Quote:
Originally Posted by liudengyuand
At least you need to know the inductance value of L1 to roughly determine the resonance frequency with c10. This requires a high-precision inductance meter.
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There is a simpler system, just build the two coils, oscillator and sensor stage, the same and check the output of the sensor stage (DC voltage). When the maximum value is obtained, it means that L1 / C10 is in resonance with the oscillator.