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# Re: [TCML] MMC

```Hey Mitch...

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first off... if you have a power supply of 10KV, then you should have a minimum of 1.5X that voltage as needed for your caps.. preferably 2X the supply voltage.
```e.g. 15KV or 20KV cap voltage capacity.

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the metalized caps ( if they are polypropelyne filmed) seem to be a good choice ( self healing good peak current rating)
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dont wory about a .0001 uF difference... that can be made up by changing the tap point on the primary and as usual, the tolerances of caps are not that tight to begin with... you are worried about one teaspoon compared to a gallon of water.
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What you really need to consider is what capacitance can be "filled" to full volume by your power supply in the time it needs to be filled for the maximum burst of energy when the spark gap conducts.
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I love using water as an analogy...  here it goes..

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the power supply ( a water hose) has a certian capacity to fill a volume per second. Lets say yours is capable of filling a container ( cap) of 1 gallon per second, naturally you want to use a container that can hold 1 gallon, anything bigger is not being used to its "fullest" potential. anything less will result in a capacity to fill faster, but you still have to wait that 1 full second before you can use it. To make the best of the time/capacity usage, match the cap to the supply "volume" plus you need to consider that the container is more like a water balloon... to much pressure ( voltage ) and the balloon bursts.
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Voltage has 2 readings, an average ( rms) and a peak in US its 120Vac and about 168 Vac respectively. Plug a meter into the socket and you will see 120 ( in most cases) place an O-Scope into the wall socket and you will see a 160ish peak voltage ( BE CAREFUL doing this, it can blow the O-scope if not done right!)
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Look up JavaTC and play with it to see what best cap size works for your supply.... the power supply and cap are the 2 first functions to deal with in designing a coil, the primary and secondary can be made to "fit" the rest of the parameters!
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then design your coil around those parameters...

Scot D

Mitch Newman wrote:

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```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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