[sdiy] Re: Other LED's

[phillip m gallo]

While being able to  program a  "solar erased" EPROM, the issue with
these devices, especially the antique one like the '32, is how complete
the erasure or programming is.  This is due to an expectation that some
"creep" over time does occur.   

"Industrial strength" EPROM Blowers check for levels below and above
specified min logic levels to ensure the quality of the erasure or burn.
Hobby Blowers typically use std logic parts and hence do not.

regards,
p


-----Original Message-----
From: owner-synth-diy at dropmix.xs4all.nl
[mailto:owner-synth-diy at dropmix.xs4all.nl] On Behalf Of Cornutt, David K
Sent: Wednesday, March 24, 2004 1:02 PM
To: synth-diy at dropmix.xs4all.nl
Subject: RE: [sdiy] Re: Other LED's


From: harrybissell [mailto:harrybissell at prodigy.net]
> 
> (I don't think that will work, the wavelength is probably not short 
> enough... but it might.  I'll try it  (not))

At a place I used to work at, we did some "unofficial" experiments once
to determine what would and wouldn't erase 2732 EPROMs.  We got one of
those black light tubes from Spencer Gifts and tried it.  It didn't work
worth a darn.  Just leaving the EPROMs in the sun actually worked
better.  (It took about one spring day's worth of sunlight to fully
erase them.  We re-burned these and they worked fine.  We never did get
one fully erased with the black light.)