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Registered Member #146
Joined: Sun Feb 12 2006, 04:21AM
Location: Austin Tx
Posts: 1055
Sure is possible.
You want to run a TC off of it? Keep in mind that working with HVDC supplies like this require some other components to make them work with TCs. You will need some sort of choke (inductor) between the HVDC and the TC circuit, otherwise when the spark gap fires it will discharge your voltage doubler capacitors. The inductor "isolates" the 2 circuits to some degree, keeping this from happening. The inductor is very large value, probably the reason many people DONT run DC supplied tesla coils.
My NST isn't powerful enough for my coil. If there is a doubler for it, (SGTC failcoil) I need it, as my SGTC is more of an air cored NON-RESONANT transformer XD
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
jameselectric wrote ...
just wondering if this is possible like with a mot and the diodes and whatnot?
Yes, of course it is possible. The reason that it is rarely done is because of the considerable cost and physical size of the capacitors needed in 50/60 Hz voltage multipliers.
It can still be viable if only a few mA or less are required - but not a lot of use to Tesla folk.
Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
jameselectric wrote ...
just wondering if this is possible like with a mot and the diodes and whatnot?
Where does the MOT come in exactly?
There is no point in using a voltage multiplier with an NST for a Tesla coil. More voltage means you would need a bigger spark gap, which i think would be less efficient. It would dissipate more heat i would think.
With a voltage multiplier for a Tesla coil power supply, you would have to use a high voltage choke, which would have to be very very high voltage, especially due to the high voltage from an NST with a doubler. The choke would have to be rated for around 2 times the voltage of the supply, and then with higher voltage you would need more inductance. That would be insanely expensive. If you where doubling a 12kv NST, the choke would have to be something like 40kv and probably 20-40H, which i don't know if they even make those. Winding one would suck.
Registered Member #2919
Joined: Fri Jun 11 2010, 06:30PM
Location: Cambridge, MA
Posts: 652
Arcstarter wrote ...
jameselectric wrote ...
just wondering if this is possible like with a mot and the diodes and whatnot?
Where does the MOT come in exactly?
There is no point in using a voltage multiplier with an NST for a Tesla coil. More voltage means you would need a bigger spark gap, which i think would be less efficient. It would dissipate more heat i would think.
With a voltage multiplier for a Tesla coil power supply, you would have to use a high voltage choke, which would have to be very very high voltage, especially due to the high voltage from an NST with a doubler. The choke would have to be rated for around 2 times the voltage of the supply, and then with higher voltage you would need more inductance. That would be insanely expensive. If you where doubling a 12kv NST, the choke would have to be something like 40kv and probably 20-40H, which i don't know if they even make those. Winding one would suck.
It matters for a MOT, where the stock voltage is too low to trigger a spark gap reliably.
Registered Member #2893
Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242
HighVoltageChick wrote ...
My NST isn't powerful enough for my coil. If there is a doubler for it, (SGTC failcoil) I need it, as my SGTC is more of an air cored NON-RESONANT transformer XD
Make it resonant and you'll find that an NST can make a rather impressive coil.
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nst voltage doubler
