NOYITO DC LC Filter DC EMI Power Filter 0 to 50V 2A 4A 10A 20A Filtering Board (4A)

Knowing some about electronics I knew what I needed. However was unsure what quality I would find for 10$. Funny this little thing works suprisely well. good price for what it does. Although for some reason it takes a few seconds to work (no idea why) after that it kills the dc noise. I used it to eliminate the dc from the 48v battery in our golf cart to the sound bar handing in the rear (Evolution Golf Cart). I just spliced it inline with the two dc wires and it works. Seems to be well built. Was easy to install.

I purchased the 20A LC filter because the Meanwell LRS-600-15 switching power supply I just bought to power my ham rig introduced lots of noise in the receiver. The Meanwell power supply goes into pulse skip mode when the current draw is low to help with voltage regulation and also lowers power consumption. Well, this pulse skip mode introduced a lot of interference in my radio's receive. I installed this LC filter inline between the power supply and the radio, and all interference is gone!! Truly incredible!! Quality is fantastic!

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.

I have been experimenting with a 1969 JLH Class A audio amp (provided with fake 2N3055s unfortunately) that requires 24v, 5amp DC supply. I initially powered up the amp with a linear bench supply that pushed only 15v and it sounded fine but at 15v scope showed clipping at about 5 watts, although again, the amp sounded fine at low level. Since I had a meanwell 24v, 5a SMPS handy, I tried that. Hmm, not so good. Mids and highs sounded somewhat "compressed" and "scratchy". SMPS supplies are infamous for outputting high frequency noise. Switch back to linear supply, mids and highs good again! So I tried the 20amp version of this unit even though my amp draws < 2 amps. YES, noticeable improvement in the mids and highs. Now I can use the SMPS instead of hot, heavy, and ineffcient linear supply. I do not have a 5000 mhz, 24" touch screen, 12 channel megabucks scope so I cannot confirm with instrument measurements that the high frequency SMPS noise is reduced. But I listen to a LOT of hifi, and I trust my ears. Does that $25 amp now sound as good as my $2K Musical Fidelity Class A? No. But for $25 I will replace the fakes with authentic 2N3055s and see how that sounds. Another $50 just for the authentic power transistors though...

Tried it with several switching power supplies. No help.

Product as pictured but no loss of high frequency noise in guitar pedal. Joyo ZGP reduced x10

The picture makes it difficult to determine the size of this device. Having received and inspected, there is no way that it is capable of handling a sustained 20A current. The terminal screws are small and not sufficient to engage a lug from a 12AWG cable. The overall filter design is sound, but these are not fit for purpose at the advertised rating.

Great product, works well for my applications. Good price and shipping.

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

DC filter started to make a "physical noise" when running at 16 AMPs peak ( 20A version purchased) .. Not suitable for application ...