Electronics > Projects, Designs, and Technical Stuff
Modified second-order low pass filter (third order?)
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hatte:

--- Quote from: bson on February 02, 2020, 09:24:13 pm ---It won't work as a filter at all.  Bypassing Rf is the same as Rf=0Ω, which produces unity gain with Rg loading the output.

--- End quote ---

My point is, that if high frequencies have unity gain, while low frequencies have higher-than-unity gain, it will have SOME low pass filtering properties, depending on the overall gain (Rf/Rg). Why not use this effect in an application like this, where the opamp is required anyway, as a driver for a buzzer?
ogden:
Why don't you design filter from scratch:
https://www.analog.com/designtools/en/filterwizard/
https://webench.ti.com/filter-design-tool/filter-type
hatte:

--- Quote from: ogden on February 03, 2020, 01:12:33 pm ---https://www.analog.com/designtools/en/filterwizard/
https://webench.ti.com/filter-design-tool/filter-type

--- End quote ---

Because I need to understand the design options available to me, preferably introducing as little new hardware as possible.
Once I have the relevant design options, I can start designing the filter.
hatte:
A filter design like this, with a ridiculously high Q factor would provide the filter properties that I am looking for.


Wimberleytech:

--- Quote from: hatte on February 03, 2020, 06:04:44 pm ---A filter design like this, with a ridiculously high Q factor would provide the filter properties that I am looking for.



--- End quote ---

Like this perhaps.
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