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LC Oscillator Suggestion

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jonnybgood

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I will be designing an LC meter which will measure the frequency and will work out the value of an inductor by the difference in frequency. I will be adding (changing) the value of inductance and therefore the resonant frequency of the LC oscillator. What LC oscillator do you suggest ( something with a significant range) and maybe direct me to some schematics with component values.

thanks

Brandon
 

you can grab some ideas here :
**broken link removed**
and grab some ideas also on the rest of the web site !
regards,
 
To simulate an oscillator in Proteus, I recall adding ic=0 as a label.. does anybody know exactly where it should be put? This has to do with the natural generation of thermal nois which starts the oscillations.

thanks
 

This has to do with the natural generation of thermal noise which starts the oscillations.
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Something like this. More exactly, the simulation circuit runs at risk to never start oscillation, because thermal noise isn't simulated and the initial solution achieves a perfect steady state. Real oscillators are rather started by switch-on transients than noise, but noise would be sufficient for the more theoretical case, that the circuit is initially in an exact steady state.

Placing a none steady-state initial condition for e.g. a node voltage generates an initial transient sufficient to start oscillations. Skipping the initial solution in transient analysis is an even more simple method. It's provided by all standard SPICE simulators.
 
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