Homebrew PCBs

Jeff,

The official name is "Evaporative Cooler"...

One source of parts online: http://www.plumbersurplus.com/Cat/Evaporative-Cooler-Pumps-Parts/1244/List

Another: http://www.homedepot.com/webapp/catalog/servlet/Search?storeId=10051&langId=-1&catalogId=10053&keyword=Evaporative%20Cooler%20pumps&Ns=None&Ntpr=1&Ntpc=1&selectedCatgry=Search+All

Another: http://www.johnstonesupply.com/storefront/hvacr-parts/air-conditioning-refrigeration-components/evaporative-cooler-parts/c1027991-c1027234-c1028291-p1.html



- Ken -



--- In Homebrew_PCBs@yahoogroups.com, Jeff Heiss  wrote:
>
> I checked Walmart for immersion pump and swamp pump but did not see any listed.  Could you give a reference to one online?
> 
> Jeff
> 
> -----Original Message-----
> From: Randall Morgan 
> Sent: Tuesday, January 29, 2013 3:25 PM
> To: Homebrew_PCBs@yahoogroups.com
> Subject: Re: [Homebrew_PCBs] thoughts on electric paint sprayer for spray etching
> 
> A "Swamp" cooler is a type of air conditioning device that works by
> the evaporation process to cool air. They are very simple. Water is pumped
> to the top of panels usually filled with burlap or hemp fibers. The water
> runs down through the fibers soaking them. Air is then pulled through the
> fiber panels and blown into the room. As the air is pulled through the
> fibers it picks up maximum humidity. Once released into the room the air
> evaporates its excess humidity to conform with
> current atmospheric conditions. As the water is released from the air it
> takes heat with it. Air itself is a very poor storage medium for heat and
> stores most of its heat in the moisture contained in it.
> 
> Swamp pumps can be purchased at most hardware stores and even walmart.
> 
> 
> 
> On Tue, Jan 29, 2013 at 7:26 AM, Jeff Heiss  wrote:
> 
> > **
> >
> >
> > Todd, I like your ideas. What is a "swamp" cooler pump? I am not familiar
> > with drip irrigation spray heads. Are they like mister nozzles for gardens?
> >
> > Jeff
> >
> >
> > -----Original Message-----
> > From: Todd F. Carney k7tfc@...>
> > Sent: Tuesday, January 29, 2013 2:35 AM
> > To: Homebrew_PCBs@yahoogroups.com
> > Subject: Re: [Homebrew_PCBs] thoughts on electric paint sprayer for spray
> > etching
> >
> > On Mon, Jan 28, 2013 at 8:47 PM, Jeff jeff.heiss@...> wrote:
> > >
> > > What are opinions on using an electric paint sprayer to spray etch a
> > > board? Could an electric sprayer be modified to run etchant so it can
> > > resist corroding? Would the spray pattern, droplet size, and spray force
> > be
> > > acceptable?
> > >
> >
> > Jeff,
> >
> > Just to clarify, do you mean for the sprayer to resist corrosion? If you
> > use ferric chloride, that doesn't seem likely. Maybe not even a persulfate
> > etchant.
> >
> > I used to use shop-built bench-top (actually, lab-sink-top) spray-based
> > etching machine that was pretty much all plastic. It consisted of an
> > open-top plastic tank, an immersion heater (from a small hot-water heater),
> > an immersion pump from a "swamp" cooler, and sprayers made of PVC pipe, and
> > a holder that clamped the board to be etched in a frame. The sprayers hit
> > the board evenly on both sides at once. The little spray heads were made
> > for drip-irrigation use. We placed a sheet of plexiglass on top to contain
> > overspray and so we could monitor the etching. We used persulfate etchant
> > in it (which we left in it until it had to be replaced) so it was not a
> > source of staining-or-toxic ferric chloride. I don't know how or if that
> > damn stuff would work in such a machine. We never used it. I don't think
> > any professional or commercial pcb outfits use it either.
> >
> > These days, a darkroom tray works for the one or two boards I might make in
> > a month. I use home-made peroxide-muriatic-salt etchant. I just hand
> > agitate the tray. I was toying with the idea of making a motorized rocking
> > agitator, but then I came to my senses.
> >
> > 73,
> >
> > Todd
> >
> > ----------------------------------------------------------
> > K7TFC / Medford, Oregon, USA / CN82ni / UTC-8
> > ----------------------------------------------------------
> > QRP (CW & SSB) / EmComm / SOTA / Homebrew / Design
> >
> > [Non-text portions of this message have been removed]
> >
> > [Non-text portions of this message have been removed]
> >
> >  
> >
> 
> 
> 
> -- 
> If you ask me if it can be done. The answer is YES, it can always be done.
> The correct questions however are... What will it cost, and how long will
> it take?
> 
> 
> [Non-text portions of this message have been removed]
> 
> 
> 
> ------------------------------------
> 
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