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The Best Electronics Tutorial for Colpitts Oscillator | Easybom Colpitts oscillator, also known as a capacitive three-point oscillator, capacitive feedback oscillator, is an LC oscillator invented by American electrical engineer Edwin Colpitts in 1918 (electronic oscillator that uses a combination of capacitors and inductors to determine the oscillation frequency) design. The Colpitts oscillator features an active device with feedback from a voltage divider consisting of two capacitors in series with an inductor. Like other LC oscillators, the Colpitts circuit consists of a gain device (such as a bipolar junction transistor, FET, op-amp, or vacuum tube), and the feedback loop consists of an LC parallel circuit (tuning circuit) as a bandpass filter to fix the oscillation frequency. The Colpitts oscillator can be seen as the dual of the Hartley oscillator, in which the feedback signal comes from an "inductive" voltage divider consisting of two coils in series (or a tapped coil).