Hi
Being an electric operation on an arc welder, the electromagnetic field
generated probably killed the chip - they are sensitive to this sort os thing.


Tim


At 19:13 28/09/97 +1000, you wrote:
>Hey dudes!
>
>        Has anyone considered using arc welders as a source of strong UV
>to erase eproms.  I don't mean a full 50kg arc welder, but using the same
>concept of the spark it produces, and the UV from it.
>    I built an EPROM programmer and I wanted to test it.  I was able to
>test the readback function and did so sucessfully on many different
>EPROMS.  Then when I wanted to test programming i realised i didn't
>actually have a BLANK EPROM.  I don't have an eraser yet but i thought i
>would try the arc welder in our workshop (I am too impatient to wait for
>the sun to erase a chip).  I held an EPROM very close (about 5cm) to the
>arc.  It erased alright, in about 5s of continuous arcing.
>        Now i don't seem to be able to program it.  There are two
>possibilities : I killed the EPROM or my programmer simply does not work.
>        What I want to know is if this kind of UV is going to kill the
>chip?  I don't really care about EPROM's but I am thinking of investing in
>a window version '74 and was hoping to avoid buying an eraser, and waiting
>for the chip to erase.  Obviously i would not risk a '74 just to save a
>little time though.  Is what i am doing safe?
>
>
>Thanks in advance,
>David Lions
>
>


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