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4hv.org :: Forums :: Tesla Coils
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Do all 2 transistor / 24V SSTC's have to use flyback transformers?

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Ken M.
Mon Nov 01 2010, 06:13AM
Ken M. Registered Member #618 Joined: Sat Mar 31 2007, 04:15AM
Location: Us-Great Lakes
Posts: 628
You do have it wired up ( the primary) as a 2 turn with a center tap and each transistors output tied to each end of the coil with + in the middle, and using 24v+ right?
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Steve Hobley
Mon Nov 01 2010, 12:01PM
Steve Hobley Registered Member #1731 Joined: Thu Oct 02 2008, 02:22PM
Location: Indiana
Posts: 52
As far as I can tell - yes it is wired up correctly.

At one point I even had a dual channel trace showing the two signals (one for each of L1 and L2) with the high frequency component inverted with respect to each other. So I *think* it's working correctly.

The 555 is firing a 1ms pulse in the 50 - 100 Hz range which is running through the first Mosfet and on to the other two.

Since it runs the 555 timer from the power line, I can't go any higher than 15v on the supply. But it is supposed to work with 12v.

Since this is my first SSTC - I was wondering if someone could validate the design - or give me some test points to try. There do seem to be a lot of diodes, and I'm not really sure why.

...and I still don't fully grasp *how* the feedback circuit is being used to control the output of the two main MOSFETS.


Steve
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dingo27
Mon Nov 01 2010, 04:04PM
dingo27 Registered Member #890 Joined: Tue Jul 10 2007, 10:06PM
Location: Slovakia
Posts: 180
Did you measure how much V is putting your psu when you run TC? It dont have to be 12V always, it can be also 3V, it depends on how powerful and good it is...

Also, if no breakout, does it light fluorescent tubes?
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Tesla Fan
Mon Nov 01 2010, 05:20PM
Tesla Fan Registered Member #3353 Joined: Sat Oct 23 2010, 11:21PM
Location: Greece
Posts: 90
Hi,

This guy Link2 tryied the same basic schematic with a few mods and got it working.

Hope it helps
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Steve Hobley
Sat Nov 06 2010, 04:50AM
Steve Hobley Registered Member #1731 Joined: Thu Oct 02 2008, 02:22PM
Location: Indiana
Posts: 52
I finally managed to get it working...

Link2

Turns out there were some very iffy connections on my PCB.
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Ken M.
Sat Nov 06 2010, 09:22PM
Ken M. Registered Member #618 Joined: Sat Mar 31 2007, 04:15AM
Location: Us-Great Lakes
Posts: 628
Congrats, Glad to see you get the little bugger running.
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