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PO89ZB , an inline DC filter for SMPS wall warts . Preamps, HPA, Korg NuTube, etc
PO89ZB , an inline DC filter for SMPS wall warts . Preamps, HPA, Korg NuTube, etc
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Old 16th April 2021, 01:18 PM   #591
Kartapus is offline Kartapus  France
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You're welcome.

It's a little bit expensive BUT it is very powerfull and no calculation

Note that it exists a non CMS version at Murata. See website of manufacturer.
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Old 17th April 2021, 12:48 AM   #592
ranshdow is offline ranshdow  United States
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Quote:
Originally Posted by thomasnadeau View Post
I wanted to update folks that the kits are now available in the store!

SMPS DC Filter P089ZB Kit diyAudio Store

Dang, I have two sets of parts but no boards, and the board I am after is one with four mounting holes spaced identically to the holes on an RPi: 5.8cm by 5cm, it looks like, so I can stack this filter as the third layer. The diyAudio listing doesn't give the hole spacing measurements nor do the boards appear to be sold bare, and no I don't agree that a diy run of 20+ of these is appropriate use of the world's resources when one really only needs 1 or 2.


But also, my ideal solution would be a board with solder points for a surface mount USB-C receptacle as the DC in. Decisions, decisions.
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Old 17th April 2021, 02:26 AM   #593
Mark Johnson is offline Mark Johnson  United States
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PO89ZB , an inline DC filter for SMPS wall warts . Preamps, HPA, Korg NuTube, etc
It's an excellent "my first PCB layout" project! Very few components, all thru hole, only two layers. Go ahead and create a version that does exactly and precisely what YOU want! You'll have fun, you'll learn a new skill, and you'll have the option to make appropriate use of the world's resources by purchasing only 3 of them (from OSHPark).
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Old 17th April 2021, 02:38 AM   #594
avdesignguru is offline avdesignguru  United States
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ranshdow:
JLCPCB will do 5 boards for less than $9 including standard shipping to the USA. Just lay it out in KiCad and plot the gerbers. It's a very simple circuit. Current sense resistors are 12mm pad-to-pad with 1.3mm drill hole. Note the cathode (K) on the TVS devices and correlate with the data sheet.
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Old 17th April 2021, 02:45 AM   #595
ranshdow is offline ranshdow  United States
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Thanks for the suggestions, both. If I want to go overboard on my first attempt and have it come with a USB-C receptacle already soldered, that would do it for me. I've seen at least one of the diyaudio boards for sale that looks like it come with the smt devices already on them- Wayne's burning amp thing I think.
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Old 17th April 2021, 10:09 AM   #596
1883 is offline 1883
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PO89ZB , an inline DC filter for SMPS wall warts . Preamps, HPA, Korg NuTube, etc
https://www.mouser.com/ProductDetail...mYjFvszQ%3D%3D
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Old 17th April 2021, 03:31 PM   #597
ranshdow is offline ranshdow  United States
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I suppose these are the (most) relevant pieces of information from this spec sheet.


Knowing nearly nothing, I'd wonder looking at this that these devices don't have any protection against resonance (I mean oscillation) like Mark's design does, nor does it have any diode protecting the circuit from flipped polarity. I don't recall what the frequency response/attenuation characteristics of Mark's design is either, something about 65MHz cutoff maybe (I thought this was basically a low-pass filter)?


(edits in parenthesis)
Attached Images
File Type: png QNFH9101.png (81.6 KB, 206 views)
File Type: png QNFH9101_schem.png (10.6 KB, 205 views)

Last edited by ranshdow; 17th April 2021 at 03:34 PM.
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Old 18th April 2021, 05:51 AM   #598
ranshdow is offline ranshdow  United States
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I think this is what I want, it's pretty simple- basically a PO89ZB circuit which takes input power from a USB-C receptacle fed by an official 5.1V 3A RPi wall wart. The filtered power output of the PO89ZB is then fed into the 40-pin HAT expansion board headers at appropriate pins, with the option on the PCB for a header in either the standard HAT location or the expansion board location. I want jumpers to be able to disconnect both power and ground from the HAT headers in case there is an issue. There will be a separate 2-pin header that will always be live, for power monitoring or direct wired connection to elsewhere on the RPi or expansion boards (the unterminated wires).


You may notice I'm taking all four of the USB-C lines (A4, A9, B4, B9) marked as "+" on the wall wart as power in to the PO89ZB, and all four (A1, A12, B1, B12) marked as "-" on the wart as ground. Also I'm feeding more than one, but not all, of the P5V and GND pins on each HAT header with the output of the PO89ZB. I don't know if this is kosher or not. My thinking is it shouldn't hurt to have parallel input and output paths.


Anyway, if anyone sees anything gross on this before I attempt to figure out part sizes and lay out the PCB, or have other suggested functionalities, I'd much appreciate it. Also if anyone knows an outfit that would both make the PCB and mount the USB-C receptacle (I'm pretty sure these are all SMT and I have zero experience with that), that would be awesome. Thanks for reading, thanks avdesignguru for the hints and the nudge to get me to try this (my first!), and thanks so much Mark for making such a useful filter.
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File Type: png RPi P089ZB HAT.png (79.2 KB, 198 views)
File Type: jpg Rpi_supply.jpg (171.0 KB, 199 views)
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Old 18th April 2021, 01:20 PM   #599
Mark Johnson is offline Mark Johnson  United States
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PO89ZB , an inline DC filter for SMPS wall warts . Preamps, HPA, Korg NuTube, etc
Maybe it might make your project a little easier if you used an inline USB jack for cable-to-cable inline connections. Then you don't need to find or create a PCB footprint, you don't need to source the component, and you don't need to stuff and solder it into the board.

Amazon sells USB Extension Cables for $6 such as the one in the photo below. Cut the cord midway between the jack and the plug, strip the external protective jacket and the individual wires, and then just solder them to plain ordinary holes in your PCB. And of course provide a mechanically safe, strain relieved, passage from outside the chassis to inside the chassis.


_
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Old 18th April 2021, 03:49 PM   #600
ranshdow is offline ranshdow  United States
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As a hack, sure but I'm going for a little higher quality implementation this time around. Also an exercise in design and fab for me. There are so many little e-parts out there with high production value, it would be nice to see if I could pull that off. Been doing the spliced cable thing for the testing I did; the final result on my B1 Korg is hidden & clean.
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File Type: jpg IMG_5240.jpg (433.1 KB, 106 views)
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