Hartley Oscillator:

Operation:

$R_1,R_2$ and $R_C→$ Resistances for biasing of transistors.

$C_{c1}$ and $C_{c2}→$ Coupling capacitors $C_C→$ bypasses $R_e$. The feedback circuit is formed by components $L_1,L_2$ and $L_s$

The amp is $C_e$ configuration, Hence it provides 180 degree phase shift between its i/p / o/p . The feedback circuit …