[sdiy] Odp: Single supply op-amp filter biasing question

[Richie Burnett]

As roman said, consider the filter from a DC perspective... The capacitor impedances go to infinity at DC, so C6 and C7 vanish from the schematic. There is also no current into the inverting input of an ideal op-amp, and therefore no voltage drop across resistor R4 so you can replace that with a wire now too. Now the op-amp circuit *is* a familiar inverting amplifier topology (from the point of view of a DC signal) with R2 and R3 setting the gain and you know the equations for this circuit.

Hope this helps.

-Richie,

Sent from my Xperia SP on O2

---- Roman wrote ----

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