Hartley oscillator
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The Hartley oscillator is an LC electronic oscillator that derives its feedback from a tapped coil in parallel with a capacitor (the tank circuit). A Hartley oscillator is therefore a type of inductively coupled variable frequency oscillator. It was invented by Ralph Hartley, who filed for a patent on June 1, 1915 and was awarded patent number 1,356,763 on October 26, 1920.
Hartley oscillators may be series or shunt fed.
Contents
Structure
- One tapped inductor (or a two-winding transformer)
- One tuning capacitor
Advantages
- Frequency varied using a variable capacitor
- Output amplitude remains constant over the frequency range
- Feedback ratio of tapped inductor remains constant
Disadvantages
- Harmonic-rich content
- Not suitable for a pure sine wave
See also
- Armstrong oscillator
- Colpitts oscillator
- Clapp oscillator
- Vačkář oscillator
External links, references, and resources
- Integrated Publishing's [Hartley oscillator]
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