I have constructed a dual op-amp using two LME 49990. Now only the V+ and V- comes to the pins of the chip. None of the pins have ground. This is the case even for traditional dual op-amp like OPA 2134. However decoupling is easier for a dual channel op-amp as the op amp will be soldered on the main board itself and it wouldn't be too difficult to provide placement for decoupling caps on the board itself.
Now for constructing a dual op-amp from single channel op-amp like 49990, I have used a separate PCB with LME 49990 soldered on the top and bottom. I have replaced the original op-amp with this board. However, I think there is some oscillation as the chips are running hot. Since there is no ground, what is the technique for connecting two decouping 100 nf caps (v+ to ground and v- to ground)?
Now for constructing a dual op-amp from single channel op-amp like 49990, I have used a separate PCB with LME 49990 soldered on the top and bottom. I have replaced the original op-amp with this board. However, I think there is some oscillation as the chips are running hot. Since there is no ground, what is the technique for connecting two decouping 100 nf caps (v+ to ground and v- to ground)?