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How to fix frequency

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jake14

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i was using a transformer with midpoint each primary have 120uH to get Mhz of frequency
i use 14nF but the output frequency is about 52khz what should i do to get MHz frequencies
25105730_10208300047618714_1110740664_n.png
 

Do you know the formula for an LC resonant circuit?

Google it and calculate using your circuit values.
 

There are more capacitances in parallel to the output transformer, C2 - C5 and transistor capacitances form the effective capacitance. You hardly reach MHz with the present dimensioning. Also consider that the total transformer inductance is 480 µH.
 

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