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DIY Switched Capacitor Filter

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Some time ago, we were mulling over how to add some electrical inertia to a fuel level detector. The filter element requirements were such that any conventional circuit would be impractable. I suggested a topology that would switch the current to a capacitor to allow for more reasonable circuit values. I tired to simulate the idea to further illustrate it, but my attempts were unsuccessful. I vowed to someday return to that simulation, as I knew it should have worked.

That day came. Here is the conceptual circuit. The three traces are for:

10% duty cycle: Blue

25% duty cycle: Red

50% duty cycle: greenish-blue

So, the circuit might be practical. We'll have to see how it works in a real circuit.


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