Hi,
a ground loop is a common trap one falls in while digging for the ultimate sound of one's diy amp. Here is my suggestion of a possible configuration with one single psu (consisting of dual supply TPT, one rectifier and at least two caps), and two dedicated amplifier PCB's.
1. Connect every source ground to one single star ground point including all power supplies of any aux element and including, if needed, the earth ground network (anti-parallel diodes, 10R and 100n, all in parallel to earth) close to it.
2. Do NOT Connect the speaker grounds of the two PCB's to this single star point, instead mount the speaker ground chassis outlet terminals to the single star point.
3. Connect the left and right signal channels including ground (common shielded ground lines) to each of the amps.
a ground loop is a common trap one falls in while digging for the ultimate sound of one's diy amp. Here is my suggestion of a possible configuration with one single psu (consisting of dual supply TPT, one rectifier and at least two caps), and two dedicated amplifier PCB's.
1. Connect every source ground to one single star ground point including all power supplies of any aux element and including, if needed, the earth ground network (anti-parallel diodes, 10R and 100n, all in parallel to earth) close to it.
2. Do NOT Connect the speaker grounds of the two PCB's to this single star point, instead mount the speaker ground chassis outlet terminals to the single star point.
3. Connect the left and right signal channels including ground (common shielded ground lines) to each of the amps.
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