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So, am currently building a SSTC(solid state tesla coil), and i am trying to get the coil to pulse at a high frequency.
I found this pwm module that pulses at a high frequency (Power Pulse Modulator - PWM-OCXi v2.1), but i have a lot of simple high voltage pwm modules laying around, and i was wonderig:
If i run them in series, can i obtain a higher frequency?
What i mean, is that, if i pwm the power supply to the next pwm module, wil i obtain a higher frequency?
Thanks for eny help 
Thanks the reply John 
I investigated if it was posible to change a pwm module to give me a higher frequency, and i stumbled upon a solution that i will use.
If i switch the capacitor on a 555 pwm module, i supposedly change the frequency. So,i think that will be the solution i will use.
Magnus
I know 
The reason i am trying to run it at a high frequency is becouse of noise!
right now, the coil makes a lot of noise when shoting sparks, and if puls it to a higher frequency it might make less noise
Btw hers the schematics am using:
http://rpsx.eu/upload/cZbf3yvw.jpg
Magnus
just based on the circuit you provided, you are already well above audio range (350KHz) for the oscillator so there is no point in increasing the frequency
you may have an issue with breakdown in your coil or the sparks themselvs are what is making the noise and thats part of the way it works when sparking and ionizing the air, it creats compression waves or something like that.
feed an audio signal into the oscillator at the right point and you could get it to play music at the spark 
maybe!
anyway as said, I dont think changing the frequency of the 555 is going to help
