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Description
English: Schematic diagram of a twin T oscillator, a type of RC oscillator. It is a feedback oscillator that produces a sinusoidal output. The circuit in the blue box is a twin T filter; it is a notch filter which passes signals at all frequenies except at its notch frequency. Positive feedback required to make the circuit oscillate is applied to the noninverting (+) input of the op-amp A through the voltage divider R3 and R4. However at all frequencies besides the notch frequency, the twin T filter applies the same signal to the inverting (-) input, so the loop gain is far below unity at those frequencies. Only at the notch frequency is the loop gain above unity, so the circuit oscillates at that frequency.
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Author Chetvorno
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Circuit of a Twin T oscillator

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11 August 2015

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Date/TimeThumbnailDimensionsUserComment
current04:39, 9 May 2017Thumbnail for version as of 04:39, 9 May 2017761 × 517 (25 KB)ChetvornoReplaced invalid Inkscape SVG version with "plain SVG" version that passes validation
11:17, 11 August 2015Thumbnail for version as of 11:17, 11 August 2015761 × 517 (31 KB)ChetvornoUser created page with UploadWizard

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