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Joined: Sat Feb 16 2008, 03:22AM
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In my case I'm using a TSC Intl. double "U" core, part# 102-57-25 (x2), with "50All" ferrite material which has a permeability of 3000 and Al of about 7800 nH/turn^2 or something like that. (Ferroxcube makes an almost identical part, but with their 3C90 material, you get 5500 nH/turn^2).
BTW I found a decent online gapped-core inductance calculator here:
So if I'm not mistaken, if I were to put 52 turns on the primary of my core, I'd have an inductance of about 21 mH, and I estimate the leakage inductance would be in the range of about 500 uH or something like that (assuming a coupling factor of about 0.975).
For a frequency of 25 kHz, C would be 0.002 uF and the Q of the primary circuit would be about 0.0003*R, where R is the load resistance referred to the primary.
So somewhere between a load drawing 100 to 200 watts, the Q will drop below 1.
I think "Microwave89" said that during arcing he was drawing 3kw or something like that. So in my case that would be about 179 ohms shunted across the primary inductance of 21 mh and the Q would be about 0.05.
Maybe I'm looking at everything all wrong, but it seems it would stop oscillating before getting to this point.
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Circuit Maker Simulation of Modified "Mazzilli" Driver
