An Example of Hartley Oscillator using OpAmp, You just need to flick the switch, initially switch is closed so that capacitor can be charged with 10V supply, when you flick the switch capacitor disconnects from 10V supply and starts giving it's own energy in circuit. Initially frequency is around 250Hz, to change that, change value of C, L1, L2. Total impedance is L = L1 + L2
