offset null in op-amp

hello sir;
now i have removed this problem .now my problem that i m doing a test using switch.
when i m connecting a switch to controller , the controller is working means stepper is moving forward and reverse according to switch ON and OFF. But when i am connecting out put of above circuit which i have post above (means out pin 6 of op-amp) it not detecting switching and moving only one direction.
the out put voltage at pin 6 of is 1.46 even no signal receiving by IR LED(Receiver Led) from the transmitter Led.is problem this ,means at logic zero voltage is 1.46 .
how i can remove this voltage to zero. please help me.

which circuit are you talkin about?

sir,
i have post the problem in(project doubt section with topic "unusual problem"). i have also used TLO84 and OP07 but it has also the same problem output=1.47 even no signal received by receiver.
actually i have replaced eight 741 ic with two LM 324.
complete problem is in topic "unusual problem" posted by me . now i find that this is "USUAL PROBLEM ".

sorry sir,
i think by mistake i have used my friend yash account to reply ,we are class mate. i was on his laptop.

You need to post a diagram here of your latest setup.