Very high frequency (>>1MHz) PWM

[Speakerguy]

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!

 

[k7elp60]

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

 

[Mikebits]

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

 

[Speakerguy]

Youtube has several videos that are very cool.

 

[audioguru]

Youtube has several videos that are very cool.

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

 

[Speakerguy]

Sounds like a standard YouTube video

 

[Torben]

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

 

[Speakerguy]

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?