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RE: [TCML] MMC
In addition to the concerns raised by others regarding the overall voltage rating of the string, also know that there is a good deal more to a capacitor being suitable for a Tesla coil than just voltage and uF ratings. The dielectric material is critically important. Metalized poly is an incomplete description. Poly-what? Polypropylene is good, polyester (a.k.a. Mylar) is not. And beyond dielectric material, the mechanical construction of the plates is critical. To survive the high currents encountered in TC's, we need a foil plate construction. I think that metalized film refers to a vacuum-deposition of extremely thin aluminum, which would fail quickly in any but the lowest power coils.
If you can provide a link to the part you're looking at, we may be able to more accurately access how suitable it is. But unfortunately, suitable caps are rarely found commonly or cheaply.
Regards, Gary Lau
> -----Original Message-----
> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
> Behalf Of Mitch Newman
> Sent: Sunday, May 10, 2009 5:37 AM
> To: tesla mailing list
> Subject: [TCML] MMC
> Hi all,
> As some of you may know, i am new to the Tesla world.But i wanted to know,
> because some of the materials used in the Tesla coil can be hard to find i just
> wanted to know if i could use "20 X 0.47 uF / 1000 V. METALLISED POLY AXIAL
> CAPACITORS" set up in 2 stings of 10 (caps) set up in parallel, to reach the
> 0.0095uF, 10kv that the output of a 10kv, 30ma, NST.but the NST needs 0.0095uF
> for the capacitors but, using the MMC calculator on "DeepFriedNeon.com" the
> capacitance of those capacitors wired up in two strings in parallel (10 caps each) it
> comes to 10kv and 0.0094uF.
> Will that make a major problem being the capacitance off by 0.0001or will it be fine
> like that ?
> Thanks heaps,Mitch ~ Gb
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