10- Last but not the least join the +Ve of 9V battery with the 6th pin of IC and -Ve of the battery with the 4th pin of IC. Congratulation !!! you ha...
Step 5: GAIN Controller
4-Now join the 1st pin of IC with the A pin of the 5 k ohm variable resistor.
Join th A pin of this variable resistor with the C pin.Lastly join the 8th pin of IC with the B of this variable resistor.This becomes the GAIN.