Sean H. Breheny wrote:

> Thanks for the help on the switches. I think I will use Mike Keitz's
> suggestion (given to me in a private reply), to use a DPDT switch
> (which I think will fit into the hole already drilled in the case).

  You mean like this?


   Counter o-------o____o----o____o-----o Sig Gen
                     .         .
                       .o--+     .o--|Ground
                           |
                           o External

--
  Cheers,
        Paul B.