Homebrew PCBs

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]