The Colpitis sinusoidal oscillator provides stable output amplitude and frequency from 0Â°F to +150Â°F. In addition, output amplitude is large and harmonic distortion is low. Oscillation is sustained by feedback from the collector tank circuit to the emitter. The oscillator's frequency is determined by: Potentiometer R3 is an output level control. Control Rl may be used to adjust base bias for maximum-amplitude output.
The circuit was operated at 50 kHz with LI = lOmH, Cl = 3500 pF, and C2 = 1500 pF.