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4hv.org :: Forums :: Tesla Coils
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The Lightning Stalker
Sat Mar 16 2019, 05:19AM Print
The Lightning Stalker Registered Member #4230 Joined: Sat Nov 26 2011, 05:50AM
Location: Socketville
Posts: 53
I don't have anywhere else currently to release this so I'm putting it here. This is still just a preliminary drawing and has not been tested.
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The Lightning Stalker
Sat Mar 16 2019, 05:25AM
The Lightning Stalker Registered Member #4230 Joined: Sat Nov 26 2011, 05:50AM
Location: Socketville
Posts: 53
Of course the image uploading is broken.
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The Lightning Stalker
Sat Mar 16 2019, 05:26AM
The Lightning Stalker Registered Member #4230 Joined: Sat Nov 26 2011, 05:50AM
Location: Socketville
Posts: 53
Ok try this

H5jSQLp
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Hazmatt_(The Underdog)
Sat Mar 16 2019, 04:08PM
Hazmatt_(The Underdog) Registered Member #135 Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735
You need to add an oscillator to the input, the oscillator is not going to self-start, and Ctank needs to go away, or go in parallel to the primary.
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Patrick Konesky
Sun Mar 17 2019, 04:27AM
Patrick Konesky Registered Member #65366 Joined: Mon Oct 08 2018, 05:01AM
Location:
Posts: 10
Isn’t that a current sense transformer? It might oscillate but with a bad phase shift.
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Hazmatt_(The Underdog)
Sun Mar 17 2019, 09:53PM
Hazmatt_(The Underdog) Registered Member #135 Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735
It's the base return of his coil primary that he's using as feedback to steer the oscillator, but at turn-on there is no feedback.
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The Lightning Stalker
Tue Mar 19 2019, 09:02AM
The Lightning Stalker Registered Member #4230 Joined: Sat Nov 26 2011, 05:50AM
Location: Socketville
Posts: 53
The pot and resistor are there to provide startup bias.
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hen918
Tue Mar 19 2019, 04:37PM
hen918 Registered Member #11591 Joined: Wed Mar 20 2013, 08:20PM
Location: UK
Posts: 556
As far as I can see the phase between input and output is inverted, i.e. the dots need to be the other way, and I'm not sure the dv/dt of the turn on will be enough to kick the input the other way to start the oscillation.
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The Lightning Stalker
Wed Mar 20 2019, 08:01AM
The Lightning Stalker Registered Member #4230 Joined: Sat Nov 26 2011, 05:50AM
Location: Socketville
Posts: 53
The N/P follower is non-inverting, so it should be in phase.
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2Spoons
Wed Mar 20 2019, 09:12PM
2Spoons Registered Member #2939 Joined: Fri Jun 25 2010, 04:25AM
Location:
Posts: 615
I would have thought you need more gain in the loop to ensure oscillation. Also what are you doing with that 2n2222 at the bottom of the bias chain? Is that meant to be a constant current bias? Because thats a horribly unstable way to do that - depends heavily on the transistor gain and temperature. You would be better off with just a resistor.
Also startup is more likely if you were to bias your follower into class AB.
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