Effects loop

[jmdfd415]

I am pretty new to building pedals.  I have made 4 pedals so far.  My question is I am wanting to build an effects loop, but I am not sure how to do it.  I have searched and I cant find anything for the one I want to build.  I want one that has loop a switch, loop b switch, both loop a & b, and a master bypass.  Could anyone help me with this?   

[Gilles C]

There was a couple of threads not long ago about this kind of boxes.

Just one question about Loop A & B. Do you want them in parallel or in series?

Gilles