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Odd phenomenon when charging.

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By PcFish, Senior Member on 14th May 2014, 04:04 PM
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I'm procrastinating at work, noticed something weird.
When the phone is charging, I glide my fingers across the back, and feel a faint charge, kind of like the phone is vibrating. Maybe my fingers are super sensitive to the grooves in the finish? I don't know.

As an engineer, let's go about this scientifically.

  • Naked HTC One M8 (Gunmetal) with Spigen Tempered Glass Protector
  • OEM HTC Charger that came with the phone
  • Plugged in to a surge protector. The only other thing plugged in is the AC Charger for my HP Elitebook
  • Phone is face down while plugged in on wooden desk

  • Gently glide finger across the back of the phone.

Anyone else feel this? Or am I going crazy at my government job?
14th May 2014, 05:03 PM |#2  
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Just tried it and felt it too!
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14th May 2014, 06:18 PM |#3  
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Next step is voltmeter and phone case vs ground. It's possible that the charger isn't properly grounded, so although it only delivers a potential of 5V, those 5V are sitting on a 50Hz sine wave of, maybe 30-50V (thats a guess based on my experience of electrical shocks).
16th March 2015, 04:12 AM |#4  
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Just tried it and felt it too! Amazing)) Maybe my M7 became a mobile cat? 😻
17th March 2015, 01:56 AM |#5  
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Sent from my HTC One_M8 using Tapatalk
8th September 2015, 05:51 AM |#6  
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I have felt it forever but my baby just felt like that because he was sitting on the charging phone. Suddenly it is more disturbing than neat.
11th March 2017, 06:07 PM |#7  
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I felt it for a long time. I use it as a indicator of charger quality. My HTC one m8 charger that came with the box charged it without any problem at all for the first few days. Then suddenly this vibration arised from nowhere. I tried another m8 charger it didn't cause the vibration. Then i tried some aftermarket nonbrand cheap chargers, all of them caused the same vibration. Then i tried a two samsung charger that came with my two other phone, they didn't give any vibration at all. Then I tried a Xiaomi charger that came with Redmi4prime, it was also perfect. BTW all of the chargers I used are two pin, no ground whatsoever.
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