Re: Perfecting my final design...

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "S&JY" <youngsters@xxxxxxxxxxxxxxx>

Chris,

Your MO caps are likely to get very hot and explode if you use them for
primary tank caps.  The dielectric is too lossy to be used at higher
frequencies.  But as you suggested, they are fine for filters in DC power
supplies and in voltage multipliers.

Note the voltage rating of microwave caps is usually rated for RMS AC
voltage.  Their DC rating would be be the same as the peak AC voltage, or
about 1.4 times 2500 = 3500 volts for your caps.

Check with Dr. Resonance for MMC caps.  I use strings of 0.1 uF 3 KV caps I
purchased from him, and they work really well.
--Steve Y.

----- Original Message -----
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Tuesday, June 14, 2005 5:07 PM
Subject: Re: Perfecting my final design...


> Original poster: "Chris Rutherford" <chris1@xxxxxxxxxxxxxxxxxxx>
>
> I can't answer your question, but I'm slowly building/designing my first
> Tesla coil, unfortunately I *may* have just waited about $200 on some
> capacitors that may be useless.  I purchased 10 * 2500V 1.3uF microwave
> capacitors, they charge up nicely and produce a nice crack when
discharged,
> except when thinking about their make up (liquid filled) and their 50Hz
> frequency rating, when I start to pulse them in the Khz range they may
> start to heat up due to losses etc.  Can anyone advise?  If they're no
good
> as high voltage pulse capacitors would they be any good in a voltage
> multiplier circuit to drive a pulse capacitor? Or should I just use 4 *
4KV
> transformers with secondary in series??  Any ideas what I can do with 10 *
> 2500V 1.3uF 50Hz capacitors in relation to making a Tesla coil??
>
> Thanks
>
> Christopher
>
> ----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
> To: <tesla@xxxxxxxxxx>
> Sent: Tuesday, June 14, 2005 7:02 PM
> Subject: Re: Perfecting my final design...
>
>
> >Original poster: "Adam R." <arabraxas@xxxxxxxxxxx>
> >
> >
> >I'd like to go with a large cap but I just expanded it! I am using the CD
> >caps (2000v .15uF) and have two strings of 15 for a .02uF cap bank
> >total...it does not look like I can easily get some more of those caps
> >(cheaply).
> >
> >Here are the results of the spread sheet, the inductance is much higher
> >than I thought.
> >
> >Diameter of tubing 0.25
> >separation of turns 0.25
> >Number of turns per spiral 10
> >Radius inner turn 4
> >Separation of spirals 2
> >length     TOTAL 2.5
> >n            TOTAL 100
> >L            TOTAL 3003.5
> >
> >Also, shouldn't the two spirals be wound in opposite directions so the
> >magnetic field matches?
> >
> >I'm worried working with the acrylic: I don't have special bits to drill
> >with it or saw it so I hope when drilling it won't crack and its only
1/4"
> >thick. To hold the copper tubing in I'm using PE cutting board strips.
How
> >can I bolt the PE down? I'm guessing just extand 1/8" nylon bolts on the
> >strips.
> >
> >The distances btw the two coils will be adjustable so I can experiment
> >differing setups.
> >
> >Even just using two layers of 5 turns (6 or even 6.5"dia center) of .25"
> >Cu tubing spaced .25" apart (hopefully enough room to put 1/8" bolts?)
> >sounds like it'd work (with the .02uF cap). I'm just worried about using
> >thin bolts (1/8") but then that'd lower the risk of fracturing the
> >acrylic. (However, the center holes for the secondary are 1/4")....so
> >should I shoot for 5 turns? I might even be able to make a crappy mock
> >setup and test it with my L meter.
> >
> >
>
>
>
>
>