sstc changing frequency issue

[Jeg]

Hey guys
I need your opinion for analyzing more this Armstrong - mosfet oscillator. More specifically, i'd like to know about this pi filter consisting of 0.01uF, 100uH, and 0.68uF. Is there any way from this to find out the cut off freq. that Radu used? What is the effect of this filter on the overall efficiency of the oscillator? Is 0.68uF cap affecting the osc. freq of the drain coil? What if i discard both capacitors and keep only the chock as in mazzilli driver?
The same questions applies on the use of the 0.22uF Cap. Whats its use there?

What i don't like on this oscillator is its instability, and the same time its capability for exploding mosfets without efforts Is it possible without many modifications to use an IGBT instead of the mosfet?

I could ask this questions on a general purpose electronic forum, but inside this forum there are members with so much knowledge that is very rare to find them somewhere else.


Tnks
Jeg

[Groundloop]

Hey guys
I need your opinion for analyzing more this Armstrong - mosfet oscillator. More specifically, i'd like to know about this pi filter consisting of 0.01uF, 100uH, and 0.68uF. Is there any way from this to find out the cut off freq. that Radu used? What is the effect of this filter on the overall efficiency of the oscillator? Is 0.68uF cap affecting the osc. freq of the drain coil? What if i discard both capacitors and keep only the chock as in mazzilli driver?
The same questions applies on the use of the 0.22uF Cap. Whats its use there?

What i don't like on this oscillator is its instability, and the same time its capability for exploding mosfets without efforts Is it possible without many modifications to use an IGBT instead of the mosfet?

I could ask this questions on a general purpose electronic forum, but inside this forum there are members with so much knowledge that is very rare to find them somewhere else.


Tnks
Jeg

http://www.electroschematics.com/835/rfsim99-download/

GL.

[Jeg]

http://www.electroschematics.com/835/rfsim99-download/

GL.

Cool soft GL! Already downloaded and installed! This self oscillator was very educative to me as I learned how a constructive resonance build up can happen. It is just time for improvements on this, as its instability already cost me more than 60euros in mosfets!!!