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AndyT
2
Oct 11, 2016
Just a heads up to anyone that is having issues using their analogue mic on a cheap "PC Gaming headset" with the FX-Audio over Optical digital. The FX-Audio's power supply is floating since there is no grounding pin. Your PC is most likely earth referenced unless you're on a laptop without grounding for the power supply. The differential in the ground to the floating is so great that it will cause hum to be picked up over the mics cable (This is the case for my HyperX Cloud); so the mic will be unusable in this particular configuration.
AndyTHi, There are a few ways to tackle this issue: my (powered, floating ground) dac and (floating ground) preamp were having a differential of voltage with both earth grounded components: the crossover and the source pc. This can be caused by an inconsistent ground state between the dac and pc, either by using a bad usb cable or with an optical connection, as well as having multiple grounded systems on isolated power banks .
Since there was no electrical return between the pc and the dac, the dac tied itself over the rca connection to the floating ground of the preamp, causing significant noise. This problem was easily resolved by grounding the preamp to the pc chasis using a bit of hookup wire screwed down with chassis screws on either end. This eliminates the voltage differential between the devices (you could ground the dac to the pc chassis in the same manner).
Secondly, putting a galvanic isolation block like this: https://www.amazon.com/gp/product/B000KUD2G4/ref=oh_aui_search_detailpage?ie=UTF8&psc=1 Between the preamp and earth grounded crossover elecrically seperated the ac and dc portion of the signal and blocked the ac voltage from passing, eliminating any issues related to their voltage differential.
Either one will improve it dramatically, with both, it's very quiet.
bravomail
125
Jun 26, 2018
AndyTI got cheap 12V 6A PS off amazonas.. Solved all the issues.
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