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post #61 of 61 Old 04-12-2012, 06:20 PM
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Originally Posted by A9X-308 View Post

The THAT1200 line receiver opamps make it pretty easy. Designed by Bill Whitlock of Jensen Transformers. I doubt they are used in any domestic audio products though. Just an FYI if you haven't seen them.

Good point. The device you mention has 70 dB CMRR @20 Hz and 65 dB CMRR @ 20 KHz. Furthermore, putting the balancing resistors on the same chip means that they stay matched as the temperature changes, which is iffy with discrete parts.
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