Frequency of oscillation of Colpitt’s oscillator is
1
\(f = \frac{1}{{2\pi \sqrt {L(\frac{{{C_1}{C_2}}}{{{C_1} + {C_2}}})} }}\)
2
\(f = \frac{1}{{2\pi \sqrt {L(C_1+C_2)} }}\)
3
\(f = \frac{1}{{2\pi \sqrt {(L_1+L_2)C} }}\)
4
\(f = \frac{1}{{2\pi \sqrt {(L_1+L_2+2M)C} }}\)