Low Pass Filter / SMPS

Tube DIY Asylum

Do It Yourself (DIY) paradise for tube and SET project builders.

Hi,

As I'm not a filter nor SMPS expert, I have the following question:

To filter out unwanted high frequency noise from the output of an SMPS, I could use an LR low pass filter after the SMPS not?

When I use online calculators, they suggest I could use a 100mH choke and 0.13ohm resistor (basically a piece of wire) to achieve -40dB attenuation @ 10KHz.

This sounds too simple because then all SMPS's should have this filter build in.

What am I missing?

NC

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K&K Audio / Lundahl Transformers

[ K&K Audio / Lundahl Transformers Forum ]

Topic - Low Pass Filter / SMPS - Nickel Core 05:36:25 07/21/15 (4)

You need an LC filter - Triode_Kingdom 16:40:06 07/21/15 (0)

RE: Low Pass Filter / SMPS - Paul Joppa 13:01:20 07/21/15 (0)

I 'missed' Common Mode Noise at least... (nt) - Nickel Core 06:21:58 07/21/15 (1)

RE: I 'missed' Common Mode Noise at least... (nt) - beautox 14:28:16 07/21/15 (0)

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