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eog preamolifir circuit

Link to this post 04 Sep 14

i have uploaded EOG preamplifier circuit. it is from IEEE paper. here i can't understand purpose of mau108. as generally op-amp operates with 12 volt. then in second op-amp why we use 5 volt?

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Link to this post 05 Sep 14


I can able to give full support for Pantech Product but i couldnt give support for your additional circuit. Generally am giving some points.

Usually EOG signal are in milli volt or micro volt or even nano volt, At first stage amplification has more gain so the output may be 12v. Always input of op-amp i greater than the output. At second stage gain was less , so it may sufficient with 5v. MAU108 is DC/DC converter.