Very high frequency (>>1MHz) PWM

Hey guys,

I'm trying to make a plasma tweeter. I'm going to try a very standard solid state tesla coil as a starting point with the primary powered by a very high frequency PWM signal to modulate the arc amplitude. From what others have said, it takes 5MHz on up to get decent sound quality out of it.

Where do I start looking for a good way to make an RF square wave signal >5MHz modulated by an audio signal (20KHz)? I mean, I've done low frequency triangle wave and comparator systems before, but I'm really not sure how to handle things at this high frequency. Thanks!

There are a number of 74HC series of IC's that will do the job.

I have never heard of this thing before, sounds quite cool. Check out this link.
**broken link removed**

Youtube has several videos that are very cool.

speakerguy79 said:

Youtube has several videos that are very cool.

Click to expand...

The sound in most of the videos is very distorted and full of snaps, crackles and other noises.

Sounds like a standard YouTube video

Yeah, I'd think most people who build these aren't looking for the ultimate in high fidelity. Can't beat the cool factor, though.


Torben

QUESTION: Can a Tesla coil be driven by a fixed frequency or do I need some kind of feedback to make sure I am driving it at resonance under changing conditions?