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4hv.org :: Forums :: Tesla Coils
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Skori coil humming, why?

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Ken M.
Tue Jan 01 2008, 08:59PM
Ken M. Registered Member #618 Joined: Sat Mar 31 2007, 04:15AM
Location: Us-Great Lakes
Posts: 628
Uzzor, i tried it at 12v and it still doesn't work, also before the ps I was using a workbench ps at 30v 3A and it ran fine. AS for the semi's the 555 sends out a good square wave, the buz11 right after the 555 inverts the wave and its still a good square wave, and its a goodsquare wave into both fets, when I scope the connection at d5 and d6 and its a ramp wave form like a cap charge and discharge cycle, when I measure from the drains of the fets then the wave form gets all ripply, when its not connected to the primary.
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uzzors2k
Wed Jan 02 2008, 11:21AM
uzzors2k Registered Member #95 Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308
That proves the interrupter is working. You say the primary wire melts, which implies it is carrying lots of current. So either your primary drive fets are short, or the snubber system. Have you checked those too? Take scopeshots of the BUZ11 gates and drains. They should have a high frequency square-wave on them, modulated by the low frequency interrupter.
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Ken M.
Fri Mar 28 2008, 05:17AM
Ken M. Registered Member #618 Joined: Sat Mar 31 2007, 04:15AM
Location: Us-Great Lakes
Posts: 628
Since getting my new scope I thought I'd try it out on setting up the class E and Class E\F coil, but soon realized I didn't have the inductor I needed So I decided to try and see if I could fix the skori coil.

To jog folks's memory Most of us who watch Youtube know Skori as, Link2, for details here's his website with Schematic, parts list in both semi english and I think Chek Link2, after observing on a few of his pics and one or two of his videos I spotted my 1st mess up on the circuits interpretation ( or at least I think) originally I thought his primary was like this
Primarywrong
, then basic coil theory ran threw my mind, if you have 2 coils going in a parallel fashion your not going to get a bigger voltage, so then I switched the primary to the correct way
RightPrimary
, However I still had the problem with primary wires heating and melting the insulation. So I figured I'd take some scope shots and make a more thought out post with better descriptions and more info.

Anyways The interrupter works heres the Scope shot of the 555's output and after its gone through T4
Intpulse
, Then here's the wave forms at both T2 and T3's gates
Gatewaves
, Now here is where the waveforms get real messed up, this next one is of the Gnd clamps of the scope probes are connected to the drains of T2 and T3 respectively and the probe themselves are connected to the (+) wire that leads up to the primary
Polarity
, this next one is what the wave forms look like if I switch the probes and their ground clamps
Revpolarity
. Now In uzzors last post he said test the snubber How would I check the snuber and\or where and which parts the active parts or the passive parts and this is the snuber part of the circuit correct?
Snuber


Oh almost forgot all scope shots are without the coil connected!
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uzzors2k
Fri Mar 28 2008, 06:19PM
uzzors2k Registered Member #95 Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308
Disconnect the interrupter, that'll make testing easier. In the first picture, is that how you had the primary wound? The windings have to be out of phase to work, so wind one winding and tap it in the center like in the second pic. Give us the gate/source waveform of one mosfet, with no interrupter running/ disconnected, that will be enough to confirm/disprove any suspicions.
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Ken M.
Fri Mar 28 2008, 07:57PM
Ken M. Registered Member #618 Joined: Sat Mar 31 2007, 04:15AM
Location: Us-Great Lakes
Posts: 628
Yes the 1st picture is the way my Primary was. Here is the requested wave form shot (its actually both G-S) with no Interrupter and with the Primary connected.

S

I thought I'd take a Scope shot of G-s with the interrupter and the TC connected.

S

Also to note In both cases With the scope probes connceted the coil ran fine.
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Ultra7
Fri Mar 28 2008, 08:18PM
Ultra7 Registered Member #1157 Joined: Thu Dec 06 2007, 12:11PM
Location: Houston, TX
Posts: 307
I see he has some of the site in English, but babelfish doesn't do Hungarian.
How were you able to figure out the primary winding?

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Ken M.
Fri Mar 28 2008, 08:40PM
Ken M. Registered Member #618 Joined: Sat Mar 31 2007, 04:15AM
Location: Us-Great Lakes
Posts: 628
In a post on here they had some of the stuff translated, But I kinda watched some of the videos on his site that showed the primary.
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