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Re: [TCML] Microwave caps

To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Subject: Re: [TCML] Microwave caps
From: Steve Ward <steve.ward@xxxxxxxxx>
Date: Fri, 4 Sep 2009 10:37:52 -0500
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Sure, but most microwave oven caps are 1uF, not 0.5uF.

Steve

On Fri, Sep 4, 2009 at 10:12 AM, Quarkster <quarkster@xxxxxxx> wrote:

> 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@xxxxxxxxx>
> To: "'Tesla Coil Mailing List'" <tesla@xxxxxxxxxx>
> 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@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] 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@xxxxxxxxx>
>>> To: "'Tesla Coil Mailing List'" <tesla@xxxxxxxxxx>
>>> 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.
>>>> Please
>>>> 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@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] 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@xxxxxxxxxxx> 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@xxxxxxxxxx
>>>>> 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
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> Tesla mailing list
>>>>> Tesla@xxxxxxxxxxxxxx
>>>>> http://www.pupman.com/mailman/listinfo/tesla
>>>>>
>>>>>
>>>>> Sent from my Verizon Wireless BlackBerry
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>>>>>
>>>>>
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>>>
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>
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Follow-Ups:
- Re: [TCML] Microwave caps
  - From: Quarkster

References:
- Re: [TCML] Microwave caps
  - From: nancylavoie
- Re: [TCML] Microwave caps
  - From: Steve Ward
- RE: [TCML] Microwave caps
  - From: Jim Mora
- Re: [TCML] Microwave caps
  - From: Quarkster
- Re: [TCML] Microwave caps
  - From: bartb
- RE: [TCML] Microwave caps
  - From: Jim Mora
- Re: [TCML] Microwave caps
  - From: Quarkster

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