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Registered Member #1143
Joined: Sun Nov 25 2007, 04:55PM
Location: Vilnius, Lithuania
Posts: 721
Hi I have half-bridge 600W fixed frequency sstc and it make 30-25cm sparks, but with 74HC14 it just 12-15cm, so i make lessen primairy (4 turns) and its was 1000W, bu spark is same length, So how to make longer spark ? maybe use full-bridge ? or make bigest vire secundary ?? any ideas ?
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Linas wrote ...
is it good for current xformer ?
I'm not sure.. I would use black ferrite instead the yellow powder core, although for CT nearly anything will work I think. You would probably be better if you made your own.
Registered Member #56
Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
That CT will not work, you need a ferrite core not a powdered iron (as is linked). It works well to just wrap ~50 turns on a core that you would use for a gate drive transformer, and pass the secondary ground wire though the center.
As to making long sparks, generally speaking the lower the duty cycle the longer the sparks will be (up to a point of course).
Also, the lower the operating frequency of the coil the longer the sparks should be.
Also, the geometry of the secondary seems to play a large part in how long of a streamer you can produce, with the small/fat resonator on my 3000w sstc I can only get about 15cm, but the sparks are extremely hot/fat.
Registered Member #146
Joined: Sun Feb 12 2006, 04:21AM
Location: Austin Tx
Posts: 1055
Its funny... many times i find tesla coils work a little better if you can detune the driving frequency. With the basic feedback coils, you are stuck driving it at whatever the secondary wants, but this isn't always what "grows" the best sparks! I think this is part of the "mystery" around VTTCs making nice long straight sparks. It mainly has to do with the power envelope of the streamer, which is based on the primary circuit operation. Its all pretty messy to emulate on a SSTC so it might just come down to luck. I found all of these factors to be annoying, so i build DRSSTCs now .
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Make Long Spark
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