
--------------------------------------------------------------------------
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1996\08\01@141519 by David Tait

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Martin Rogers wrote:

> As a hobbyist who relishes building equipment from hairy string and
> sealing wax I can recommend using ...

[info on "sun lamp" based eraser deleted]

In the UK, Maplin Electronics sell a small unit called a "UV bank note
checker" (on offer at the moment for GBP 4.99).  This is fitted with a
4W UV tube that is totally useless for erasing PICs however it will
take a Philips 4W replacement EPROM eraser tube.  Depending on where
you get the Philips tube (Maplin themselves sell them but not cheaply)
a PIC eraser can be made for well under GBP 20.00.

(WARNING: UV light damages eyes and care should be taken to make the
improvised unit light-tight while in use.)

David
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1996\08\02@131637 by leon

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A good way to make an eraser is to get a 1 ft 8W fluorescent lamp
fitting and replace the ordinary fluorescent tube with a UV tube. In the
UK these can be obtained quite cheaply from Service Trading Co., 57
Bridgman Rd., London, W4 5BB. Tel: 0181-995 1560. They sell a complete
kit of parts for #15, less case.

Leon
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Phone: +44 (0)1734 471424         |  many years ago in Oxford.

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