SSE mod
want to have-build in USB DAC, (use to be installed inside PA CASE), is it ok to use secondary winding of power transformer (5 VAC5/5AR4 filament) as a source for DAC power supply.
Another question how to organize grounding to avoid loops, 2 PCB for DAC with 5V power, USB input, L-GND-GND-R output.
want to have-build in USB DAC, (use to be installed inside PA CASE), is it ok to use secondary winding of power transformer (5 VAC5/5AR4 filament) as a source for DAC power supply.
Another question how to organize grounding to avoid loops, 2 PCB for DAC with 5V power, USB input, L-GND-GND-R output.
Not if you are already using it as the rectifier heater. If you are, the winding is elevated to a DC offset that matches your B+. You don't want that.
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