Oscillator and mark/space ratio

[shoivn]

Oscillator

Hi all!
I have some questions about Oscillator.Please help me!

***Wien
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1/What determines amplitude of the output when the gain is greater than the value needed to oscillate?
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2/The value of (R4+R5) can just be varied in some limit.What causes this?What will happen if this value is out of limit?

***LC Oscillator
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What is the most important component which determines the frequency of this LC oscillator?

***Multivibrator
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1/what is mark/space ratio?What will happen when we change this ratio(does the frequency change?...)
2/If C1 and C2 are different,does the frequency change with mark/space ratio?
3/When mark/space ratio is 1:1,how is the signal's spectrum?

 

[Miguel Gaspar]

Oscillator

The first one R3 and R4 sets the gain.

The second one R3 and R4 sets the gain, but R5 and the two diodes are for avoid saturation. When the amplitud increases (positively or negatively) one diode activates and put R5 in parallel with R3 that makes resistence reduces.

 

[IanP]

Re: Oscillator

In LC generators frequency depends on both: L and C ..

Mark-Space ratio is explained on the attached pictures ..

Regards,
IanP