NOYITO Power Filter, DC LC Filter DC EMI, 0-50V, 2A/4A/10A/20A, Terminal Block, Yellow PCB Board, Vehicle Amplifier Noise Filter

This 3 stage filtering board does a great job of cleaning up the DC voltage from a switching power supply.I had a 3 volt DC switching power supply for a radio. I wanted to use the radio's audio headphone output to go into another device on a permanent basis. With the DC power supply, the headphone output had a fair amount of static and general noise. On battery only, the radio was perfectly clean sounding. Using this filtering board, the noise and static level was eliminated from the power supply. I also added a ferrite core with 3 loops in it after the filtering board (which made very very little difference, but just icing on the cake). As long as you use the correct one for the amount of current you are using (always over the current never under), and keeping the supply voltage at half or below, this product will do a very good job of cleaning up the output voltage of your switching power supply.

Fabulous module for cleaning up d.c. power sources.

I have these connected to a SMPS output. I was seeing 580mv noise spikes from the PS and these units on the output side knock that down to 180 - 200mv, so they are doing what they say. I wish there were more high current choices, but these 20 amp modules are working for me right now. I would also like to see the manufacturer to provide more data on what to expect including a schematic.

It smoked and burnt up. Once I connected it to a 12v.

Knocks the hum out!