This is how to make crystal radio part two. This video explain how to assemble a crystal radio in ten minutes. This radio utilizes a different material from different manufacture. This radio use the internal part of radio. Then it is connected to the tuning coil. This part is build from the coil and ferrite and also tuner.
The antenna is connected into the coil then connect the capacitor. Then the electron processed to the earphone crystal. We need to draw away the ferrite or other stuff that can disturb the signal so that we need a grounding wire.