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Old 14th May 2010, 09:33 PM   #1
vzon is offline vzon  United States
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Default Headphones with a TA2020

I was wondering what happens if you hook a pair of headphones to a TA2020 amp such as the Lepai.

Does the amp blow if you connect the grounds from the left and right channels together? Most headphones have the 3 wire plugs with a common ground.

Is there a work around if the grounds can not be hooked tegether? Other than re-wiring the cables on the headphones?
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Old 15th May 2010, 03:32 AM   #2
jcx is online now jcx  United States
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yes you expect the bridged outputs to "fight" each other either current limiiting or blowing up

a way around this would be audio frequency output transformers to turn the bridged drive into (TRS)gnd referenced single ended - a little backwards from usual practice

of course you can get 2 orders of magnitude lower distortion with analog "chip amps" like the TPA6120 into even pretty inefficient headphones - with higher average efficiency too since you'd have much lower quiescient current running the many fewer transistors of the op amp - and no high frequency switching noise to filter out

Last edited by jcx; 15th May 2010 at 03:45 AM.
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