Author Topic: Bigger sparks?...  (Read 682 times)

Offline Teslaventje

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Bigger sparks?...
« on: June 10, 2024, 11:05:55 PM »
I recently build a GU50 driven Tesla coil resonating at about 260KHZ for the prim and sec coil.
The prim coil has about 40 windings with the caps resonating at 260KHz. I wonder if I will get bigger sparks at less windings on the prim and still fit caps to resonate at 260KHz?...

Offline MRMILSTAR

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Re: Bigger sparks?...
« Reply #1 on: June 11, 2024, 05:36:46 AM »
If you lower the primary coil inductance (fewer turns) you will have to raise the capacitance to maintain the same resonant frequency. You can use JAVATC to determine design parameters. I don't see how this will affect your spark length. Spark length is determined by input power.
Steve White
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Retired electrical engineer

Offline Teslaventje

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Re: Bigger sparks?...
« Reply #2 on: June 11, 2024, 11:05:49 PM »
I understand the resonance...But I wonder if the turn ratio of the coils wil result in a higher transformation in voltage and thus larger sparks?

Offline davekni

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Re: Bigger sparks?...
« Reply #3 on: June 12, 2024, 03:32:22 AM »
Quote
I understand the resonance...But I wonder if the turn ratio of the coils wil result in a higher transformation in voltage and thus larger sparks?
Sparks might get larger or smaller.  Depends on how well coil load impedance matches GU50's drive capability.  Your GU50 circuit has an optimum load impedance determined by drive current and voltage.  If your TC has too high impedance now, lowering it will allow GU50 to transfer more power to coil.  If existing TC impedance is too low, then lowering it further will reduce power transfer.
I find it difficult to know ahead of time what impedance a given TC presents to a drive circuit.  If wire resistance were zero (ignored) and no arc present, then the primary impedance at a resonant frequencies is either zero or infinite.  Between resonant frequencies, impedance is purely reactive.  Arc resistance makes impedance non-zero and non-infinite at resonant frequencies.  Arc size affects impedance.  Impedance affects power transfer and therefore affects arc size.
Finding optimum is a matter of experiment.  You can get close by comparing other similar coil designs posted to this forum or elsewhere.
David Knierim

Offline Teslaventje

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Re: Bigger sparks?...
« Reply #4 on: June 13, 2024, 08:50:56 PM »
Understood.....See what I can do.....Thanks for the input

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Re: Bigger sparks?...
« Reply #4 on: June 13, 2024, 08:50:56 PM »

 


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