modified 11 years ago

Sine Oscillator

00:47:35

I wonder is it a perfect sine? 

published 11 years ago

hurz

11 years ago

Yes and No, it is for a little while but its unstable and dies. Because there is a pico gain missing to keep it oscillating foever. And if you increase the gain a little it will overtune and do clipping what is also not nice for a perfect sin. So the trick is to regulate the gain somehow (diodes, bulb, mosfet, ...). But this regulation will cause some little distortion :-( Hope this helps a little

Leo3065

11 years ago

Thanks, so how hard to get a almost perfect sine wave?

hurz

11 years ago

It depens on what you see as perfect and how you measure it. One way is define a THD in percent. 5% is easy below 1% it starts getting interessting.

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