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By Radu Motisan Posted on September 8th, 2011 , 1080 Views
(Rate 1.73)
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This is an update to my last SGTC project, as presented here.
In just a few words, this is a SGTC, that takes 10-20V in, uses a Royer oscillator to drive a half wave rectified flyback, charges a bank of capacitors, and uses a spark gap as a relaxation oscillator to drive the primary of the tesla coil. Schematics in the original post (link above).
Some improvements:
1) The capacitor bank now uses 24x 6800pF 4KV good quality Russian capacitors (Polyethyleneterephthalate foil), as found here. The capacitors are connected for 8KV 40.8nF on a Bakelite board. The entire setup is enclosed by a PET plastic foil. The capacitors use a bleeding resistor, made of 9x10MO 0.5W resistors connected in series. Here are some pics:
2) The spark gap uses two sphere shaped screw bolts, inserted in a plastic pipe to reduce noise. As you know SGTCs can be very noisy, so this helps a bit. Ideally, I should have used a ceramic pipe, but I didn't have one. Plastic can melt on continuous use, but I had no problems so far. The spark gap distance is adjustable via a screw:
The result
November 13th, 2011 at 10:20 pm
I Have constructed [3] ZVS LOPT Drivers all of which Work reliably. The First [2] Using IRFP250 The 3rd Using Your Schematic. I have also Constructed a Small 250’000V [Approx]. Tesla Coil Using An MMC Array /and OBT Supply [6-7.5KV] This is not Perfect but produces nice Streamers….. I Decided After Building A UV-Laser using A LOPT and Plate Cap. That I Felt Curious About Building Your Tesla Coil Design
After Building It with Some Slight Differences in construction -The capacitors Being Slightly Bigger But With Less In a String ====/==== [=]40nf@8KV -on ignition and going for the longest arcs [drawing more power]? The caps Blow, a String of them ….I Change them Another String Blows[ My????????? Is My Output Voltage To Large For The MMC [The Caps Are The PETP Russian .01uf@4Kv X [16] Would Appreciate Your Input —By the way I Enjoyed building the Induction Heater It’s A Gem!
March 20th, 2012 at 1:03 pm
Dear Andy!
as you primary voltage is 7.5kv approx
you should have altleast double the voltage as you input voltage.
make tank cap that can handle approx 16kv
.
it will work fine.
faisal
xynosine@yahoo.com