Audio1Man said:Powering up the PCB ASSY on the bench you need to jumper the grounds. Once the "i #22) connects to Ground the regulators will work. The Ground connection is made through other circuits on the other PCB's.
If the jumper is placed inside the "red circle" there will be some ground currents that will increase the "HUM LEVEL"
But it is a hierarchical layout. Pin 04 of the card is the filter cap ground. Whatever that plugs into probably has a bus of points connecting to various things like the chassis, earth ground, other cards. Its the "star" in star grounding. It seems potentially superior to me actually because the regulators just need a sense of what ground is but you want high currents to return directly to the filter caps (preferably alongside supply lines).Kingston said:A thing of note is that not using a hierarchical ground and resorting to this kind of unusual configuration reeks of PCB layout and design issues. And they leaked all the way to the schematic which is not ideal.
squarewave said:It seems potentially superior to me actually because the regulators just need a sense of what ground is but you want high currents to return directly to the filter caps (preferably alongside supply lines).
The major half wave rectified current is returned via a direct path to the transformer CT. The clean side of the ground break only sees ripple voltage through a RC filter.Monte McGuire said:If those supply currents have a signal component, especially a half wave rectified signal component,. one could also argue that they should be sourced, terminated and hopefully cancelled local to the circuits that generate and consume them, and not all the way back to the supply.
There are numerous concerns when summing a large number of signals.Having rectified signal current flying around a large console is a recipe for muddy sound when you have a lot of channels summed to mix.
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