The Colpitts oscillator is applicable to many applications. In the end steady, smothered oscillations are obtained.Ĭolpitts oscillator circuit formula: Where L is the inductance of L1 and C is the total capacitance of C1 and C2 in series. The total phase shift of 360º is obtained, the transistor provides a 180º phase shift while the capacitor feedback provides another 180º phase shift, and hence total 360º phase shift is obtained which provides a positive feedback value. The values of two capacitors C1 and C2 decide the feedback amount. The amplified signal is supplied to the tank circuit to meet out losses during the conversion of energy between the two capacitors and inductors. These oscillations at C2 are applied to the transistor base-emitter terminal which amplifies it and is obtained at the collector terminal. When the power supply is provided to the circuit, both the capacitors C1 and C2 get charged and then discharge through the inductor which initially produces oscillations. The transistor BC547 works as an emitter follower where R1 and R2 resistors bias the CB (collector-base) terminals and BE (base-emitter) terminals while the collector and base terminals have a tank circuit in their feedback path. The inductor is connected in parallel to the series capacitors C1 and C2 (tapped capacitors). The Colpitts oscillator circuit contains only a few components arranged in the following order.
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