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Registered Member #952
Joined: Mon Aug 13 2007, 11:07AM
Location: Finland
Posts: 388
Hi!
I'm building a really small SSTC. I'm gonna the whole with a 9V rechargeable battery. I've tried Steve Ward's Micro circuit so far, but it seems not to work. So what circuit would you suggest for building such small Tesla coil? The Fres of the secondary is something between 5 and 8 MHz. I'm interested in Steve Conner's PLL circuit. Would it work well with this kind of small tesla coil? And is it absolutely necessary to use a GDT for this kind of small voltage design? Can I replace the the gate drive chips with 2N2222/2N2905 totem poles?
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Well.. the power available from 9V is very low, and small coils tend to produce shorter sparks at the same power as bigger ones... SO if you want to get at least small sparks, you'll have to use interrupter with very short ON time and you'll probably need less than 1 primary turn- how to go around this I don't know...
Registered Member #952
Joined: Mon Aug 13 2007, 11:07AM
Location: Finland
Posts: 388
Hmm, what about adding an interrupter to that circuit? How could it be done? And Lomy, that seems to be a Class-E coil, or am I wrong? I haven't found much information for tuning the class e capacitor. Are there any simple rules of thumb or formulas to tune the capacitor? And bd139 and bd140 can be replaced with 2n2222 and 2n2905?
Registered Member #789
Joined: Sun May 20 2007, 09:32AM
Location:
Posts: 21
mh first its very very very esay to add an interrupter: see the second gate of the 4093 ? instead of 12v, u use it as interrupter input and it works great. then to tune E-class exactly isnt very easy, but u can test some caps. my coil has an ~2nF cap
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Help needed for building a really small SSTC
