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4hv.org :: Forums :: Tesla Coils
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sstc output reduce's when object near streamers. (solved!!)

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Duality
Mon Sept 27 2010, 02:30PM Print
Duality Registered Member #1951 Joined: Sun Feb 01 2009, 01:59PM
Location:
Posts: 105
hello i have build a sstc this design:

Link2

so i got it all working, put two mosfet's in the circuit the mosfet's die.
put new one's in and it worked got sparks.
now i want to put a metal object near it. but as soon as i put a screwdriver (grounded ofcourse) near the output, it's output begins to crackle, sounds like it's detuning it's self, but it's feedback driven so how can that happen?
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HV Enthusiast
Mon Sept 27 2010, 03:18PM
HV Enthusiast Registered Member #15 Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
Because you are likely disturbing the feedback or altering it somehow.

Perhaps try moving the antenna to another location and retrying.
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Duality
Mon Sept 27 2010, 04:21PM
Duality Registered Member #1951 Joined: Sun Feb 01 2009, 01:59PM
Location:
Posts: 105
quick note i forgot to tell, that i used a feedback transformer like in this circuit:
Link2

and i wound it on a ferrite radio core.

so i don't have a antenna witch i could disturb by putting something in between.
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dingo27
Mon Sept 27 2010, 06:33PM
dingo27 Registered Member #890 Joined: Tue Jul 10 2007, 10:06PM
Location: Slovakia
Posts: 180
how many turns your feedback trafo has?
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Duality
Mon Sept 27 2010, 07:00PM
Duality Registered Member #1951 Joined: Sun Feb 01 2009, 01:59PM
Location:
Posts: 105
primary 10 turns, secondary 60 turns.
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Dr. Dark Current
Mon Sept 27 2010, 07:46PM
Dr. Dark Current Registered Member #152 Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
if you try to draw arcs from the secondary, you kill the resonant rise, the secondary current doesnt return to zero and the oscillation stops until the next interrupter pulse.
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Duality
Mon Sept 27 2010, 08:50PM
Duality Registered Member #1951 Joined: Sun Feb 01 2009, 01:59PM
Location:
Posts: 105
ah, and is there a way to fix this?
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Dr. Dark Current
Mon Sept 27 2010, 09:03PM
Dr. Dark Current Registered Member #152 Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
yes, its called a PLL wink
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Matt Edwards
Tue Sept 28 2010, 06:15AM
Matt Edwards Registered Member #2838 Joined: Fri Apr 30 2010, 07:55PM
Location: tehachapi, CA
Posts: 333
Remember that surrounding objects will affect the resonant frequency of the coil. This may be part of what you are experiencing.
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Dr. Dark Current
Tue Sept 28 2010, 11:16AM
Dr. Dark Current Registered Member #152 Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Oidium45: He is using feedback so the coil tunes to the resonant frequency.
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