LC oscillator component values

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froten

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hello all,

when designing LC oscillators, is there a rule of thump on how to select the L & C values? How I can select these values for a specific frquency?

any help is very appreciated
 
Just use the standard formula for LC resonance - or one of the many on-line calculators.

This is the top answer on google.
 
Thanks for the replay.

My quesion is on selecting the values, for example:

440pF & 0.5UH will reasonate at 10.7MHz
220pF & 1UH will reasonate at 10.7MHz
110pF & 2UH will reasonate at 10.7MHz
55pF & 4UH will reasonate at 10.7MHz

so which values are the best?
 

A reference I have indicates that the reactance of the coil in a Colpitts oscillator should be around 140 ohms, so for 10.7Mhz, this calculates out as a 2uH coil.

JimB
 
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