I have just discovered a potential error/fault in my designs about ground connection.
I've just realized that in both machines I built (DAC and amplifier) I connected the single center screw of the power toroids to both chassis on one end and to the circuit ground wire (single point chassis connection) on the other end.
Even if this does not form a shorted turn because there is no a phisical complete loop (a complete path through the center of the transformer through which current can pass) I just realized that parisitic capacitances in the circuits, ground, chassis and connectors (even if are isolated) could close the loop somewhere inside.
I don't have (by ear) ground noise/RF problems, but I think this is a potential building mistake!
I've already moved the chassis connection to another point inside the DAC box and I'm going to do the same in the amplifier which is more difficult. I suspect to have received some listening benefit, but this could be placebo effect.
Is it my suspect (about parisitic capacitances) correct?
I've just realized that in both machines I built (DAC and amplifier) I connected the single center screw of the power toroids to both chassis on one end and to the circuit ground wire (single point chassis connection) on the other end.
Even if this does not form a shorted turn because there is no a phisical complete loop (a complete path through the center of the transformer through which current can pass) I just realized that parisitic capacitances in the circuits, ground, chassis and connectors (even if are isolated) could close the loop somewhere inside.
I don't have (by ear) ground noise/RF problems, but I think this is a potential building mistake!
I've already moved the chassis connection to another point inside the DAC box and I'm going to do the same in the amplifier which is more difficult. I suspect to have received some listening benefit, but this could be placebo effect.
Is it my suspect (about parisitic capacitances) correct?
Attachments
If you really have no other connections to the chassis, yes: all the metal-work will sit at a potential of 1 turn wrt. the GND, meaning capacitance between this false GND and sensitive parts of the amplifier could inject the 1 t voltage (0.3~~1.5V?)Is it my suspect (about parisitic capacitances) correct?
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