Originally posted by John.K1
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Hi John,
yes i can change the frequency but the range of frequency is relatively low, for example changing the discharge capacitor in NE555 module to 500 pf the frequency go to 50KHZ i can vary this frequency to 20KHZ even though my system resonate at 26 KHZ but in high voltage the system start responding below 20 KHZ !!! i don't know why this happen ??

Just some advice 

and increase more and more while the capacitive side is resting
and taking more power !!!
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