un usual problem ....

Dear sir;
i m doing my final year project, in which i m using eight(8) IR Receiver & one transmitter. All 8 receivers are in sequence. Which out put produces (+5) logic on when it detect IR transmitter LED and vice vesa.
The o/p of all receiver circuit is connected my micro controller port that make a 8 bit pattern. The IR Transmitter Led move one by one on each IR Receiver Led, consequently i m getting a particular 8 bit binary value, and this logic I am using in my project.
This is receiver circuit that I have used .pin 6 is out put and directly connected with microcontroller

My problem is that when I m using single IR Transmitter receiver it is working well .But when I a using 8 receiver circuit on single pcb board with single 5 volt supply there is a problem. And moving ir recever led one by one on each receiver ckt some rec ckt working some one not wrking (what I hv found voltage at inverting pin of 741 not going below 3.26(ref volt at non inverting pin 2).after measurement what I have found-----------------
For single ir transmitter-receiver,
Ref voltage (at pin 3 of IC1 741) =3.26v
Input at at pin 2 (after filtering and amplifying) =3.6 v (above ref. voltage) when IR LED OFF
Receiver IR Led output (at pin 6) = 1.56 v (LED2 OFF)

Ref voltage (at pin 3 of IC1 741) =3.26 volt
Input at at pin 2 (after filtering and amplifying) =3.17 volt(below ref.) when IR LED ON
Receiver IR Led output (at pin 6) >=3.56 volt (LED2 ON)

But when I m using 8 receiver circuit (as given above) not working properly .some one circuit working
And giving out put (3.56v) and some one not working.
What I have found after measurement---
Ref voltage (at pin 3 of IC1 741) =3.26v
Input at at pin 2 (after filtering and amplifying) =3.6 v (above ref. voltage) when IR LED ON
Receiver IR Led output (at pin 6) = 1.56 v (LED2 OFF)

When ir led on , input at pin no 2 of 741 not going below 2.26 (ref voltage at pin 3 which is 3.26). means comparator circuit working fine .
I m unable to find fault where is problem is it in power supply , or op-amp or transistor not amplifying . I have struggling since one week.

this is receiver cikt

Alright so you are basically capturing binary/discrete bits from your IR receiver as far as I can understand.
Are you obligated to use an OP-AMP or can you choose any parts for your project? I'm saying so because there are way much easier approaches to your problem that are as good as the one you proposed -if not better- with less components & more flexibility.
If that's not the case & you're obligated to use your approach then Can you re-post the schematic but along with the values of the resistors, capacitors and the transistor you're using?

The voltage at pin 2 is set by the current through the transistor and R?.
This current is unstable.
It will change due to temperature and small supply voltage variations.

As msakms said, you should consider a different approach.

thanks for reply;
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.