I've successfully been using caps to filter transients going into digital circuitry in a configuration such as this:
The way I understand it, the caps are there to provide current whenever the supply falters. The smaller cap is supposed to have a faster response than the bigger one, and it's there to tend to very short transients. The bigger cap takes care of the longer lasting ones. The diode is there to prevent the current supplied by the caps from going back into the power supply.
But then @ScottWang posted this diagram:
My question is (and please pardon my ignorance, some of the basics are still not entirely clear to me) what are the inductors there for? Is it because the caps are there to provide current when the voltage falters, whilst the inductors provide voltage when current falters? Or am I saying nonsense because voltage and current are always interdependent?
I've been thinking about simulating this circuit and play with it just to see what happens. But then again the simulation won't be able to explain to me the why of things in plain english.
The way I understand it, the caps are there to provide current whenever the supply falters. The smaller cap is supposed to have a faster response than the bigger one, and it's there to tend to very short transients. The bigger cap takes care of the longer lasting ones. The diode is there to prevent the current supplied by the caps from going back into the power supply.
But then @ScottWang posted this diagram:
My question is (and please pardon my ignorance, some of the basics are still not entirely clear to me) what are the inductors there for? Is it because the caps are there to provide current when the voltage falters, whilst the inductors provide voltage when current falters? Or am I saying nonsense because voltage and current are always interdependent?
I've been thinking about simulating this circuit and play with it just to see what happens. But then again the simulation won't be able to explain to me the why of things in plain english.