Quote:
Originally Posted by sonorliteman
I'm not sure what parts are in these voltage stabilizers, but one good form of capacitor input filter combines capacitors with an inductor which dumps the excess ripple to ground leaving nearly pure DC output. These are referred to as pi-filters too.
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The inductor is actually in series with the load, here's a
link showing a typical pi filter , it's the second circuit from the top. It doesn't look like the "voltage stabilizer" products are implementing a pi filter since they appear to just connect across the battery terminals in parallel with the load.