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HELP NEEDED...Noise from a 4 channel B1 buffer with Biino MK2 volume control...
HELP NEEDED...Noise from a 4 channel B1 buffer with Biino MK2 volume control...
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Old Yesterday, 09:36 PM   #1
Porfido is offline Porfido  Italy
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Join Date: Jun 2008
Default HELP NEEDED...Noise from a 4 channel B1 buffer with Biino MK2 volume control...

Hi everybody... First of all, please forgive my bad english...
I would ask advice about a nasty hum problem I have from a 4 channels B1 buffer with two Biino volume control boards I built...
I tried various wiring ways to improve but none worked...
The situation now is what (maybe) you can see from the weird drawing here...
Can you see something absolutely wrong that could cause gnd loops or something?
I used a gnd loop breaker between psu star ground and earth/chassis...
Thank you so much!

PS. The Biino is a relay attenuator you can see here:

Biino MK2 hifi-electronics.de
Attached Images
File Type: jpg BIINOB1.jpg (174.2 KB, 17 views)

Last edited by Porfido; Yesterday at 09:47 PM.
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Old Today, 11:45 AM   #2
Porfido is offline Porfido  Italy
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Should I maybe try disconnecting psu star from signal?
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Old Today, 11:47 AM   #3
epicyclic is online now epicyclic  United Kingdom
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A photo would help .
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Old Today, 11:52 AM   #4
Porfido is offline Porfido  Italy
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Join Date: Jun 2008
Quote:
Originally Posted by epicyclic View Post
A photo would help .
Thank you! Here some images before some modifications I made to wiring...
Attached Images
File Type: jpg IMG_20200410_160035-min.jpg (1.02 MB, 3 views)
File Type: jpg IMG_20200410_160101-min.jpg (986.6 KB, 3 views)
File Type: jpg IMG_20200410_160235-min.jpg (989.5 KB, 2 views)
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Old Today, 12:09 PM   #5
epicyclic is online now epicyclic  United Kingdom
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Would you post a photo of the current setup taken from directly overhead . There are a lot of white wires to trace .
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