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Registered Member #55219
Joined: Tue Jun 09 2015, 11:21PM
Location:
Posts: 80
The 3055t does pretty well with 2 in parallel, I went up to 4 in parallel, but they failed in a short amount of time.. Even better is the 2n3055 (button style), as with above 2 in parallel work nicely... The best Single transistor one I had used a 2sc47** from an old tv... I pulled 3" arcs from it before a spike/heat killed it..
Registered Member #54263
Joined: Thu Jan 15 2015, 09:54AM
Location: Perth
Posts: 35
In Russia we call this 'kacher'. Actually it is a direct-feedback SSTC. Take it to e-klasse and you can get streamers as long as 1 - 1.5 lengths of secondary winding lengths.
Registered Member #55219
Joined: Tue Jun 09 2015, 11:21PM
Location:
Posts: 80
Here is a fairly efficient driverless mosfet design, It is not quite Class E and can run continuous , but performs well/better with an interrupter such as 555 timer with < 10% duty cycle.. There is a thread here by Shaunn(?) i'll link the youtube vid of his...
Registered Member #55219
Joined: Tue Jun 09 2015, 11:21PM
Location:
Posts: 80
Patric wrote ...
Patric wrote ...
My last power transistor is exploded. Little pause. I'll be back!
I tried with a mosfet, and it worked too! But becomes rather warm...
I think this setup while working probably leaves the fet in the linear region thus adding losses/heat ... Be sure to protect you gates! EDIT:: Also with the pic I provided, The primary coil likes to have a lot of turns, start with say 15 then adjust from there, removing one or 2 at a time, even better is a bifilar winding with 5-7 turns(each)
Registered Member #55219
Joined: Tue Jun 09 2015, 11:21PM
Location:
Posts: 80
In fact you had a reply in that thread as well.. circuit works well :) As far as the circuit you showed, with the low voltages I would definitely add more turns on the primary. Start maybe with 7, test, remove one, test etc.. or start with more.
Also adjusting your topload can help.. I found Soda cans work well and have a fairly consistent value. Can even use a book and razor blade to cut them shorter / combine into one, razor goes into book to hold steady, twist can along tip of razor, scratching as you go.. almost like cutting copper pipe. (Youtube Alcohol Stove and look for DIY'ers for cutting technique)
Registered Member #2899
Joined: Wed Jun 02 2010, 06:31PM
Location: Deinze, Belgium
Posts: 255
jdub1581hv wrote ...
In fact you had a reply in that thread as well.. circuit works well :) As far as the circuit you showed, with the low voltages I would definitely add more turns on the primary. Start maybe with 7, test, remove one, test etc.. or start with more.
Also adjusting your topload can help.. I found Soda cans work well and have a fairly consistent value. Can even use a book and razor blade to cut them shorter / combine into one, razor goes into book to hold steady, twist can along tip of razor, scratching as you go.. almost like cutting copper pipe. (Youtube Alcohol Stove and look for DIY'ers for cutting technique)
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