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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 Yesterday, 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 Yesterday, 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
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Old Yesterday, 05:42 PM   #323
konst is offline 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 Yesterday, 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 Yesterday, 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, 48 views)
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Old Yesterday, 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 Yesterday, 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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Last edited by SuppersReady; Yesterday at 10:26 PM.
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Old Yesterday, 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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