A doubt on interfacing EMG circuit to Arduino?
Because you seem to have an LM741, the most simple solution is just to use 2 inverter configuration:







simulate this circuit &ndash; Schematic created using CircuitLab

For the ADC of your arduino, you should check but the maximum input could be 5V, if it is the case you can raise R2 to 20K and you will get a 2.5 V offset.