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4hv.org :: Forums :: Tesla Coils
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Another SSTC question

Move Thread LAN_403
Dr. Dark Current
Sat Oct 03 2009, 11:31AM Print
Dr. Dark Current Registered Member #152 Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
When the electronics are directly under the primary/secondary (a few cm below), is there any risk of induced HF voltages on the driver circuits, which could upset the operation of the SSTC?

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Mads Barnkob
Sat Oct 03 2009, 11:49AM
Mads Barnkob Registered Member #1403 Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
My SSTCs get unstable at voltages above 100VAC in if the drivers are not shielded, I just use some thin metal sheet I salvaged from a old monitor, bend into a case and grounded.

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Dr. Dark Current
Sun Oct 04 2009, 08:49AM
Dr. Dark Current Registered Member #152 Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Would work putting the electronics inside a PC PSU case?

How far from case should I put the primary/secondary, to not turn the case into an induction heater? tongue

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Mads Barnkob
Sun Oct 04 2009, 09:56AM
Mads Barnkob Registered Member #1403 Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
Dr. Kilovolt wrote ...

Would work putting the electronics inside a PC PSU case?

How far from case should I put the primary/secondary, to not turn the case into an induction heater? tongue



You can always look at the holes in the casing and calculate which wavelengths it will shield for, more layers with different grid sizes would be perfect, but for a SSTC it will do fine, I have my drivers box about 10 cm beneath the secondary/primary.
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teravolt
Sun Oct 04 2009, 04:34PM
teravolt Registered Member #195 Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
a PSU should work good and if you are unshure about about EMI than you could put a metal mesh like for screan doors in front of the fan and aluminuim or copper tape for holes. but a PSU case might offer enough shielding with out all of that.
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