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Registered Member #941
Joined: Sun Aug 05 2007, 10:09AM
Location: in a swedish junk pile
Posts: 497
why complicate things with a sawtooth generator, a comparator and the drive circuitry for the pwm bit when its much simpler to just amplitude modulate the power supply with a transformer and a regular audio amplifier ?
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
Experimentonomen wrote ...
why complicate things with a sawtooth generator, a comparator and the drive circuitry for the pwm bit when its much simpler to just amplitude modulate the power supply with a transformer and a regular audio amplifier ?
correct me if im wrong, but isnt a linear power supply and audio amplifier a 50% efficiency at most, while at near or approaching 100% output power?
doesnt that mean big losses for relativly low sound? and is this the diffeerence between the more complicated systems others advocate for?
Registered Member #941
Joined: Sun Aug 05 2007, 10:09AM
Location: in a swedish junk pile
Posts: 497
who cares ? plasma tweeters arent of any practical use anyways. there were a few brands that tried, liked magnat, ionophone and hill plasmatronic or whatever the name was, they all flopped.
Registered Member #607
Joined: Tue Mar 27 2007, 10:39AM
Location:
Posts: 64
A few years back, I posted my ZVS with the power supply modulated via a 1W amp. The sound was not too bad in volume or clarity. Just look for Singing musical arc / plasma flyback by VidorWolf on Youtube. There are two videos. Cheers.
Registered Member #941
Joined: Sun Aug 05 2007, 10:09AM
Location: in a swedish junk pile
Posts: 497
I tried using a series pass transistor set to pass half the supply voltage but found that replacing it with a transformer and using a regular speaker poweramp sounded much better and louder.
Registered Member #3429
Joined: Sun Nov 21 2010, 02:04AM
Location: Minnesota, USA
Posts: 288
Experimentonomen wrote ...
I tried using a series pass transistor set to pass half the supply voltage but found that replacing it with a transformer and using a regular speaker poweramp sounded much better and louder.
Experimentonomen -- Take a look at my plasma speaker project:
It uses a pass transistor in the DC power supply section as the modulator. I found that by being able to adjust the bias on the base of the transistor, it allows the transistor to operate in it's linear portion of its amplification curve. With sufficient audio drive, I can acheive 100% modulation, and the sound is not only LOUD, but is reasonably clear and distortion free. Of course, as with all plasma speakers and tweeters, it suffers response on the low end of the audio spectrum. I plan on experimenting with a different mechanical design for the arc assembly which should improve the low end response. I'll publish my new design if/when I make a significant improvement.
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Singing ZVS driver
