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.comSubject: 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
>
>
>
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