Hey all,

http://www.electronics-tutorials.com/oscillators/oscillator-basics.htm shows a Hartley oscillator and a Colpitts circuit.  There is a formula for finding a frequency of a Colpitts oscillator, but not a Hartley oscillator. I believe I need a Hartley oscillator for my design with a frequency of about 100kHz or about 1MHz. Could someone please suggest a formula to work out what values of componants I would need.

(I will have a variable capacitance.)

Thank You

I'm working on a control system like a Theremin. I want the oscillator frequency to change with a changing capacitance caused by a hand moving near an aerial. I figured on the Hartley because of the changing capacitance, the simplicity (cost being a factor in the design) and the feedback ration being constant seemed like a good idea.

Thank You.