Someone is having a problem here.
Two 200uf 100V capacitors in series give you a 100uf 200V capacitor.
The capacitance divides by 2, the voltage multiplies by 2.
Bob Macklin
K5MYJ
Seattle, Wa.
"Real Radios Glow In The Dark"
----- Original Message -----
From: Harvey White
To: Homebrew_PCBs@yahoogroups.com
Sent: Tuesday, January 01, 2013 5:46 PM
Subject: Re: [Homebrew_PCBs] Re: plating holes with an exploding wire
On Tue, 1 Jan 2013 16:50:21 -0800 (PST), you wrote:
>Hi,
>
>Just get 20 200uF 100V capacitors and wire them in series. You then have a 200uF 2000V capacitor.
Actually, no, you end up with a 10uf at 2000 volt capacitor, and you
have to hope that the leakages balance, because if they don't, then
you have unequal voltages across the capacitors, and one of them is
likely to get more than the 100 volts you would want as a maximum (and
really, you'd rather have about 65 to 80 volts, anyway).
capacitors in parallel = resistors in series; capacitors in series =
resistors in parallel.
Harvey
>
>Check Ebay... lots of options
>
>Kevin I.
>
>
>
>________________________________
> From: Jeff Heiss <jeff.heiss@...>
>To: Homebrew_PCBs@yahoogroups.com
>Sent: Tuesday, January 1, 2013 2:20 PM
>Subject: RE: [Homebrew_PCBs] Re: plating holes with an exploding wire
>
>
>
>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]
>>
>
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>
>
>
>
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