Is there a way to make an LC oscillator that works in most circumstances? Which is able to start up an keeps oscillating for a wide range of inductors?
I'm asking this because I made a LC oscillator which can switch between several capacitor values (with analog switches) for operation in different frequency ranges.
In the simulation (falstad) is working for every possible capacitor combination. But in reality it is only working when both capacitors are enabled.
I don't need a perfect sine wave, but I do need a frequency dependent on the external inductor and adjustable in frequency range.
So I'm looking for an oscillator that starts in most conditions and is able to keep its oscillation going. Might this be possible by over-sizing the amplifier gain or using other components like opamp's. The frequency will be used to measure the inductance of the external inductor. Or any tips on how to dimension all the parts to make it more stable?
- The transformer is used to provide galvanic isolation from the external inductor which will be placed in the pavement as a vehicle detector