Just to share an idea about using square waves to achieve the mini resonance if the main resonance is difficult to achieve :

the full document is here :
the full document is here :
Code:
http://go.owu.edu/~rakaye/PHYS275/Diode%20and%20Resonant%20Circuits.ppt

the circuit i built is variable frequency/duty , the capacitor used to set the frequency is 10nf , so i think the chip is very old.
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