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Driver Polarity?

post #1 of 5
Thread Starter 

Did something stupid and didn't write down the wire color and where they connected to a pair of headphones I am repairing. Is is a good bet the right side terminal on the driver is positive?

post #2 of 5

If they are MC headphones and you can see the drivers there is a simple  non-technical way to tell  if both drivers are -in phase.

It applies to loudspeakers but MC headphones are technically similar.

Get a low voltage battery and connect the + and - to the input of each earphone check whether the voice coil moves back or forward if forward that usually means the positive is correct .

Both L/R earphones should be -in phase- [the same action for the same +/- battery connection]

Its not hard to tell out of phase it sounds  unfocused and "wooly".
 

post #3 of 5
Quote:
Originally Posted by duncan1 View Post

If they are MC headphones and you can see the drivers there is a simple  non-technical way to tell  if both drivers are -in phase.

It applies to loudspeakers but MC headphones are technically similar.

Get a low voltage battery and connect the + and - to the input of each earphone check whether the voice coil moves back or forward if forward that usually means the positive is correct .

Both L/R earphones should be -in phase- [the same action for the same +/- battery connection]

Its not hard to tell out of phase it sounds  unfocused and "wooly".
 

Thats an old 8ohm  loudspeaker trick I've done it dozens of times over the decades.  Won't it overheat a headphone voice coil though?... its pure DC pinning the driver either in or out...?

 

OP I don't think theres any standard convention right or left.

What headphone did the drivers come out of?  maybe someone here can ID it and tell you.

 

Sometimes the manufacturer has a small ink mark red, green or some other color adjacent to the positive solder pad

post #4 of 5

I don't think a regular 1.5V battery wil kill a headphone. Running 1.5 V trough 10 Ohms will send 200mA and 150 mW through them.

 

 

You have to be sure that you keep the + a + otherwise the driver moves backward. I don't think you want to have all your music sound backwards right?

post #5 of 5

Your right -Holy Cheese. This test can be done in a second all your are looking for is the direction of movement -

Even less than 1 V will do.

You are not going to leave it attached to the headphone-just a quick touch is enough.And wont burn out the voice coil.
 

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