Figure 6a and Figure 6b shows a Hartley Oscillator block diagram and Hartley RF oscillator circuit with emitter follower respectively. The tuned circuit is the component LC where L is an auto-transformer with turn ratio of n1 and n2. C2 is a DC blocking capacitor. VEB is the input and VCB is the output. The oscillation signal is coupled via the transformer with a turn ratio of T1 and T2. The output of the oscillator is at emitter follower, Vo