Editing RC oscillator (section)

===Phase-shift oscillator===
{{main|Phase-shift oscillator}}
In the [[phase-shift oscillator]] the feedback network is three identical cascaded RC sections.<ref>{{citation |last=Department of the Army |title=Basic Theory and Application of Transistors |series=Technical Manuals |orig-year=1959 |year=1962 |publisher=Dover |id=TM 11-690 |pages=178–179}}</ref>  In the simplest design the capacitors and resistors in each section have the same value <math>\scriptstyle R\;=\;R1\;=\;R2\;=\;R3</math> and <math>\scriptstyle C\;=\;C1\;=\;C2\;=\;C3</math>.  Then at the oscillation frequency each RC section contributes 60° phase shift for a total of 180°.  The oscillation frequency is
:<math>f = \frac{\sqrt{6}}{2\pi RC}</math>
The feedback network has an attenuation of 1/29, so the op-amp must have a gain of 29 to give a loop gain of one for the circuit to oscillate 
:<math>R_\mathrm{fb} = 29\cdot R</math>

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[[Image:Twin T oscillator.svg|thumb|225px|A twin-T oscillator]]