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Page history last edited by PBworks 13 years, 4 months ago
  1. Why does this device work?

This device currently doesn't work. However it is supose to work byThe tunable filter consists of the coil and the dial (with the external antenna

The rectifier consists of the razor

blade and the safety pin

The filter action is achieved with

the external earpiece.


  1. What does it demonstrate about electricity?
  2. What have you done to improve the design of the device?
  3. What advice can you offer to future builders of the device?
  4. Who invented the device? when? why?
  5. What are some things you have learned about electricity from doing this project?

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