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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 17th January 2021, 03:23 PM   #321
SuppersReady is offline SuppersReady  United Kingdom
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PO89ZB , an inline DC filter for SMPS wall warts . Preamps, HPA, Korg NuTube, etc
I've been having fun today trying them out with my ACP+ and Grado 325s. You can hear a difference with one in circuit. The difference with two is even better. Lots and lots of extra musical details. Spatial positioning of instruments is truly excellent. Now I just need to get a case and then try it through my main system.

Second opinion from SWMBO, "It's like putting your glasses on, it brings things into focus."

This afternoon's project is to try them out on the Starving Student II and, if time allows, the B1K in the office system.

I hope that you all enjoy them too.
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Old 17th January 2021, 04:50 PM   #322
1883 is offline 1883
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PO89ZB , an inline DC filter for SMPS wall warts . Preamps, HPA, Korg NuTube, etc
Default Pictures please

Pictures please.
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Old 17th January 2021, 05:42 PM   #323
konst is online now konst  United States
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PO89ZB , an inline DC filter for SMPS wall warts . Preamps, HPA, Korg NuTube, etc Send a message via MSN to konst
Last night I tried the Salas UBiB regulator on my B1Korg, the benefits of hte PO89ZB are very much evident even with that low noise regulator. The measurable (with my skills) difference in noise seems to be very small, yet it realy does work even there
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Old 17th January 2021, 06:31 PM   #324
Fast Eddie D is offline Fast Eddie D  United States
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This is very interesting. I tried to make a filter like this with inductors I pulled out of a switching power supply. It did attenuate the noise, but not nearly enough. It made a slight improvement but the headphone amp clearly sounded better with an old fashioned wall wart powering it.

I was wondering if the circuit could be scaled. For line level circuits and class AB headphone amps I was thinking of using 0.4 ohm or 1 ohm series resistors. It sure would be handy to use some of these laptop supplies for audio projects.

Inductors out of stock https://www.mouser.com/ProductDetail...BdHMSEZA%3D%3D but they're affordable and not too big.
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Old 17th January 2021, 08:46 PM   #325
Monk55 is offline Monk55  United States
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PO89ZB , an inline DC filter for SMPS wall warts . Preamps, HPA, Korg NuTube, etc
Completed 24v supply for Korg B1. Filter in the corner.
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File Type: jpg 8E6FDD1B-BC43-49C3-A785-14359D64B548.jpg (984.5 KB, 240 views)
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Old 17th January 2021, 10:16 PM   #326
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
Lovely build, @Monk55! Wasn't expecting to see a 200 watt SMPS (140 watts without fan) in there.
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Old 17th January 2021, 10:20 PM   #327
SuppersReady is offline SuppersReady  United Kingdom
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PO89ZB , an inline DC filter for SMPS wall warts . Preamps, HPA, Korg NuTube, etc
Since you asked 1883,

Not pretty, but easy enough to do.

It allows me to try it on any of my preamps.
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File Type: jpg 20210117_220644.jpg (854.5 KB, 239 views)
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Last edited by SuppersReady; 17th January 2021 at 10:26 PM.
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Old 17th January 2021, 10:29 PM   #328
1883 is offline 1883
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PO89ZB , an inline DC filter for SMPS wall warts . Preamps, HPA, Korg NuTube, etc
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Thank You
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Old 18th January 2021, 02:11 PM   #329
Monk55 is offline Monk55  United States
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PO89ZB , an inline DC filter for SMPS wall warts . Preamps, HPA, Korg NuTube, etc
Just about as small as can go...
Boxes:

LeMotech 5 Pieces Plastic Project Box es Junction Case for Electronic Project, Black 3.15 x 1.97 x 1.02 inch (80 x 50x 26 mm)

Jack’s:
5.5 x 2.1 MM 10A DC Power Jack Socket Dc099 30V Threaded Female Mount Connector Adapter with 3.94 Ich 18AWG Cable and DC Barrel Jack Plug Male Lsgoodcare

Siliconed board to box.
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File Type: jpg 46D7AF5E-E598-434E-8CB4-D9C15094AF48.jpg (980.2 KB, 213 views)
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Last edited by Monk55; 18th January 2021 at 02:13 PM.
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Old 18th January 2021, 02:31 PM   #330
kasey197 is offline kasey197
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PO89ZB , an inline DC filter for SMPS wall warts . Preamps, HPA, Korg NuTube, etc
These are awesome ! I also enjoyed the company of a super simple (standard 5 component) cap multiplier after the passive filter ... just sayin
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