| 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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