Author Topic: How many Farads should my bank have?  (Read 306 times)

Offline fpicoral

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How many Farads should my bank have?
« on: April 21, 2019, 08:41:25 PM »
Hello there!

I'm building a small Tesla coil (a little bit taller than 1 foot) and I was wondering how many Farads should my capacitor bank have to I get bigger arcs. My power supply is around 15kV (flyback from CRT tv) and I will build the capacitors (saltwater capacitors) from 16oz bottles. I was thinking about something around 10.5nF, is this enough?

Offline Fumeaux

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Re: How many Farads should my bank have?
« Reply #1 on: April 21, 2019, 09:18:09 PM »
That's not a simple yes or no question. It all depends on something. First you should match the primary frequency to the secondary frequency. Howmany bottles that may take. Then you have to experiment yourself if more bottles and less turns is better or the opposite.

Offline Teravolt

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Re: How many Farads should my bank have?
« Reply #2 on: April 22, 2019, 11:37:35 PM »
the question is how much capacitance is in 1 bottle what is the inductance in your primary and what is the resonant frequency in your secondary with topload toride. how many bottles will it take with your primary inductance to make your primary equal to your secondary frequency. caps in parallel add so you will have to make some mesurements and your flyback may have enough energy to make 2-3" sparks if you want more you will need more power.

https://www.daycounter.com/Calculators/LC-Resonance-Calculator.phtml

Offline Mads Barnkob

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Re: How many Farads should my bank have?
« Reply #3 on: April 23, 2019, 08:11:52 AM »
You should use some of the good old tools available on classictesla.com

Bottle capacitor calculator: http://classictesla.com/home/570-2/

Use the MMC calculator: http://classictesla.com/home/javammc/ and pay attention to the LTR values
Static Gap LTR Value (uF):
SRSG LTR Value (uF):

Last but certainly not least, use JavaTC to design the rest of your coil: http://classictesla.com/home/javatc/

Some good information and links on SGTC design: https://www.teslacoildesign.com/design.html also loneoceans writes some good explanations: https://www.loneoceans.com/labs/teslacoil1/

« Last Edit: April 23, 2019, 08:15:39 AM by Mads Barnkob »
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Re: How many Farads should my bank have?
« Reply #3 on: April 23, 2019, 08:11:52 AM »

 


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