Computers & Hardware > Other Technologies & Hardware
Bluetooth headphones
Weaver:
My Sennheiser headphones have a faint mains hum when I have the dc power cable into them. The obvious cure is to disconnect the cable, but then of course the battery goes flat because I forget to reinsert it when I am not using them. Any suggestions? What about some kind of filtering?
The power cable is a USB-to-some really strange looking flat connector.
sevenlayermuddle:
If it is a steady hum, ie it doesn’t come and go with movement and orientation, and it hasn’t always been there, my guess would be a hardware failure. Most probably imho, a faulty decoupling/smoothing capacitor. Electrolytic capacitors tend to be a weak point in any modern apparatus, “modern” as in mid 20th century onwards.
Might be worth trying a different PSU. Any chance the “flat connector” might be a USB-C?
Weaver:
I wouldn’t know about usb-c haven’t knowingly encountered one - it’s really small on the bottom of one of the headphones. But from the pictures of usb-c this doesn’t look right as my connector does not half 180 degree rotational symmetry, it has little bumps and microscopic recesses on one side, and it has two sharp pointy corners and two rounded corners rather than two rounded ends.
I have had the headphones themselves repaired a while ago.
tubaman:
The connector sounds like it is micro-usb from your description, which from a quick Google check is a type that Sennheiser use.
As suggested by @sevenlayermuddle my first thing thing would be to try a different PSU as they do vary in quality greatly.
Another option might be to try a USB power bank to charge/power the headphones. You would of course need to remember to charge that too, but it would run them for longer than just their own batteries. What I don't know is if you can use a power bank like a mini UPS - ie charging it and pulling power from it simultaneously (and whether that would make any difference to the hum anyway?). Others may be able to advise.
:)
Weaver:
I got a power bank for my wife, to charge her iPhone. That’s a good idea, as it banishes all mains from the whole system. Thank you very much!
I tried plugging it into different devices, first into a usb socket on a Belkin mains distribution block which also has a usb output. Then tried it into an Apple white usb mains power adapter thingy -don’t know what it’s called. Hum still persisted though.
The sound quality in these headphones is not that great given that they cost a small fortune. There is persistent low level white noise, which I would have hoped is a thing of the past. They have an environmental noise cancelling facility which is excellent.
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