Passive high-pass filter of balanced input breakout board (6 duals inputs)

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electrogeek
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Joined: Sun May 27, 2018 3:07 pm

Passive high-pass filter of balanced input breakout board (6 duals inputs)

Post by electrogeek » Sun May 27, 2018 3:28 pm

Hi,

There is a problem with the input passive high pass filter (C=1uF and R= 47K // 47K)
With the values of components from kicad SCH file (https://github.com/flatmax2/AudioInject ... ed.sch.pdf) , Fc = 1/(2 x PI x R x C) = +-7Hz

Image

When I connect a sinus generator and scope, to have output signal equal to input source, the frequency of the input signal must be more than 7 KHz .

On our input balanced breakout board, all the 12 blue capacitors (C49, 50, 53, 54, 57, 58, 61, 62, 65, 66, 69 and 70) value = 1nF -> Fc = +-7KHz. The resistors (R51, 52, 53, 54, 61, 62, 63, 64, 71, 72, 73, 74, 81, 82, 83, 84, 91, 92, 93, 94, 101, 102, 103, 104) are correctly sized.

Best regards.

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