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Re: [TCML] Capacitor calculator?
Hi Brian,
I use a Leyden jar battery with my coils. The way I do it, I make a sample
single jar and test its capacitance with a handheld meter. I make few more
and test them to make sure I'm getting consistent results. For example, I
make a dry jar using polypropylene canisters and aluminum soda cans that
always clocks in at 450 to 500 pF. By linking a bunch of these in parallel I
get the capacitance I want. See
http://www.instructables.com/id/Soda_Can_Leyden_Jar/
I don't make salt water jars. Liquids are heavy and messy, and I worry about
glass breakage. I've never had one of my homemade Leyden jars break, melt,
or arc over. Based on spark length when charged with my Wimshurst machine, I
estimate the voltage rating of my jars at 100 KV.
Regards,
Paul Thompson
----- Original Message -----
From: "Brian Hall" <brianh4242@xxxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Wednesday, September 16, 2009 12:12 PM
Subject: [TCML] Capacitor calculator?
Does anyone know of a link to a good site (or what the formulas are) for
calculating the capacitance AND max voltage of a leyden jar/saltwater
cap/stack of alternating styrofoam cups and tin foil type cap? Container
dimensions, sueface area of conductor if it matters, etc.
And for the saltwater leyden jar, how does one figure out the teaspoons of
salt to ounces/some standard measurement of water ratio in terms of how it
affects the capacitance and max voltage? I have made a small TC with
snapple bottle saltwater caps in series, and got lucky with random guessing
to get nice bright 1" sparks ... but I have a bigger coil under construction
now. I know they can be lossy and messy if spilled but I know they work.
----------------------------------
Brian Hall
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