Would it be simple enough than circuit-mode, or do you need something more along the lines of QuackMode? I highly recommend that you read the Emacs Wiki on the Scheme , as it describes the many options for Schema and Emacs. Honestly, the debugger and stepper will not necessarily be found in Emacs, even if they are present in DrScheme, which is a specific environment. You may need to find a Scheme debugger that you like before you learn how to connect it to Emacs.
All this, I am sure that MIT-Scheme has what you want, because you can start the circuit process from Emacs, in addition, EdWin .