Does it make a humming sound when a phone is plugged into the USB portal and charging?
1510637
No it does not. Go back and check your wiring you might have reversed the polarity.
1510638
Hi i own two on them on same ciruit no humming sound while in use. Good luck.
1510639
I have not wired it in yet. Ones made ban other manufacturer do make that noise when they are powering a load. That is why I purchased this version to test for that. Sorry.
2164305
No, it is completely silent operation. My S4 does beep when it "connects" with the charger, but that is the phone setup.
1920718
I have not experienced any noise or humming my self,but,according to Nikon`s web site:'AnswersIt is normal for the batteries to make a quiet humming noise when charging. If there are any concerns please contact support at 1-800-NIKONUS! '
2221518
If I charge it at the same time, it will have the buzzing sound. Otherwise, it is perfect and sound great.
1208486
no, but it works great. my only complaint is that when you dock your phone, it automatically turns music on, when all i want to do is charge it.
1470279
Yep. You can get just a tiny bit of electrical noise when it's charging though. Once it's fully charged, or if it's not plugged in, it's VERY quiet / nearly completely silent.
1014275
Hi, Siarhei. My device does not create any sort of buzzing noise; it merely emits a very short and relatively loud sound when the charger is connected to the vehicle (that is, if one has turned on the charger prior to connecting it to the car). So I would say it is not normal for the device to create a noticeable buzzing noise and would suggest for you to contact Amazon about this issue. Good luck and best wishes!
1585496
Nope - doesn't make a peep of audible noise - just an internal relay clicking after it does it's initial check and switches to charge mode.
522397
I hear no humming associated with this item. I have purchase two of them ( for home & Beach Condo) and have had no problems.
1873819
Not sure if it's normal but mine does too as it's charging. It's great,though, and charges my phone very quickly.
897165
The charger i received does not make any noises, so hopefully it helps you identify the issue. In your case i would definitely try to get a replacement as this noise usually corrseponds to malfunction. To add...my last charger which i replaced made those noises and aoon after stopped charging. Cheers
1665954
It does make a sound but its barely audible. I leave mine in my master bathroom and cannot hear it when its running. If I'm standing next to it, I can hear a very faint hum.
218425
Technically if it is plugged in it is always on. But after months having it constantly on i have yet to hear any buzzing noise or hum.
268489
Mine does not hum, I use it as an automatic transfer switch in the living room, it's been on 24 hrs a day for a month with zero noise. I would return it and try another one.
1025337
It beeps once when you set your phone on it and it has a light that flashes to indicate that it is charging.
456744
I have only done this with the transmitter set up to charge while playing and didn't notice any hum being picked up. I did have it charging off a plug-in adapter (versus being connected to a computer USB port). Just as a consideration, if this is how you intend to use the system on occasion, you might want to purchase higher amperage plug-in USB chargers ...most computer USB's put out very low amperage and if your using the system while it's charging there might not be enough amperage to do both (power the transmitter and charge the battery). Of the two components, the transmitter uses the most power and its power cell exhausts before the receivers. I have only done this with the transmitter set up to charge while playing and didn't notice any hum being picked up. I did have it charging off a plug-in adapter (versus being connected to a computer USB port). Just as a consideration, if this is how you intend to use the system on occasion, you might want to purchase higher amperage plug-in USB chargers ...most computer USB's put out very low amperage and if your using the system while it's charging there might not be enough amperage to do both (power the transmitter and charge the battery). Of the two components, the transmitter uses the... » Read More I have only done this with the transmitter set up to charge while playing and didn't notice any hum being picked up. I did have it charging off a plug-in adapter (versus being connected to a computer USB port). Just as a consideration, if this is how you intend to use the system on occasion, you might want to purchase higher amperage plug-in USB chargers ...most computer USB's put out very low amperage and if your using the system while it's charging there might not be enough amperage to do both (power the transmitter and charge the battery). Of the two components, the transmitter uses the most power and its power cell exhausts before the receivers. « Show Less
1308673
I'm not sure "normal" is the correct word, but yes, I get the electric buzzing as well when I'm using USB on higher draw devices like tablets, and certain phones.