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@xxxxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx> 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@xxxxxxx> wrote:Jim - Still something wrong with your math ......Assuming two series-connected .5uF capacitors per string, each string willhave 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 beenreading. 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 youarrive 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 capsFirst thing: i cannot be held responsible for anything you do with yourcapacitors, 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 alittle 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 agoogle 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 morerobustend 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 asturdyenclosure 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 heardthatthey are used in voltage doublers and filters, but is there anotherprojectI 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 _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxxxxxx http://www.pupman.com/mailman/listinfo/tesla _______________________________________________Tesla mailing list Tesla@xxxxxxxxxxxxxx http://www.pupman.com/mailman/listinfo/tesla _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxxxxxx http://www.pupman.com/mailman/listinfo/tesla_______________________________________________ Tesla mailing list Tesla@xxxxxxxxxxxxxx http://www.pupman.com/mailman/listinfo/tesla _______________________________________________Tesla mailing list Tesla@xxxxxxxxxxxxxx http://www.pupman.com/mailman/listinfo/tesla _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxxxxxx http://www.pupman.com/mailman/listinfo/tesla_______________________________________________ Tesla mailing list Tesla@xxxxxxxxxxxxxx http://www.pupman.com/mailman/listinfo/tesla_______________________________________________ Tesla mailing list Tesla@xxxxxxxxxxxxxxhttp://www.pupman.com/mailman/listinfo/tesla
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