Electronic apparatus for biological research electronicappara00dona Year: 1958 Figure Low-pass R-C filter fed from a real generator When a low-pass filter is fed from a real generator of internal resistance r, the eifect is to alter the value of resistance required in the filter. For a given turn-over frequency cjq, the total R required {Figure ) is If Ceo. Since R=\/Cmc r ^y^ t'out Figure we already have r, the value of R' required is only (IjCoj) — r. There is no reason why we should not dispense with R' altogether, connecting C directly across the terminals of the generat

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Electronic apparatus for biological research electronicappara00dona Year: 1958 Figure Low-pass R-C filter fed from a real generator When a low-pass filter is fed from a real generator of internal resistance r, the eifect is to alter the value of resistance required in the filter. For a given turn-over frequency cjq, the total R required {Figure ) is If Ceo. Since R=\/Cmc r ^y^ t'out Figure we already have r, the value of R' required is only (IjCoj) — r. There is no reason why we should not dispense with R' altogether, connecting C directly across the terminals of the generator. Then the value of C required is simply l/cocrf (Figure ).

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