A popular transmitter back in the day was based on the Hartley oscillator (PDF link). Using only a single triode tube and a tuned circuit with coils wound from 1/4″ copper tubing, Hartley ...

Let us apply our knowledge of oscillator fundamentals to some commonly used oscillator circuits. Figure 2-2( a) shows a popular circuit known as a Hartley oscillator. Its identifiable feature is the ...

The relationship between positive feedback and oscillation is explained. Two different categories of oscillator circuits are elucidated, namely the oscillators based on positive feedback and resonant ...