Digikey has them, though they are $16,27 USD each. 820uf at 500 VDC
At 11:03 AM 1/2/2013, you wrote:
>Can you suggest a place where 800uF, 500v caps can be found?
>
>
>-----Original Message-----
>From: Mark Lerman <mlerman@...>
>Sent: Wednesday, January 02, 2013 10:04 AM
>To: Homebrew_PCBs@yahoogroups.com
>Subject: RE: [Homebrew_PCBs] Re: plating holes with an exploding wire
>
>
>Shouldn't be a problem - you could use electrolytic caps in series
> and parallel combinations, eg 4 x 800 uf 500 V caps in series = 200
> uf at 2000 V.
>
> At 05:20 PM 1/1/2013, you wrote:
> >The pdf titled Exploding Wires - Principles, Apparatus, and Experiments,
> >says a rule of thumb for exploding a wire is 200uF at 2000v. Meaning charge
> >a 200uF capacitor to 2000v and short it with a wire. The length of wire
> >used in the article was 6 inches to 12 inches long.
> >
> >
> >
> >A wire exploded inside a through-hole or via would only be 1/16" long
> >(0.062"). Can the 200uF requirement be reduced since the length of wire is
> >shorter?
> >
> >
> >
> >Microwave capacitors are 1uF so 200 would be required. Where can large
> >capacitors be found so 200 craigslist microwaves are not required?
> >
> >
> >
> >Jeff
> >
> >
> >
> > _____
> >
> >From: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew_PCBs@yahoogroups.com]
> >On Behalf Of smilingcat90254
> >Sent: Sunday, December 09, 2012 2:59 AM
> >To: Homebrew_PCBs@yahoogroups.com
> >Subject: [Homebrew_PCBs] Re: plating holes with an exploding wire
> >
> >
> >
> >
> >
> >Just a minor point, in a vacuum, there is very little to no gas.
> Fans do not
> >help. If you are going to that trouble, just plate it.
> >
> >I've uploaded the schematic into Files/"constant current source" of
> >Electronics - 101. If you want it here I can uploade it into
> >Homebrew_PCBs/Files directory. Yes the circuit has been built and tested.
> >Over temperature detection and shutdown for safety does work as designed.
> >All you need is a reasonably powerful power supply, and few other
> things and
> >you should be able to plate it!!
> >
> >Copper sulfate: obtained as ZEP at Home Depot.
> >Hcl: obtained as Muriatic acid (very little needed)
> >Sulfuric acid: obtained as battery acid at NAPA auto parts supply. (very
> >little needed bought quart size)
> >
> >Heavy rubber gloves to handle corrosive acid
> >Face shield to protect your eyes and face while handling muriatic acid and
> >battery acid.
> >Rubber apron to protect your body while handling the acid.
> >
> >If you want more hand holding, just ask!
> >
> >Sincerely,
> >
> >Smilingcat
> >
> >--- In Homebrew_PCBs@yahoogroups.com
> ><mailto:Homebrew_PCBs%40yahoogroups.com> , "Jeff Heiss" <jeff.heiss@...>
> >wrote:
> > >
> > > Can a vacuum deposition work? Would the vapor get into small vias, say
> > > 0.008"? Maybe a fan inside would help?
> > >
> > >
> > >
> > > https://www.youtube.com/watch?v=G2FhHuFrZrQ forward to 4:50 for the good
> > > stuff.
> > >
> > >
> > >
> > > Jeff
> > >
> > >
> > >
> > > _____
> > >
> > > From: Homebrew_PCBs@yahoogroups.com
> ><mailto:Homebrew_PCBs%40yahoogroups.com>
> >[mailto:Homebrew_PCBs@yahoogroups.com
> ><mailto:Homebrew_PCBs%40yahoogroups.com> ]
> > > On Behalf Of Slavko Kocjancic
> > > Sent: Saturday, December 08, 2012 12:37 PM
> > > To: Homebrew_PCBs@yahoogroups.com
> <mailto:Homebrew_PCBs%40yahoogroups.com>
> >
> > > Subject: Re: [Homebrew_PCBs] Re: plating holes with an exploding wire
> > >
> > >
> > >
> > >
> > >
> > > On 8.12.2012 17:09, alan00463 wrote:
> > > > How about just regular solid-conductor wire (Cu, Sn, etc.) ?
> > > > If it's the right diameter, it will fit into the holes.
> > > > Why wouldn't that work fine ?
> > > >
> > > >
> > > And how to pass component into that hole? Solid wire can be used only
> > > for "vias".
> > > Plating is to leave hole opened but to have electric contact with both
> > > layers.
> > > So if the hole is plated and you put resistor lead to the hole and
> > > solder in one side, the capilar "wick" efect will pull solder into the
> > > hole thru to other side. If hole is not plated then you must solder in
> > > both sides. And there is the problem. Resistors can be soldered in both
> > > sides but what for electrolytic capacitors?!?
> > >
> > > Slavko.
> > >
> > >
> > >
> > >
> > >
> > > [Non-text portions of this message have been removed]
> > >
> >
> >
> >
> >
> >
> >[Non-text portions of this message have been removed]
> >
> >
> >
> >------------------------------------
> >
> >Be sure to visit the group home and check for new Links, Files, and Photos:
> >http://groups.yahoo.com/group/Homebrew_PCBsYahoo! Groups Links
> >
> >
> >
>
>
>[The entire original message is not included]
>
>[Non-text portions of this message have been removed]
>
>
>
>------------------------------------
>
>Be sure to visit the group home and check for new Links, Files, and Photos:
>http://groups.yahoo.com/group/Homebrew_PCBsYahoo! Groups Links
>
>
>