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
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
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Thank you! Here some images before some modifications I made to wiring...
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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 .
Of course, thanks! Here is the quite messy temporary situation:
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I would restore the Biino ground wiring to how you had it in the previous photos and get rid of the signal star . Keep the input wiring as you have it and connect the phono output grounds back to there own B1 boards output grounds . Leave the power wiring as it is now. Your hum problem might be due to how your system is inter connected .
Just another thought..... is the Biino relay attenuator circuitry ground separated from its own power source ground ?
Thank you so much! I will try! I also suspect there's something wrong with the two amps interconnection after the buffer...
You mean to restore the "ground bus" between inputs and outputs too?
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I think it is...
From the scheme here it seems to be...
06 Schematic Constant Input.png - Google Drive
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