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Registered Member #3795
Joined: Mon Mar 28 2011, 09:09PM
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Posts: 4
So im currently working on a plasma speaker as a spring break boredom thing. Since spring break is only a week i wanted to build the speaker using parts i wont have to order online, thus im stuck with irf510 mosfets and 555 timers from radioshack. I found a flyback from a tv and should be good in that sense. Im just not sure how to wire the flyback for audio modulation and do it without blowing up the mosfets. I've been looking around and this was the only thing i could find close to my restrictions: the only thing is that it isnt wired for audio modulation. Can someone help me regarding the wiring for a circuit that can handle the 510 mosfets?
Registered Member #2893
Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242
I really don't think the IRF510 is suitable for the task, especially if you got it at the crapshack (they stock low quality components).
The 555 plasma speaker is an inherently poor design because with one mosfet the load is never "taken off" the fet. Using 2 fets in a half bridge dramatically cuts down on heat, and it sounds better than with just one.
Registered Member #3795
Joined: Mon Mar 28 2011, 09:09PM
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ok, that makes so much more sense now, bookmarked the page for future reference. So it looks as if something like a 9 volt might work, it will just be awfully crappy correct?
Registered Member #3766
Joined: Sun Mar 20 2011, 05:39AM
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Posts: 624
Since you're doing it out of "spring break boredom", you may be able to make it work, but you're going to need to have your FET on ice, and make sure that its well protected from any voltage spikes. and I doubt you'll be able to run it for more than a minuet or so, but plasma speakers aren't really practical in any sense anyway. Try putting a 10nF cap across the source and drain and possible a high value electrolytic across the source and the high side of the primary (assuming FET is on the low side). If you have the ability, get some IRFS654 FETs, they're cheap and they'll work much better.
Registered Member #3766
Joined: Sun Mar 20 2011, 05:39AM
Location:
Posts: 624
pauldemonkey wrote ...
ok, that makes so much more sense now, bookmarked the page for future reference. So it looks as if something like a 9 volt might work, it will just be awfully crappy correct?
If you want to drive it at a really low voltage, use a large gauge wire for the primary with 4ish turns. Also, the large value caps I mentioned earlier might help.
Registered Member #2893
Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
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Just so you know, you can get free samples from fairchild delivered second day air. That should be fast enough that you may get all the parts before spring break ends...
Registered Member #3766
Joined: Sun Mar 20 2011, 05:39AM
Location:
Posts: 624
20ga might work, but it might not deliver enough energy, resulting in poor sound quality. I found a noticeable difference between 20ga and 18ga. If it's all you've got, give it a shot. you might be able to compensate with less windings
As for the MOSFET, it's better than the one you've got. You might want to look into wiring multiple in parallel.
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plasma speaker help
