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by oldbbsnickname
992 days ago
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There was an audible digital clock noise (of the phone) "ground loop" when charging an iPhone 6S on the same ground potential as wireless headphones Bose QC 35 (v1) while also charging the headphones AND connected via the analog headphone jack to the phone. (The noise was very loud in the headphones while operating in a passive analog input (powered off) while charging.) Moving either charger to a different ground potential removed the issue. There was probably a missing backfeed filter diode on a ground track or decoupling capacitor somewhere in the headphones' charging circuit. |
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