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bhjazz  
#1 Posted : Thursday, January 2, 2020 5:39:53 AM(UTC)
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.

Edited by user Thursday, February 13, 2020 3:58:19 AM(UTC)  | Reason: Not specified

Brian Donegan  
#2 Posted : Monday, January 6, 2020 8:31:26 PM(UTC)
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Hi. A picture would be helpful.

The one ground you absolutely need is the power ground/Earth to the chassis.

Ground loops occur when you provide multiple paths for elections to flow to ground.

I personally like to keep my signal grounds (in low voltage applications like this) completely isolated from power grounds. I use isolated RCA input jacks, connecting them directly to the volume pot, then to the Ventus boards. If the boards share a ground, share it at the output of the power supply(s) and nowhere else. I would then route the Ventus outputs to isolated output RCA jacks.

Give that a try and see if you still have noise.


[EDIT]: It is also possible that one or both boards is missing it's signal ground (bad connection) which can also cause noise in single-ended setups.

Edited by user Monday, January 6, 2020 8:33:14 PM(UTC)  | Reason: Not specified

bhjazz  
#3 Posted : Tuesday, January 7, 2020 3:42:56 AM(UTC)
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Edited by user Thursday, February 13, 2020 3:58:32 AM(UTC)  | Reason: Not specified

bhjazz  
#4 Posted : Wednesday, January 8, 2020 5:00:41 AM(UTC)
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Edited by user Thursday, February 13, 2020 3:58:42 AM(UTC)  | Reason: Not specified

bhjazz  
#5 Posted : Thursday, January 9, 2020 3:58:14 AM(UTC)
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Edited by user Thursday, February 13, 2020 3:58:52 AM(UTC)  | Reason: Not specified

Brian Donegan  
#6 Posted : Monday, January 13, 2020 9:01:21 PM(UTC)
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First question: what is that filter board (with the caps)?

Second, one the board on the left, there is a signal ground at both input and output. The board on the right there is no signal ground. Where do these lead?
bhjazz  
#7 Posted : Tuesday, January 14, 2020 3:54:54 AM(UTC)
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Edited by user Thursday, February 13, 2020 3:59:03 AM(UTC)  | Reason: more info

bhjazz  
#8 Posted : Saturday, January 25, 2020 4:01:26 AM(UTC)
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Edited by user Thursday, February 13, 2020 3:59:13 AM(UTC)  | Reason: Not specified

bhjazz  
#9 Posted : Sunday, February 9, 2020 2:30:38 AM(UTC)
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Edited by user Thursday, February 13, 2020 4:18:25 AM(UTC)  | Reason: Not specified

bhjazz  
#10 Posted : Thursday, February 13, 2020 4:23:22 AM(UTC)
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Well that was a waste of 30 days.
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