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Any comments on this USB Power filter circuit ?

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Posted on February 4, 2021 at 00:08:10
emailtim
Audiophile

Posts: 2295
Joined: July 2, 2017
Any comments on this USB Power filter circuit (LC Filter with ferrite bead) ? From the scope plots it looks like a 3X to 6X improvement over stock.

https://andybrown.me.uk/2015/07/24/usb-filtering/



Thinking it might help clean up a Magic Jack's PS and lower the phone's noise floor.

 

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RE: Any comments on this USB Power filter circuit ?, posted on February 4, 2021 at 11:13:23
Davey
Audiophile

Posts: 2181
Joined: September 26, 2013
That's a standard filter circuit with bead-core inductor. It should be fine.

I bought a bag of these years ago and use them on the power input of nearly everything I build:
https://www.digikey.com/en/products/detail/abracon-llc/ALFB-01/4571339?s=N4IgTCBcDaIKwGY4FoCMYAsCPIHYBMQBdAXyA

Dave.

 

RE: Any comments on this USB Power filter circuit ?, posted on February 4, 2021 at 17:37:17
emailtim
Audiophile

Posts: 2295
Joined: July 2, 2017
Thanks Dave and thanks for the link.

Is there any reason why the circuit is using both non-polaraized and polarized caps ?

TIA

 

RE: Any comments on this USB Power filter circuit ?, posted on February 4, 2021 at 19:08:23
Davey
Audiophile

Posts: 2181
Joined: September 26, 2013
It's because of the size. A gadget like that, most would like it to be very compact. A 10uF capacitor in small size would probably be an electrolytic....thus the polarity.

Dave.

 

RE: Any comments on this USB Power filter circuit ?, posted on February 5, 2021 at 04:56:01
fmak
Audiophile

Posts: 13067
Joined: June 1, 2002
Good stuff as we can see. However, the scope will not have revealed the very high frequency spikes and waveforms.

It is not costly to use a commercial filter. However, the passive onesare not best for sound quality. I like the iFi USB3 with a robust Supregulator inside that also provides an excellent 5V output. My own Jung type unit also performs
very well, can be set any any voltage at 1A plus, and sounds good.

 

RE: Any comments on this USB Power filter circuit ?, posted on February 5, 2021 at 04:59:01
fmak
Audiophile

Posts: 13067
Joined: June 1, 2002
Because the small ones are ceramics and the large one is electrolytic.

The best types should be used for both.

 

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