How to unleash the outputs of operational amplifiers are connected to a common load?

Hi, Phil. Disable one of the outputs is very convenient, but in the current development of MUXs difficult to use due to the fact that the board is already divorced and assembled. Mux is useful when there are a lot of free pins I / O of uC, and when there is no continuous signals. I look for a version with minimal modifications of the PCB.

Is it possible to isolate the outputs of operational amplifiers conventional diodes, the more that the output can only be positive?

In developing the new scheme may take note of your valuable comments and suggestions.

Hi, Phil. Disable one of the outputs is very convenient, but in the current development of MUXs difficult to use due to the fact that the board is already divorced and assembled. Mux is useful when there are a lot of free pins I / O of uC, and when there is no continuous signals. I look for a version with minimal modifications of the PCB.

Is it possible to isolate the outputs of operational amplifiers conventional diodes, the more that the output can only be positive?

In developing the new scheme may take note of your valuable comments and suggestions.