Hello all, Sorry to be a pain, But ive just built the two 741 opamp circuit= s, Ive been very carefull with construction, but in getting a lot of noise!= , if I unplug the feed from the coil im getting the data value (in amaseis)= , jumping about 1000 points +&-.=0Aim using two 12v switch mode power suppl= ies.=0A=0A=A0 Im not great at electronics, but I know the basics. =0A=0AIm = using a dataq 194.=0A=A0 Any help would be great!.=0A=A0=A0=A0=A0 Thanks,=Hello all, Sorry= to be a pain, But ive just built the two 741 opamp circuits, Ive been very= carefull with construction, but in getting a lot of noise!, if I unplug th= e feed from the coil im getting the data value (in amaseis), jumping about = 1000 points +&-.im using two 12v switch mode power supplies.=Im not great at electronics, but I know the basics. <= br>Im using a dataq 194.Any help wou= ld be great!.