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In Reply to: RE: jea48 DC on the line to isolation transformer causing hum? posted by dcuhl on January 30, 2017 at 03:49:16
I'm sure there would be a sonic impact if an inline DC blocker is inserted between an AC outlet and an isolation transformer. However, this issue may be dependent on how sophisticated your AC delivery system might be. Additionally, like other filters, sometimes a filter may do more harm than good as a sonic fix. If the interference is only problematic once in a great while, I suggest you consider how important the issue is.
Here's a finished DC blocker with various AC I/O connectivity options (see link below).
The NEMA AC outlet version looks questionable in terms of audiophile performance potential, while the version with I/O cable glands as strain relief might be the better sounding option if the power cord OD is 16mm (0.63 inch) or less. Another option the seller might be able to provide if asked is chassis-mount Neutrik powerCON High Current jacks, which is a very good sounding AC connector/jack interface for an inline AC delivery application that allows the use of a large OD power cord, IME. Otherwise, I look forward to seeing jea48's response.
Why couldn't the blocker be installed between the hair dryer and the mains wall receptacle? I think it would work the same and block the DC from the hair dryer from going back out on the AC mains.
That seems like a brilliant solution, jea48. The same notion as implementing any kind of AC power line filter effort firstly on the noisy appliance rather than only trying to block audible noise just before the sensitive component involved. Sometimes, audiophile filtering can be effective at both ends of the situation. I'm not an EE, so maybe Jon Risch could post his insights.
Me too and one on the microwave as well, just for grins.
I love the Hum dinger by AVA. Doesn't seem to harm sonics that I can tell. Without it my power conditioner hums like crazy.
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