[SOLVED] Crystal Oscillator problem

[FvM]

I thought the 10 uF was to block DC, does it have any other applications also ?

Some crystal oscillator circuits are using a series capacitor to adjust the crystal load capacitance to an intended value. As far as I see, this is only useful for oscillators with a non-inverting gain block, it won't help in the present circuit.

The reason why your original circuit doesn't work has already been exhaustively analyzed. It hasn't to do with the series capacitor value. 10 µF is however unreasonably large, the value can be reduced.

 

[chuckey]

A 10 MF capacitor is likely to be lossy at 1 MHZ due to its internal inductance.
Frank

 

[DasPreetam]

Okay so how to calculate the optimum value ?

 

[chuckey]

You need a capacitor whose reactance is much lower then the input resistance of the transistor, say Xc = 100 ohms (or lower).

 

[kripacharya]

There are thousands of tried and tested oscillator circuits based on crystals, and the theory which goes into their design, stability, phase noise, pull-factors etc etc.

Hasn't this thread's discussion about a non-standard novel topology reached it's natural death now ?

Can the OP please read all the inputs and comments, USE them for whatever end you want to achieve, and close this useless thread now please ?

 

[DasPreetam]

That is a rude reply, I must say. Anyway I'm closing this topic not because it cleared my doubt, but because this discussion is going nowhere

 

[FvM]

I think kripacharya referred to the point that you didn't take up the suggestions how to make the oscillator work. I'll close the thread because the original problem has been solved. If any of the contributors feels a need to reopen it, pleasse contact me.