headphones shocking me on treadmill at gym

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TechBoyJK

Lifer
Oct 17, 2002
16,699
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At the gym I go to, they have tv's in front of each treadmill. Each treadmill then has a little pod receiver so that you can tune it to the tv, and listen with headphones.

I've been going there for several months, and never had this problem.

I'm getting strong shocks in my right ear via the headphones.

Ive been using a pair of $10 at best buy sony earbuds, that I've had several pair of, and havent ever had thsi problem with. A few nights ago, I stepped on my current pair, and cracked the right cover a little bit. It snapped back on, but a small piece of the trim is missing and exposes a little bit of the earbud speaker. Keep in mind, I also use these same headphones when I ride the metrolink (stlouis light rail) to work and back. I hook them up to my blackberry. I didn't have any shocks from it.

I take same headphones to the gym, get on treadmill like I normally do, and about a minute into the run I get a pretty intense zap in my right ear, obviously coming from the earbud. I'd say it was at least as intense as sticking your tongue on a fresh 9volt.

I figured it was the slightly exposed speaker part, left the right ear bud out, finished my run and made sure to grab a different set of ear buds for the trip.

Today, I again used the busted sony headphones on my way to work, and no problems. No zaps.

I brought a different set of headphones to the gym, thinking maybe it was static electricity building up and getting to my ear since the speaker was kind of exposed. i get on a different treadmill, with a slightlly different model receiver, and about a minute in, ZAP! and then the volume on the receiver dips for a few seconds. Different treadmill, different earphones, same right ear zap.

WTF? I'd say maybe just static electricity, but I never had that problem till recently. Any ideas? The girl that works there said she hasnt heard any other complaints. I was thinking maybe these receives have a bad ground or something.
 

TechBoyJK

Lifer
Oct 17, 2002
16,699
60
91
its shocking me before i break a sweat. I run for about 30 minutes, its happening within the first minute.
 

JMapleton

Diamond Member
Nov 19, 2008
4,179
2
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its shocking me before i break a sweat. I run for about 30 minutes, its happening within the first minute.

You gotta break a sweat first homeboy.

Like all Anandtechers, I do 40 reps with 80lb dumbells as a warm up.

No seriously, maybe wet your clothes up a bit with some water or wait until later to do the treadmill.
 

Rubycon

Madame President
Aug 10, 2005
17,768
485
126
Wear one of these.

WRIST-STRAP.jpg


The indoor humidity is probably low allowing static to build up. The machine should be grounded and the shield of the TRS 1/8" connector SHOULD be at the same potential as well.
 

Jeff7

Lifer
Jan 4, 2001
41,596
19
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Yeah, I'd go with Ruby's suggestion. You're likely running with insulated shoes on what amounts to a rubberized conveyor belt, and with your clothes rubbing against you like Oroo said. Either ground yourself to the treadmill with a wrist strap, or else build some kind of optoisolator circuit, with a section of fiber optic cable to transmit the signal. Then you'd just have to watch for some very nice sparks when you finally touch some metal part of the treadmill. :D
 

dighn

Lifer
Aug 12, 2001
22,820
4
81
Yeah, I'd go with Ruby's suggestion. You're likely running with insulated shoes on what amounts to a rubberized conveyor belt, and with your clothes rubbing against you like Oroo said. Either ground yourself to the treadmill with a wrist strap, or else build some kind of optoisolator circuit, with a section of fiber optic cable to transmit the signal. Then you'd just have to watch for some very nice sparks when you finally touch some metal part of the treadmill. :D

thirded. it might look funny but it's the surest way to avoid shocks. the charges will leak as soon as they are generated instead of building up enough potential to jump the headphone and shock you.
 
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