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|17th December 2006, 11:11 PM||#1|
Join Date: Sep 2004
how to isolate input ground?
I need to build a simple opamp based preamp/buffer for an automotive project.
The Buffer is going to be used to interface an MP3 player to a car stereo. the problem is, a ground loop is created when the charger is plugged into the MP3 player as well.
Now the ugly cheap and easy solution is a radio shack ground loop isolator. yuck.
I need to come up with a better solution to do this.
The audio coming out of the MP3 player is unbalanced with a common ground. I have balanced inputs available going into the car stereo, or it can be used unbalanced. The radio shares ground with power, data and audio internally.
I dont have much room inside the case to hang iron and getting small, high quality iron is difficult and costly. so i am looking for some other solution.
Can i simply tie the opamp input neg side to ground through a 100 ohm resistor? Would that be enough to break the ground loop? I thought i had seen that done elsewhere. But wouldnt noise on the ground line then inject noise into the neg side of the opamp?
Help would be greatly appreciated.
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