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Author Topic: Rewiring wireless headphones, question about ground/negative.  (Read 1928 times)

nemattoad

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I've got a pair of wireless headphones I am repairing and I have a question about the wiring.

On the PCB, there are 4 labelled solder points: Left -, Left +, Right -, Right +.

My question is, are Left - and Right - the same thing, because if so, I'd like to save some wire by just running one wire and dividing the strands to both of them.
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wonko

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Re: Rewiring wireless headphones, question about ground/negative.
« Reply #1 on: April 21, 2006, 05:53:36 PM »

Well I'm no expert, but I pretty sure L- and R- are not the same.  It takes seperate chanels to reproduce stereo, and most amps (even very small ones in head phones) need their own L and R.  I could be wrong...anyone else have any ideas?
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viridius

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Re: Rewiring wireless headphones, question about ground/negative.
« Reply #2 on: April 21, 2006, 06:45:42 PM »

I've never heard of electrically separate ground connections for speakers.  Reference voltage is pretty sacred in terms of electronics.  They probably just refer to separate pairs of wires going to the drivers.
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urgannagru

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Re: Rewiring wireless headphones, question about ground/negative.
« Reply #3 on: April 21, 2006, 06:48:29 PM »

normally i dont say this about electronics and wiring, but in this case it doesnt hurt to say:
"there's only one way to find out" ;)
underpowering the headphones wont hurt them, overpowering them would. try it with one wire and if it works then great

*disclaimer, im no expert and dont blame me, etc etc...
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damaged

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Re: Rewiring wireless headphones, question about ground/negative.
« Reply #4 on: April 21, 2006, 07:47:02 PM »

I'm no electronics expert, but on wired headphones (stereo) the connection is left, right, ground. The tip being left, the part next to it being right, and the rest being ground. If they didn't require a seperate ground there.. why would wireless ones need it?
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nemattoad

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Re: Rewiring wireless headphones, question about ground/negative.
« Reply #5 on: April 21, 2006, 08:42:12 PM »

Perfect, thanks for the suggestions everybody.

Damaged, that was my line of thinking as well, I think I'll go ahead and give it a try. Viridius, on closer inspection of the traces on the PCB, it seems you are right. My best guess is that the Left - and Right - trace join up at one point. Unfortunately, the exact place that I suspect that they meet is blocked by onboard components and the washer for one of the screws. However, it sure does look like they join up at that point.

I will give it a try later tonight and I will post back with my results.

Btw incase anyone was wondering why I am trying to use one ground wire, it is because I dont have any wire of similiar gauge to what was used with the headphones. I only have lower gauge (thicker) wire, so running two of these thicker wires would not fit, so I must make due with one. Sure I could go and buy some thinner wire, but if I can save a trip to radio shack, and money, I will be happy.
« Last Edit: April 21, 2006, 08:46:44 PM by nemattoad »
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nemattoad

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Re: Rewiring wireless headphones, question about ground/negative.
« Reply #6 on: April 21, 2006, 11:27:08 PM »

 Update:

Wiring worked great by using the same wire for both negatives. Thanks everyone.
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Nate53085

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Re: Rewiring wireless headphones, question about ground/negative.
« Reply #7 on: April 22, 2006, 12:19:28 AM »

I know its all done and working, but why didn't you just slap an ohm meter on it?  Even the cheapest multimeters have connectivity tests. 
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nemattoad

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Re: Rewiring wireless headphones, question about ground/negative.
« Reply #8 on: April 22, 2006, 12:25:35 AM »

I know its all done and working, but why didn't you just slap an ohm meter on it?  Even the cheapest multimeters have connectivity tests. 

Ideally I would have, but I busted one of the leads on mine and I haven't had time to buy replacements.
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