> > > > Hi,
> > > > > I've acquired a small number of EEPROMs from various things.
Unfortunately
> > > > these EEPROMs have been manufactured using "chip on board" technology.
Ergo,
> > > > I can't get a pinout for them.
> > > > > Does anyone know of a commonly-available chemical that can dissolve
or
> > > > otherwise remove the black epoxy coating over the chip? I've heard of
people
> > > > using nitric acid, but that stuff isn't exactly easy to get around
here...
> > > >
> > > > > Thanks.
> > > >
> > > > You may want to try MEK (methyl ethyl ketone) to soften and remove the
> > > > epoxy. If it's a conformal coating rather than epoxy, your best bet be
> > > > would be a solvent like ethyl acetate or a topical solvent sold for
> > > > this specific purpose.
> > >
> > > WOuld MEKP (methyl ethyl ketone peroxide) work ? :)
> > >
> > > This is used as the gelling agent of some types of casting resin .
> > >
> > > -A
> >
> > I don't know, since I've never heard of the stuff. By contrast, MEK is
> > a rather common solvent. Nasty, but common. :-)
>
> Yeah , saw some of that in Marquand's today .
1) Obtain 10W or so pulsed infra-red laserdiode
2) Test out on a few donor chips .
:)
(see the Laser FAQ)
> -A
>
> >
> >
> > Harry C.