Thanks for the reply. I indeed forgot to include the values. the IC is the strain gauge amplifier and the circuit around is for reducing noise, drift etc and also to adjust the bridge initially to zero for bridge imbalance but the latter function is not working (or maybe i am not able to do it). The component values are as followed. Please advise me on how to eliminate the imbalance since this is not allowing me to move further in my work.
R1, R3=100k
R2, R6=100R
R4=68R
R5,R8=10R
R7=47R
R9=1K
T1:BD135
T2:BD136
T3:BC108
C2,C5:10nF
C3,C4:10uF
C1,C6,C7:100nF
D1,D2:1N823