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SMPS DC Filter P089ZB Kit

  • 1000

The PO89ZB, an inline DC filter for SMPS wall warts, preamps, HPAs, Korg NuTubes, B1, etc.  

This filter is limited to single rail 48V DC, 3A applications.  The kit contains top-quality parts as selected by the circuit’s designer which includes KEMET ESH477M050AH4AA or Nichicon UHW1H471MPD capacitors and top-quality Bournes  inductors RLB0912-2R2ML.

Note that the kits will use either the Nichicons or Kemets depending on availability as these are often difficult to source. Both are considered the top two choices for low-ESR caps for the circuit and users will be happy using either.

For more information about the filter see the thread.

Included in this kit:

  • PCB
  • R1, R3: 0.04R 5% 1W current sense resistor, LS 12mm
  • R2, R4: 953ohm 1% 0.25W resistor
  • C1, C2: 470 uF 50V capacitor, LS 5mm and Diam 10mm
  • L1, L2: 2.2uH 7.5A 0.10R inductor, LS 5mm and Diam 9mm
  • D1: 68V Unidir TVS 600W, DO-204 pkg


Customer Reviews

Based on 9 reviews
Jaap B.
Great with NuTube preamp

Sounds great with NuTube preamp and Purifi Eval1.


A great device works great and handy having all components in kit

Peter B.
SMPS filter

Having recently built a ACP + and decided to use a Meanwell internal 3amp SMPS. I already have a lot gear using linear supplies, as I have been wary of using SMPS supplies in the past and putting out 'gunge' into the supply. However, I am thinking things have improved in their design and a lot of audio manufactures seem to be using them now as well. And as I like leaving stuff on, I thought why not try and save a few dollars on the electricity bill. This filter is very well priced and easy to implement. Not sure how much difference it makes but the ACP+ sounds very good to me.

Works As Designed

Easy to build...and works great!

Steve W.
Love it

Beautiful little kit, have only tested it with my Starving Student HPA and it definitely adds transparency to the sound. This kit is highly recommended!!!

Glen C.

Easy to assemble. All parts needed are included. At this price it would make a good kit to practice soldering.

Greg S.
Great Kit

Hello, This is a great little filter project at a great price. Not much else that can be said, works as advertised.


Gave a couple of these to a microwave engineer for a very cheap power supply he had hoped to use but was too noisy. It reduced the noise by more than 100 to 1, and made the PS usable!

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