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PICList Thread
'UV Erasing'
1997\03\27@210143 by crbres

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I've noticed that some are having long erase times with their PICs. I've
always had great luck with the DATARASE II ultraviolet device eraser. One of
its strong suits is that the UV lamp sits very close to the quartz window of
the device which quickens the erasing process.

If you have the $39.99 DATARASE II ultraviolet device eraser, read on:

I have one of these nice units and performed mods on it several years ago.
I'm not sure how significant the first mod is, but it should help out.

Here's what I did:

1)  I opened up the unit and put an aluminum foil reflector behind the
UV lamp.  Before installing the reflector, I really smoothed out the
aluminum foil.  Make sure you use the shiny side as the reflector.
This mod should reflect more UV light towards the chips.

2)  The second mod involves tampering with the internal electronics to
increase the power output to the UV lamp. The only reason I performed this
mod was because the DATARASE II manual says that the UV lamp is operated at
half its rated wattage.  The wattage on the bulb is 4 watts, so they are only
running the lamp at 2 watts.  My idea was to push the lamp close to 4 watts,
but definitely not more. Remember, more wattage=more light and
*MORE* heat.

I did some before mods/after mods testing on some windowed PIC chips.

What I did was program all cells to "0"s.  This meant programming $000
or $0000 to all locations in the PIC16C55/57 and PIC16C71
respectively.  I have found that the mods *DRAMATICALLY* speed up
erasure time.

The 16C71 erasure time went from 180 seconds down to 75 seconds.

The 16C55 and 16C57 erasure times went from 90 seconds down to 45
seconds.

But remember, these times are the intervals until all cells reach
"1"s.  To ensure good erase margin, they should be left in a little
longer.

On a final safety note, don't expose your eyes to UV light; UV light
can damage the eyes!  I totally encapsulated the bulb in a box while I
was making voltage and current measurements.

Be careful, no mod is worth risking safety!!!!!!!!!!!!!!!!!!!!!!!

Hope this helps,

Ken Pergola

1997\03\27@211207 by Anil Patel

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At 09:03 PM 3/27/97 -0800, you wrote:
>I've noticed that some are having long erase times with their PICs. I've
>always had great luck with the DATARASE II ultraviolet device eraser. One of
>its strong suits is that the UV lamp sits very close to the quartz window of
>the device which quickens the erasing process.
>
>If you have the $39.99 DATARASE II ultraviolet device eraser, read on:
>

I've got one of these.  To erase a 16c73a unit takes me approximately 12
minutes.  Its inconvenient because the built in timer only is adjustable
from 2 to 8 minutes.  So I have to run 1.5 cycles to fully erase.

>2)  The second mod involves tampering with the internal electronics to
>increase the power output to the UV lamp. The only reason I performed this
>mod was because the DATARASE II manual says that the UV lamp is operated at
>half its rated wattage.  The wattage on the bulb is 4 watts, so they are only
>running the lamp at 2 watts.  My idea was to push the lamp close to 4 watts,
>but definitely not more. Remember, more wattage=more light and
>*MORE* heat.
>
What exactly was your modification?  I'm interested in applying it to my unit.

--Anil

1997\03\28@081815 by Andy Kunz

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At 09:03 PM 3/27/97 -0800, you wrote:
>I have one of these nice units and performed mods on it several years ago.

I too modified my unit.  I cheated, though.  I simply closed the circuit
permanently that senses if the lid is on.  I did this because all my window
chips are inserted into machine pin sockets, so as not to wear out the
regular leads of the chip during the multiple insertions into the target
system.  With a socket on the bottom of the IC, the chips would get in the
way of the lid.

For safety reasons, you need to find another way to keep the light out of
your eyes without a lid.  I have the unit behind me, far enough away.

If someone were a little adventurous, they could get the cheaper Datarase
unit and make a PIC with a display to act as a timer.  My original thought
was to use an IR remote from a cable converter I did, with an LED display
and micro borrowed from the same project.  Just never got around to doing
it - it was cheaper to buy the more expensive eraser (because of time)!

Andy

==================================================================
Andy Kunz - Montana Design - 409 S 6th St - Phillipsburg, NJ 08865
         Hardware & Software for Industry & R/C Hobbies
       "Go fast, turn right, and keep the wet side down!"
==================================================================

1997\03\28@095803 by crbres

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Andy Kunz wrote:


>
> For safety reasons, you need to find another way to keep the light out of
> your eyes without a lid.  I have the unit behind me, far enough away.
>

Andy,

Oops, maybe you misunderstood me. Nothing has changed except I modified
the power output to the lamp. I'm still using the enclosure with a lid
of course. I removed the lamp and put the lamp in an enclosed box while
I was performing voltage and current measurements. Once I upped the
power to the lamp, I stuffed it back into the DATARASE enclosure. I
wouldn't even think about risking my eyes.

The aluminum foil reflector is a good idea -- other manufacturers use a
reflector. DATARASE does not have one so I opted to install one inside
the case.

Take care Andy,


Ken Pergola

1997\03\28@114831 by Andy Kunz

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At 09:58 AM 3/28/97 -0500, you wrote:
>> For safety reasons, you need to find another way to keep the light out of
>> your eyes without a lid.  I have the unit behind me, far enough away.
>>
>
>Andy,
>
>Oops, maybe you misunderstood me.

I understood what you said.  I think you misunderstood _me_!  The "you" in
the above paragraph should more properly have been "one who makes the
change described above" [my mod].

I think your mods are a great idea.  My Datarase has a reflector also, but
I didn't bump the output.  WOuld you mind describing what you did to yours
to increase power?  I think someone else on the list requested the same.

I was merely making another comment as to what modifications can be done
easily to a UV eraser.  Perhaps others can provide their mods?

Andy

==================================================================
Andy Kunz - Montana Design - 409 S 6th St - Phillipsburg, NJ 08865
         Hardware & Software for Industry & R/C Hobbies
       "Go fast, turn right, and keep the wet side down!"
==================================================================

1997\03\28@140916 by crbres

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Andy Kunz wrote:

> I think your mods are a great idea.  My Datarase has a reflector also, but
> I didn't bump the output.  WOuld you mind describing what you did to yours
> to increase power?  I think someone else on the list requested the same.
>

Hiya Andy,

Unfortunately I never documented my mod -- it was over 2 years ago. I
just hacked at it since I did not have access to a schematic. It might
have come down to lowering the value of a resistor. I'm sorry I don't
have the details -- I don't mean to be hanging a carrot in front of
everyone. What I did was to measure the voltage across the lamp and the
current and started varying components until the lamp was getting more
power. Then I sewed 'er back up and taht was all. I wish I documented
what I did, but it was real hacky.

Maybe a call to Walling Co. will yield a schematic.

Take care Andy,

Ken Pergola

1997\03\29@071306 by EVAN CRANNA

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Tanks for suggestions Ken...I'll Try them..
Evan
/s

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