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4hv.org :: Forums :: High Voltage
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Audio mod. flyback question.

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Tigeris
Sun Mar 22 2009, 04:20AM Print
Tigeris Registered Member #1656 Joined: Wed Aug 27 2008, 03:28PM
Location: Pittsburgh PA
Posts: 53
 		Hi all, i am working on an audio modulated flyback and had a couple questions. I'm still kinda new to the flyback transformer thing, but i have got one working. I used 2x 2N3055 transistors in parallel cause i kept blowing it out.

But my questions are,
1. What kind of caps should i use? like what voltages?
2. Instead of the IRFP250N, Could i use one of my 2N3055 transistors? ( if not i can always get one )

Here is the diagram i am working with.


1


Thanks for all the help in advance every one.
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Arcstarter
Sun Mar 22 2009, 04:41AM
Arcstarter Registered Member #1225 Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
 		The capacitors can be anything rated higher than the input voltage. I would definitely use a mosfet, less losses and faster. They wont die as fast as a 2n3055, and if made right they will never die. For that voltage input, almost any mosfet in a to-220 package or bigger could be used (other packages will work too, i am just stating that there are not many mosfets in to-220 or bigger that aren't rated for less that what you need)
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101111
Sun Mar 22 2009, 08:48PM
101111 Registered Member #575 Joined: Sun Mar 11 2007, 04:00AM
Location: Norway
Posts: 263
 		Can't say I agree with you on the "TO-220 thingy" Arcie.
I've seen several high voltage FET's in TO-220 packages that got a Rds on about a ohm voltage on 1200, max current on little less then one A.

Anyyway.. Tigeris use IRFP250, you'll get them cheap from ebay, but beware, they might be fake.
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Mads Barnkob
Sun Mar 22 2009, 09:35PM
Mads Barnkob Registered Member #1403 Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
 		The MOSFETs from Thaishopetc on ebay seems legit, Conner did some measurements on some samples I send him.

Also its those I used in the audio modulated flyback Tigeris showed schematics of and in the audio modulated sstc I am currently working on.
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aonomus
Sun Mar 22 2009, 10:45PM
aonomus Registered Member #1497 Joined: Thu May 22 2008, 05:24AM
Location: Toronto, Ontario, Canada
Posts: 801
 		Wasn't this the circuit that killed your iPod MadsKaizer?
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Tigeris
Sun Mar 22 2009, 10:54PM
Tigeris Registered Member #1656 Joined: Wed Aug 27 2008, 03:28PM
Location: Pittsburgh PA
Posts: 53
 		Thanks for the help guys :) I'm still working on it. But another question came up. The MOSFET i have has Base, Collector, and Emitter. But the diagram i am looking at has Drain, Gate, and Source. Could some one help me with that? i have no idea what is what.
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101111
Sun Mar 22 2009, 11:26PM
101111 Registered Member #575 Joined: Sun Mar 11 2007, 04:00AM
Location: Norway
Posts: 263
 		If it got B-C-E, it is not a FET it is a BJT.
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Mads Barnkob
Mon Mar 23 2009, 07:59PM
Mads Barnkob Registered Member #1403 Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
aonomus wrote ...

Wasn't this the circuit that killed your iPod MadsKaizer?

Hehe yeah :D

But it has more to do with the ipod shuffle using the headphone plug for both earplugs, rechargeging and datatransfer, so the tiny IC that controlled when it did what did not like the transients :) (*cough* weak piece of crap design *cough*)

Never had problems with the CD player I also used with this circuit.
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101111
Mon Mar 23 2009, 08:11PM
101111 Registered Member #575 Joined: Sun Mar 11 2007, 04:00AM
Location: Norway
Posts: 263
 		An idea is to tie two fast diodes antiparallel to ground this will make the voltage never increase 1.2Vpp and might save your player..
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big5824
Mon Mar 23 2009, 09:29PM
big5824 Registered Member #1687 Joined: Tue Sept 09 2008, 08:47PM
Location: UK, Darlington
Posts: 240
 		what about using an optocoupler to protect the player?
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