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Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
That's a worryingly skinny secondary coil for a DRSSTC. I always thought they worked better with a short, fat coil, of the thinnest wire you can handle.
Registered Member #58
Joined: Thu Feb 09 2006, 05:40AM
Location: Tri-Cities, Washington, US
Posts: 317
Well its 28 awg wire and sch40 4inch diameter pipe at about 5ft tall, will be doing a 48inch winding for around 170khz Resonant freq + a topload for around 100khz... I hope it works alright, :( gues we will see
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Mike wrote ...
Well its 28 awg wire and sch40 4inch diameter pipe at about 5ft tall, will be doing a 48inch winding for around 170khz Resonant freq + a topload for around 100khz... I hope it works alright, :( gues we will see
I agree with Conner, you should better redo your secondary while there's still chance.
1:12 is a way too large ratio for probably any tesla coil I can think of.
It is simply that your secondary will always look silly against your spark length, it will have stability problems with large topload on top and most importantly you might use up like 10x more copper than you really need!
DRSSTC does not dissipate significant amounts of heat through the secondary and thus fine wire can be used to reduce secondary size and total amount of copper used.
For a fullbridge of 40N60 IGBT's, you can also look around Steve Ward's coils.
His DRSSTC 1 had final resonant frequency of 60kHz, and secondary that seemed to use 32..34AWG wire. , 6.5*22 inches IIRC.
I myself made a resonator with f0 of about 100kHz using 0.2mm wire (awg 32), on 110*400mm PVC pipe, and large toroid about 150*400mm.
Registered Member #58
Joined: Thu Feb 09 2006, 05:40AM
Location: Tri-Cities, Washington, US
Posts: 317
I would have tried that had i not already gotten over 5inches of winding done... I think I can make this work, though I know its not in my best interest to ignore guidance by fellow 4hv'ers, It is still a learning process and if it ends up not working correctly.. well that will be my fault and I have learned my lesson. Please keep contributing comments/concerns though, I will do what i can to use them!
Registered Member #160
Joined: Mon Feb 13 2006, 02:07AM
Location: Melbourne, Australia
Posts: 938
You know, I read the 5ft, but I thought you were saying that you would cut the excess off later. 1:12 is not a good look. Why don't you just do about 1200 turns on that one and start another secondary with finer wire?
Registered Member #58
Joined: Thu Feb 09 2006, 05:40AM
Location: Tri-Cities, Washington, US
Posts: 317
hehe, i know i shouldve gone that route, but i already finished my secondary, and if it doesnt work well than i will go get a fat tube a roll a new one... right now varnish is drying so i will post pics when its not 2am :)
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First DRSSTC 40n60 minibrick topology
