Analysis of Junction Transistor Audio Oscillator Circuits

Transistor oscillators, including Colpitts and Hartley types, have been analyzed using the low-frequency equivalent circuit for the transistor. Conditions for sustained oscillations and expressions for the frequency of oscillation and for the stability of this frequency with variation in transistor parameters have been derived for these circuits. In addition, reactance-stabilization conditions have been determined following the method which Llewellyn has applied to vacuum-tube oscillators.