Homebrew PCBs

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]
>  >
>  >
>  >
>  >------------------------------------
>  >
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>  >
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>
>
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>
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>
>
>
>------------------------------------
>
>Be sure to visit the group home and check for new Links, Files, and Photos:
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>
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