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Re: [TCML] Primary selfC
Hi Bart,
I would have expected a few pF but not in the nF range.. I've built caps
myself and the maths always works out great on those, even my rolled caps..
The typo was ( I assume )
x = number of stacked sheets of dielectric between plates (1 in
this case)
Where you put "1 inch" which confused the other chap, but I was talking "
1mm" gap....
Chris
----- Original Message -----
From: "bartb" <bartb@xxxxxxxxxxxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Saturday, July 26, 2008 3:26 AM
Subject: Re: [TCML] Primary selfC
Hi Chris,
Granted for a rolled cap situation, N = 3. But in a primary, use 2. This
is what I was trying to state in my correction to the list. A rolled cap
has 2 sheets rolled up. But a primary is a single sheet. So, say 5nF which
is somewhat close to my calcs. But I agree with Phil, it is extremely high
for what anyone would expect. However, let us say we had a 2 plate
capacitor of 600 square inches separated by 1mm (or .03937 inches), then
what? Would we assume then the basic plate cap formula is wrong? It's
worked just fine for other plate caps, why would it be wrong here?
I'm not saying it's correct, I'm asking the question to anyone who might
have insight. BTW, you mentioned a typo. Can you specify?
Take care,
Bart
Chris Swinson wrote:
Phil,
C = 0.2248*k*A*(N-1)/(d*x) (in pF)
where
k = Dielectric constant (1.0006 for air)
A = Effective plate area in square inches (length x width)
N = Number of conductive plates (3 for a rolled cap)
d = individual dielectric film thickness (.03937" in this case)
x = number of stacked sheets of dielectric between plates (1 in
this case)
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