# [TCML] Microwave caps

Quarkster quarkster at att.net
Fri Sep 4 12:29:14 MDT 2009

```Steve -

True, but the specific caps being discussed in THIS thread are rated at
.5uF.

Jim used the .5uF value in his calculations (see his posts on Sept 2nd and
4th), but didn't quite end up with the correct capacitance value for Joel's
"Maxi-Multi-Capacitor".

Herr Zapp
----- Original Message -----
From: "Steve Ward" <steve.ward at gmail.com>
To: "Tesla Coil Mailing List" <tesla at pupman.com>
Sent: Friday, September 04, 2009 8:37 AM
Subject: Re: [TCML] Microwave caps

> Sure, but most microwave oven caps are 1uF, not 0.5uF.
>
> Steve
>
> On Fri, Sep 4, 2009 at 10:12 AM, Quarkster <quarkster at att.net> 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 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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>>>>>>
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```