2-component Hartley Oscillator

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< Radio Frequency Electronic ~ 2-component Hartley Oscillator

eric

Posted: Sun Aug 27, 2006 6:29 am Post subject: 2-component Hartley Oscillator

Site Admin Joined: 01 Jan 1970 Posts: 311

G. Baars
Although Elektor never actually launched a design contest
under the name “low component-count oscillators” the author
was challenged by ‘Three Component Oscillator’ published in
July/August 2001. The result is shown here, representing a
reduction in component count of no less than 33.3%! The
audio field has been left though in favour of RF.
This Hartley oscillator can be built from just one FET and a
coil. The coil has a tap to provide the amount of positive feedback
the circuit needs to start and maintain oscillation. The
stray capacitances presented by the FET gate and the coil
wires are enough to make the circuit resonate

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