Hartley_oscillator Hartley_oscillator

Hartley oscillator - Definition and Overview
Image:Hartley_osc.jpg
Schematic Diagram

The Hartley oscillator is an LC electronic oscillator that derives its feedback from a tapped coil and is varied in frequency by a variable capacitor. A Hartley oscillator is therefore a type of inductively coupled variable frequency oscillator.

Hartley oscillators may be series or shunt fed.

Structure:

One centre tapped inductor.
One tuning capacitor.

Advantages:

Frequency simply varied by capacity net value in the tank circuit.
Output amplitude remains constant (over the frequency range).
Feedback ratio of inductor 1 to inductor 2 remains constant.

Disadvantages:

Harmonic content rich.
Not suitable for a pure sine wave.

See also: Colpitts oscillator | Clapp oscillator | Vackar oscillator | Armstrong oscillator

External links, references, resources

  • Integrated Publishing's Hartley oscillator (http://www.tpub.com/content/neets/14181/css/14181_81.htm)

Example Usage of oscillator
bongdibongdatso: ratzu Measuring the LO Frequency - Eddystone 940: 3D King has added a photo to the pool: Tapped into the local oscillator to measu..
dreich: @sandyblair The oscillator at the start and the whooshy synth noises are surprisingly in the spirit of space rock! Respect to James Last!
addie_zao5g6: Using a carbon nanotube, Cornell researchers make an oscillator so... http://tinyurl.com/yaz5vrx
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