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Registered Member #1956
Joined: Wed Feb 04 2009, 01:22PM
Location: Jersey City
Posts: 172
News from the Lab!
I spent 3h on the lab today trying to get the snubber working (the design that Richie proposed). First of all I choosed a fixed frequency to work: 95 kHz Then I start with a 0,01 uF 400 V cap and adjusted the dead time to get the right gate waveform (or tried to). If the cap value was not good I changed for a larger one..
My best shot was a 220 nF cap, that gave me the following waveform:
After a few minutes running the FET was cold. The arc holds steady with a higher distance between electrodes. The power comsumption was the same as before. The only concern was the cap heating too much, but nothing exploded =)
Then I discovered a HUGE problem: when I tried to get some music of it I discovered that the sound was weak and distorced.
Is that snubber a good design to Audio Modulated plasma speaker? Is that waveform good enought? I think I can make it better but before killing more caps, did anyone tried that snubber with audio before? Without audio the results are good!
My second try was Dr. Kilovolt design. But I have no idea how to make a 1 uH air core coil. =P Can someone help me with a short description of how to make one?
Registered Member #1643
Joined: Mon Aug 18 2008, 06:10PM
Location:
Posts: 1039
I'm not sure what snubber design you used...I just remember when I ran my snubber backwards, I had thicker arcs. The right way was thin and long. But when I had it backwards, The music was very loud due to the thicker arcs. A bit too loud for me personally, However, I'm sure yours sounds better. I had a 555 with audio on pin 5, it sounded like grate quality but I'm sure a real audio amp would be better
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Another plasma speaker [edit: photo]
