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Re: Jim Hurley's DIY pH Controller and Hey MOM We're NO.4!
On Thu, 4 Mar 1999, Peter W O'Dwyer jnr wrote:
> Folks,
> Back in 93 Jim Hurley graced The Krib with instructions on a DIY pH
> Controller.
Actually, it was rec.aquaria; The Krib didn't start until '94. :) But
anyway...
> I also recall, Jim mentioning an error on the prints and
> subsequently recommended changing one of the resistors of a given value to
> something else. I've lost Jim's addendum and am unable to relocate it. Does
> anyone know if the plans on the Krib contain the change.
> http://www.thekrib.com/Plants/CO2/hurley-schemat.gif
Jim just recently contacted me (January) and clued me in to a new version
of the schematic (more readable), so I replaced the file. I'd guess it
has the update. I also have the full notebook xerox he sent out to a few
folks at the time, so I could check that.
- Erik
--
Erik Olson
erik at thekrib dot com