I need a lowpass filter that only keep direct current part,w

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darkkeeper

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I need a lowpass filter that only keep direct current part,what a best?
 

Re: I need a lowpass filter that only keep direct current pa

Is this DC to be at a high current? If it is only a signal level, you can use the switched capacitor filters from Analog Devices which can be set to very low cutoff frequencies. You may need to preceded one by a LC type filter if the AC component of the source is high in frequency or voltage.

If the DC is high current you are stuck with the LC type filter.
 

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