I've ran into an issue building Carbon.
I'm using split PS boards + separate GRLV.
When I connect PS boards to transformer (without AMP boards) everything is fine, and voltage is +405/-406VDC (bias is a bit low at 563 but that's non-relevant issue and a matter of zener tolerances).
But as soon as I connect AMP boards, transformer starts to heat up a lot (I didn't risk to leave it connected for more that 15 sec). Maybe it will start melting.
Here is my connection:
+400 goes to each AMP's B+ terminal, -400 goes to each AMP's B- terminal (obviously). However GND from each PS from goes to nearest AMP board only and are not tied together or by a sort of star terminal, therefore GNDs are not shorted.
Am I missing a point here? Should connecting GNDs of each split boards remedy the transformer heating problem?
Easy to check by yourself, one must say, but one of my DN2540N5 went bad and I cannot check it right now.
This is my transformer spec (must be plenty of power, so insufficient VA rating must not be a reason?):
1 x AUDIO GRADE WITH EPOXY FILL INTERIOR
PRI:230V SEC:
> 2x 330V under load (350mA) (separate windings)
> 2x 18V under load (500mA) (separate windings)
- VA rating around 300VA