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My 4Mhz amplitude modulated audio sstc

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Experimentonomen
Fri Dec 25 2009, 12:55PM
Experimentonomen Registered Member #941 Joined: Sun Aug 05 2007, 10:09AM
Location: in a swedish junk pile
Posts: 497
I´d say yes.
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eniyuki
Fri Jan 22 2010, 06:06PM
eniyuki Registered Member #2148 Joined: Tue Jun 02 2009, 02:22AM
Location:
Posts: 62
can i use 2 irfp250 or 450 instead of irf630? dont have 630 here locally
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eniyuki
Wed Jan 27 2010, 09:26AM
eniyuki Registered Member #2148 Joined: Tue Jun 02 2009, 02:22AM
Location:
Posts: 62
any one? Can i use irfp450?
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mb
Wed Jan 27 2010, 12:32PM
mb Registered Member #2485 Joined: Fri Nov 27 2009, 02:31PM
Location: Germany
Posts: 11
For Q5 you can use a IRFP450.

For Q6 i wouldn't use a IRFP450
because Ciss is four times higher as Ciss from the IRF630
this means you need more power to drive the mosfet.

look at this guy ,he build a 4Mhz class e sstc with a IRFP460
Link2
(look under sstc 4)
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eniyuki
Wed Jan 27 2010, 07:18PM
eniyuki Registered Member #2148 Joined: Tue Jun 02 2009, 02:22AM
Location:
Posts: 62
mb wrote ...

For Q5 you can use a IRFP450.

For Q6 i wouldn't use a IRFP450
because Ciss is four times higher as Ciss from the IRF630
this means you need more power to drive the mosfet.

look at this guy ,he build a 4Mhz class e sstc with a IRFP460
Link2
(look under sstc 4)
thanks for the link! Can I add audio modulation to sstc4? in the above link?
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eniyuki
Wed Feb 03 2010, 07:36AM
eniyuki Registered Member #2148 Joined: Tue Jun 02 2009, 02:22AM
Location:
Posts: 62
sorry for double post, but can i add audio modulation to sstc4 (link above)? if so, what pin should i use?
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eniyuki
Thu Feb 04 2010, 05:42PM
eniyuki Registered Member #2148 Joined: Tue Jun 02 2009, 02:22AM
Location:
Posts: 62
mb wrote ...

For Q5 you can use a IRFP450.

For Q6 i wouldn't use a IRFP450
because Ciss is four times higher as Ciss from the IRF630
this means you need more power to drive the mosfet.

look at this guy ,he build a 4Mhz class e sstc with a IRFP460
Link2
(look under sstc 4)
sorry for bumps. anyone can answer my question?
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Arcstarter
Thu Feb 04 2010, 09:03PM
Arcstarter Registered Member #1225 Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
Apologizing does not excuse acting against the rules, and doing it twice certainly does not help...

No, with that circuit there is not a way to audio modulate it... If you checked the data sheets for each part and took some time to understand it (instead of building something you do not understand) then you could answer it yourself. This forum is mostly for help with something that has not been fully documented, or you cannot find an easy answer, or a dilemma between two different possibilities.
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teslaozone
Fri Aug 05 2011, 07:15PM
teslaozone Registered Member #4047 Joined: Fri Aug 05 2011, 06:39PM
Location:
Posts: 6
Hello, Im planning on building this for my highschool science fair. Does anyone know if there is an english schematic? I do have experience building tesla coils, but i have never built something off a schematic before, and it doesnt help that it its a different language. Thanks
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SKA
Mon Aug 08 2011, 12:15PM
SKA Registered Member #3636 Joined: Fri Jan 21 2011, 04:07PM
Location: Isny
Posts: 2
Hi teslazone

I'll try to translate the schematic for you:

The Notes on the right side of the shematic:
-C6 and C8 are high-pass capacitors. If you want to hear the higher frequencies of the audio-input you should choose 100nF types
-R5, R7, R8 and R13 are high precision trimmer-resistors
-Q5 and Q6 should be mounted on a heatsink with a thermal conductivity of maximal 3,2K/W
-The 50V Power supply should have a minimum of ripple voltage. Use a capacitor with at least 10000µF. The current is about 1,8 to 2,3 Amps
The current of the 12V Power supply is about 0,3 Amps

R13 regulates the bias voltage for the Mosfet (Q5). Set this voltage to about 30 to 35 V
L1 is a 570µH Inductor, wounded on a 26mm toroidal ferrit core (17 windings of 0,8mm Wire)
C11 should be a high peak current type like a FKP1. (we often use these capacitors in germany)
T1/GDT is also wound on a 26mm toroidal ferrite core

I hope, you understood everything, because my english is not quite good cry


Stefan


p.s. @ reaching: warum nennst du dich hier nicht auch CTC, so wie in den deutschen Foren?
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