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Registered Member #33
Joined: Sat Feb 04 2006, 01:31PM
Location: Norway
Posts: 971
Good summary Eric, though I would say it's opposite. The bus voltage waveform is the primary deciding factor, without a relatively slow ramp, there won't be any sword sparks at all. And the resonant frequency is the factor deciding how straight sparks you can get. I'm sorry if I'm misunderstanding you, and this is what you meant.
Have you ever tried running your QCW coil directly from half-wave rectified mains? I think this was what Steve Ward did early on, before he made the bus voltage modulator.
Registered Member #2292
Joined: Fri Aug 14 2009, 05:33PM
Location: The Wild West AKA Arizona
Posts: 795
Anders M. wrote ...
Good summary Eric, though I would say it's opposite. The bus voltage waveform is the primary deciding factor, without a relatively slow ramp, there won't be any sword sparks at all. And the resonant frequency is the factor deciding how straight sparks you can get. I'm sorry if I'm misunderstanding you, and this is what you meant.
Have you ever tried running your QCW coil directly from half-wave rectified mains? I think this was what Steve Ward did early on, before he made the bus voltage modulator.
You got it right, you need a slow ramp to make the long sparks. But resonator frequency dose play a big part in getting the real strait sparks. You need a high resonant frequency or they will branch more.
I did at one point try "leave shifted" mains like a VTTC but because the mains cycle can only give you a ramp that is at most like 6 to 8mS long you are limited to how strait of a spark you can get.
If you want the really strait long sparks as in the QCW you need a high resonant frequency 350KHz+ and you need to control the bus voltage. Just look at a VTTC that runs on almost exactly the same principle but uses tubes rather than silicon. VTTC have a high resonant frequency 300KHz+ high Z (for low primary current) and the supply voltage is given ether leave shifted of half rec mains ie a ramp.
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