The main parts will be:

- Ring Modulator

- 555 pulse generator

- Microphone amp

If I can work it into the project in time:

- A color/light organ (because the Cybermen and Daleks both have a part that lights up when they speak)

The plan for this project is to keep it as low budget as I can.  (For those makers out there that, like me, do the best they can with what little they have).