|Yesterday, 11:16 PM||#5831|
Join Date: Mar 2005
"Probably fake, but not bad."
The pot is mounted on the chassis which is to ground.
The pot's ground leg of the potential divider ground to chassis.
I think all 4 of the board's mounting holes are to ground. And it is mounted with standoffs that ground to the chassis.
And then there is the ground next to the 24v which I have ground to the chassis.
Are you saying to remove the ground next to the 24v in, or remove the board's grounding via the mounting holes?
|Yesterday, 11:31 PM||#5832|
Join Date: Jun 2012
Via the PCB standoffs.
You have a lot of potential for ground loops which is probably what you are hearing. Are you using an SMPS power supply? You don't need to ground the chassis. The chassis only NEEDS to be grounded for safety if you are using a linear supply with a 3 prong power cord. An don't use the chassis as any sort of connection from the pot to the PCB or anything like that. You want the wires to be the path of least resistance...once we start introducing unequal paths to ground is where we start getting ground loops. It's OK for the chassis to be grounded, but it needs to not be the path of least resistance.
Maybe a pic would help? Perhaps I am not understanding what you are doing correctly.
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