# [TCML] Microwave caps

Quarkster quarkster at att.net
Fri Sep 4 09:12:37 MDT 2009

```Jim -

Still something wrong with your math ......

Assuming two series-connected .5uF capacitors per string, each string will
have a value of .25uF.

With a total of 90 capacitors available, one could assemble 45 strings,
yielding a total capacitance of 45 * .25 = 11.25uF.

Charging the entire 11.25uF capacitor bank to 10kv will provide a stored
energy of 563 joules (lower case j).

Regards,
Herr zapp

----- Original Message -----
From: "Jim Mora" <wavetuner at gmail.com>
To: "'Tesla Coil Mailing List'" <tesla at pupman.com>
Sent: Friday, September 04, 2009 1:40 AM
Subject: RE: [TCML] Microwave caps

> Whoops, I was thinking 2 caps would handle 10KV from what I have been
> reading. The 5 crept in as it is the way we would do it if we had a lot
> more
> caps. This setup would leave 45 pairs @.5uf each. @22.5uf and about 1125
> Joules as stated. I stand firmly corrected on "Joules" misspelling.
> Jim Mora
> We need more mind readers in the list ;-^)
>
> -----Original Message-----
> From: tesla-bounces at pupman.com [mailto:tesla-bounces at pupman.com] On Behalf
> Of bartb
> Sent: Thursday, September 03, 2009 6:18 PM
> To: Tesla Coil Mailing List
> Subject: Re: [TCML] Microwave caps
>
> I don't quite understand the post either.
> For 90 caps with 10.5kV rating, then 18 strings with 5 per string.
> Results in 1.8uF, 90j.
> Using 0.5uF/2100V MO caps.
>
> Regards,
> Bart
>
> Quarkster wrote:
>> Jim -
>>
>> I don't understand your post; can you explain the math? How did you
>> arrive at the "10kv" rating? With five series-connected caps per string?
>>
>> Joel's caps are predominently .5uF at 2,100V.
>>
>> (Incidentally, the unit of energy is "joule".)
>>
>> Regards,
>> Herr Zapp
>>
>>
>> ----- Original Message ----- From: "Jim Mora" <wavetuner at gmail.com>
>> To: "'Tesla Coil Mailing List'" <tesla at pupman.com>
>> Sent: Wednesday, September 02, 2009 10:42 PM
>> Subject: RE: [TCML] Microwave caps
>>
>>
>>> Hi Joel,
>>>
>>> Lets see, if you series 2 (10kv) easy- .5uf*(45 caps)=22uf= 1100 Jules-
>>> definitely a worthy ring launching, HD disk plates, or coin shrinker.
>>> be very careful with this as it is absolutely lethal. Be sure to
>>> discharge
>>> the caps a couple of times. The internal resistor will discharge them
>>> over
>>> time.
>>>
>>> Jim Mora
>>>
>>> -----Original Message-----
>>> From: tesla-bounces at pupman.com [mailto:tesla-bounces at pupman.com] On
>>> Behalf
>>> Of Steve Ward
>>> Sent: Wednesday, September 02, 2009 4:07 PM
>>> To: Tesla Coil Mailing List
>>> Subject: Re: [TCML] Microwave caps
>>>
>>> First thing: i cannot be held responsible for anything you do with your
>>> capacitors, but here is what i did with some of mine:
>>>
>>> http://www.stevehv.4hv.org/MOCs.htm
>>>
>>> As the previous poster mentioned, id highly suggest a very sturdy
>>> enclosure
>>> built to contain shrapnel and oil in the event that the weakest
>>> capacitor
>>> "lets go".  Pleeeeeeeease be extremely careful with these things when
>>> you
>>> gang them up, there is some very serious energy storage.  Other than
>>> that,
>>> MOCs seemed to work great for launching rings and other Not-So-Hard-Core
>>> pulse power stuff. Basically the caps are junk anyway, so why not have a
>>> little fun with them for awhile?  Just really keep safety in mind!!!
>>>
>>> Steve
>>>
>>> On Wed, Sep 2, 2009 at 5:04 PM, <nancylavoie at comcast.net> wrote:
>>>
>>>> I'm pretty certain I've seen them used in coin shrinkers.May be worth a
>>>> google search if interested.If I recall though none of the projects
>>>> I saw
>>>> used anywhere near ninety caps but perhaps you'll end up with a more
>>> robust
>>>> end result than those before you.I would imagine ring launchers and
>>>> rail
>>>> guns are also feasible.Probably wouldn't hurt to place your caps in a
>>> sturdy
>>>> enclosure no matter what you build.Just in case! Wyatt
>>>> ------Original Message------
>>>> From: Joel Torgeson
>>>> Sender: tesla-bounces at pupman.com
>>>> To: Tesla Mailing-list
>>>> ReplyTo: Tesla Coil Mailing List
>>>> Subject: [TCML] Microwave caps
>>>> Sent: Sep 2, 2009 4:09 PM
>>>>
>>>> A while ago I posted a question about the poor performance of my
>>>> coil, and
>>>> through the list's help, found out that microwave oven caps don't
>>>> work in
>>>> the tank circuit.
>>>> So here's my question: What should I do with 90 MWO caps? I have heard
>>> that
>>>> they are used in voltage doublers and filters, but is there another
>>> project
>>>> I could use them in? I have my eye on building a Marx generator, so
>>>> would
>>>> these work for that? Or any other project you all can think of?
>>>>
>>>> Thank you for your time!
>>>>
>>>>  Sincerely,
>>>> Joel Torgeson
>>>>
>>>>
>>>>
>>>>
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>>>>
>>>> Sent from my Verizon Wireless BlackBerry
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>>>>
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