My First DRSSTC

Here's a short clip of my coil putting out 3 feet or more. It does hit 4 feet and arcs to the ceiling occasionally when I turn it up. It's running on 190vac 60hz input. 15amp fuse protected. Primary is 19uH, tank cap is .5uF @ 7000vdc. Primary fres is around 56khz. Current is limited to around 450amp peak. Secondary is about 21 inch wind of 37awg wire on a 4.5 inch form. Toroid is a homemade 4.5"x18". Driver board is Steve Ward's 2005 design. I use it to drive a separate daughter board to drive the CM100DY-12H igbt's. The daughter board was dremmeled out of an inverter based welder control board. The arcs are pointed vertically because I haven't protected the electronics with wire mesh yet, nor is a strike rail installed yet. The interrupter is also Steve Ward's design. The system runs without a variac. There is a capacitor precharge circuit put together. I'd like to eventually run it on 240vac input. I would expect about 5 foot arcs. In the meantime, I need to address some interference issues with the interrupter.

Category:

Entertainment

Tags:

• Tesla
• Coil
• DRSSTC

[aquapulsefuel]

wow .that freq sound is fantastic. just as you think it can not go up further it does.i thought human ear could not hear above 25000 hz. what was this running at?

[rrolison68]

This Tesla coil resonates at around 56,000hz. This is of course beyond human ears as you pointed out. The coil is turned on and off between 120hz and up to 750hz or so. This is why you hear what you do. Typical SSTC's aren't pulsed and they are relatively quiet. Neat stuff. Hopefully I'll have it playing tunes shortly...

[bmanTCoiler]

Great work! The output looks great. Congrats on an amazing coil.

[rrolison68]

Thanks for the kind words. The interference issues are all gone now since I've switched to fiber optics for the interrupter. The output is even better now, probably due to higher stability. I'm in the works of replacing the secondary. When that's completed, I'll have a new video.

[PhxSt0rmz]

Very nice. Hope to do the same someday. The end was you powering it down right? and not a fluke? xD

[rrolison68]

Yeah, I was powering it down. Just an example of the control. I first starting lowering the duty cycle to shorten arc length. Then I turned down the BPS. Then I gave a small spurt just to show how low you can run it. :)

[bennem1]

Nice!!

You should document your project construction on the 4HV forum!

[HLSDK]

Neato neato!

[rrolison68]

I'll do that when the interrupter issue is solved. There are some interesting quirks to this coil.

[rrolison68]

My primary is 7.5 turns of 1/4" copper tubing. 9.5" I.D. It got warm after a 10 minute run. Guessing less than 100°F. Also guessing caps were less than 120°F. I only break out the infrared thermometer when things are to hot to touch. (That's about 125°F for me) The heat sink is cooled by dual muffin fans. Serious overkill. Maybe hit 10°F over room temperature. Base of the Secondary gets vewry warm. Will hafta measure that too one of these days.

[Tab54o]

wow thats nice. Any heating at all?