Where do you return your load?

[rgrayton]

1. amp pcb ground plane?
2. star ground, before amp pcb?
3. star ground at ps?

[Russ White]

Originally posted by rgrayton
1. amp pcb ground plane?
2. star ground, before amp pcb?
3. star ground at ps?

3, but that could also be on he AMP PCB.

[rgrayton]

Hi Russ, I used to live in Bristol, TN and there I learned NASCAR, Vols and Country Music.

I am using Brian's kit and there are both pg+ and pg- on the board. My inclination would be to go to a point equal each, off the board ("star").
But, here is a follow ? Would you return all the channels (eventually 6, for me, but that should really not be any different than 2) to a mutual ps star, or each load return to its own channel?
THX,
-BG

[Russ White]

My guidance is to make all GNDs terminate at the star GND, so if you have 6 channels all with the same PS, then each channels GND should go to the star GND. The star GND is usually best placed bettween the final caps on the PS.

I hope you enjoyed TN. I love it here. Lots of music

[rgrayton]

My guidance is to make all GNDs terminate at the star GND, so if you have 6 channels all with the same PS, then each channels GND should go to the star GND. The star GND is usually best placed bettween the final caps on the PS.

How does one define 'same PS'? I am using a single 800VA +/- 25V, 2 diode bridges per ch (one ea rail) on a single pcb, power gnd for each on the ps pcb. Still one star for all channels?

[wes-ninja250]

rgrayton -- I have a similar setup to you (twin 3886 boards, twin PS boards, one transformer). My current plan is to create two adjacent star grounds and to join them with a very short, thick wire.

Hopefully, I'll be done this weekend or sooner and can let you know how it works out.

If you beat me to getting done, let me know what you did and how it worked, eh?

Wes

[Russ White]

Well in your case you would bring each channels PGND to it respective PS PCB. But just keep in mind, your PS are not isolated from eachother at all if they share a common trafo, and really it is the trafo that sources the GND reference. It should work just fine though. Just be very careful with your cable dressing.

[rgrayton]

not to beat a dead horse, but getting back to the load rtn - return them, ea ch, to the respective "stars" for each ch, then, and in the the words of our friends to the north, eh?