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Registered Member #3637
Joined: Fri Jan 21 2011, 11:07PM
Location: Buffalo, NY
Posts: 1068
I recently made a ZVS driver, as you may or may not be aware of. I also lost a PSU recently, and have no way to power anything I build. I took two transformers I had lying around, and hooked them up in parallel feeding to a rectifier I had made. I then hooked up that output to my zvs driver, and the voltage sagged alot, but I noticed something interesting; There was 60 hz hum in the arc when i drew it.
So then this got me thinking, and wondering, would it be possible to introduce some other more ...wanted noises, like music, into the incoming voltage feeding the ZVS? Grenadier has a plasma speaker circuit, and I'm wondering if that could be used to drive a normal ferrite core transformer, and then feed that into the ZVS. Any suggestions?
Registered Member #3637
Joined: Fri Jan 21 2011, 11:07PM
Location: Buffalo, NY
Posts: 1068
Hm. could you use a Ferrite Core small isolation transformer, hook up the primary or secondary or whatever to an audio player, then take the output of that and put into the positive voltage coming into the ZVS? It would prevent the 60 hz hum from hurting the audio player.
Registered Member #2887
Joined: Sat May 29 2010, 11:10PM
Location: Panama City, Panama
Posts: 107
The 60 hz humm comes from the lack of sufficient filtering capacitors. Altough connecting an amplifier as a supply to a ZVS "could" theorically work, the amplifier would have to have a terribly high output for any reasonable arc lenght. A much better way to do this would be (in my opinion) pulling the gates of both mosfets down to turn iit off, and leave them floating (NOT PULL UP) to create an On state. This way, you could achieve simple polifonic tones through square waves, or even more elaborate sounds with some pulse width frequency. This would work similar to a class D amplifier, the carrier being the normal ZVS frequency, while the sound pulling the gates of the transistor down as needed.
Don't take my word as final, and research a bit more.
Registered Member #2887
Joined: Sat May 29 2010, 11:10PM
Location: Panama City, Panama
Posts: 107
Oh, I see. Seems like an alternative way of doing it, altough still dunno how to remove the 60hz noise with that technique. Adding caps would elimintae the humm, but it would also eliminate you desired noise (AKA music) maybe a passive filter blocking 60hz in the positive supply would remove the humm, while still allowing your "noise" pass through. Im still not sure if it would work, so wait for more experienced people to hop in the thread.
Registered Member #1408
Joined: Fri Mar 21 2008, 03:49PM
Location: Oracle, AZ
Posts: 679
The cleanest example I have seen of this was via Dr. Spark's (& others) use of fiber optic lines. - All depends on what you are willing to spend in your design; both in therms of design & money....
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ZVS, and in line noise...
