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Gain bandwith product should be considerably higher than intended gain multiplied with 100 kHz. Most OP will do except for slow ones. E. g. a "slow" 741 with 1 MHz GBW would be absolutely limited to a gain below 10 and should be used for a gain not higher than 2 up to 5.
Thanks FvM...
I already calculate using formula before. I'm also trying voltage follower circuit but i will become attenuation when above the audio signal...this I used normal 741..
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