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Crossover Noise Issue
Crossover Noise Issue
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Old 18th June 2020, 05:15 AM   #1
DQ828 is offline DQ828  Australia
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Default Crossover Noise Issue

I have built the crossover shown in the images below and there is an issue with excessive noise when both boards are connected to the bipolar power supply.


If I unplug the power from either of the boards the noise issue goes away, I'm assuming it is a grounding issues but I'm not sure how to fix it.



I was hoping someone might be able to suggest the best approach.


PS: It amazing how much dust gets thru the vent holes
Attached Images
File Type: jpg Crossover 3.jpg (466.8 KB, 32 views)
File Type: jpg Crossover 2.jpg (427.1 KB, 31 views)
File Type: jpg Crossover1.jpg (407.7 KB, 30 views)
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Old 18th June 2020, 05:29 AM   #2
Mark Whitney is online now Mark Whitney  Netherlands
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Give each board there own transformer, PSU and Ground loop breaker. Did you use a HBR on the inputs?
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Old 18th June 2020, 06:00 AM   #3
DQ828 is offline DQ828  Australia
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Mark

Thanks for the input.

I have done 2 other projects similar to this and had no issues with noise. The image below shows a project where is used the Linkwitz crossover boards to drive my speakers and had no noise issues.

There must be a simpler way


PS: Whats a HBR and what input are yuo talking about?
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File Type: jpg Linkwitz.JPG (211.9 KB, 28 views)
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Old 18th June 2020, 08:24 AM   #4
DQ828 is offline DQ828  Australia
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Default FIXED :)

Well the noise is gone, it's amazing what 1 little green wire can do. I realised after loading up the Linkwitz crossover photo that the board grounds are connected via one of the mounting holes and metal standoffs. The other boards dont have the ground attached to any of the standoff holes so I cobbled something together off the woofer grounds and the noise went away, which I am VERY happy about
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File Type: jpg Little Green Wire.jpg (693.0 KB, 22 views)
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