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Forums
4hv.org :: Forums :: High Voltage
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Flyback and single transistor driver

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lpfthings
Sun Jul 12 2009, 03:22AM
lpfthings Registered Member #1361 Joined: Thu Feb 28 2008, 10:57AM
Location: Cairns, Australia
Posts: 305
 		OK, I bought one of these: Link2

And also a MJ10012 just incase I decide to try the single transistor driver again, but for now I'll try the 555 driver. Harry, PM on the way :)
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lpfthings
Sun Jul 12 2009, 04:55AM
lpfthings Registered Member #1361 Joined: Thu Feb 28 2008, 10:57AM
Location: Cairns, Australia
Posts: 305
 		hmm OK, so the circuit works, and I can hear audio, but once again I only get <1cm arcs, the MOSFET gets hot very quickly despite the huge heatsink. I have 5 turns on the primary, and it draws about 4A @ 15V.

Any idea's?
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Dr. Dark Current
Sun Jul 12 2009, 07:18AM
Dr. Dark Current Registered Member #152 Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
 		Well, that's a weak MOSFET and from what I can see from the datasheet, it's intended for a power amplifier. They don't say the ON resistance but I think it's gonna be huge.

You should get an IRF540 or IRF640 with respective voltage ratings 100V and 200V which are $1 MOSFETs for switching applications.
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lpfthings
Sun Jul 12 2009, 07:32AM
lpfthings Registered Member #1361 Joined: Thu Feb 28 2008, 10:57AM
Location: Cairns, Australia
Posts: 305
 		Wel ive managed to get a much larger arc and the MOSFET doesnt get as hot by adding more turns to the primary. So now I can get about 2cm before the arc breaks up, although it only draws like 2A from my PSU.

Audio modulation works :D Although a bit quiet ...
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Proud Mary
Sun Jul 12 2009, 08:24AM
Proud Mary Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Dr. Kilovolt wrote ...

Well, that's a weak MOSFET and from what I can see from the datasheet, it's intended for a power amplifier. They don't say the ON resistance but I think it's gonna be huge.

You should get an IRF540 or IRF640 with respective voltage ratings 100V and 200V which are $1 MOSFETs for switching applications.



Rds(on) is 0R18
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lpfthings
Sun Jul 12 2009, 08:35AM
lpfthings Registered Member #1361 Joined: Thu Feb 28 2008, 10:57AM
Location: Cairns, Australia
Posts: 305
 		Would amplifying the audio input help at all? I do get audio but it's fairly quiet?

EDIT: This thing is only drawing like 2A @ 16V, why wouldn't it be hogging all the current it can get from my PSU when the primary is pretty much a dead short?!?!

Cheers,
Dan
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Antonio
Sun Jul 12 2009, 02:01PM
Antonio Registered Member #834 Joined: Tue Jun 12 2007, 10:57PM
Location: Brazil
Posts: 644
lpfthings wrote ...

Would amplifying the audio input help at all? I do get audio but it's fairly quiet?

EDIT: This thing is only drawing like 2A @ 16V, why wouldn't it be hogging all the current it can get from my PSU when the primary is pretty much a dead short?!?!

Cheers,
Dan

The audio input ahall have a few volts of amplitude. At the frequency where the driver oscillates, the primary is not a short circuit. Probably has an inductance of several tens or hundreds of uH.
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lpfthings
Mon Jul 13 2009, 06:45AM
lpfthings Registered Member #1361 Joined: Thu Feb 28 2008, 10:57AM
Location: Cairns, Australia
Posts: 305
 		I made a video of it here: Link2

I see "Madkaizer" has also used this drive and he gets a fairly hot output. I guess I will try the IRL640 that Harry is sending (Thanks man) and see if I can get some more power into it smile
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Proud Mary
Tue Jul 14 2009, 02:33AM
Proud Mary Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
 		In the post! smile Together with a few other power types that you can try, lad.

Don't worry about money. Next time you see a war refugee or a boat person, put a couple of dollars in their hand, and I shall be repaid.

Don't know how long a letter takes to get Down Under,

Best Wishes,

Harry.
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