- a small pencil lead
- sharpener blade
- safety pin
- some thick copper wire
- Heat the sharpener blade.remember to put a little bit of salt on the blade while heating! the heated parts of the blade's colour will change to blue.
- hold the pencil lead to the safety pin and then wind the copper wire tightly as shown in the third picture.
- do as shown in the last picture.
This is the diode where the soldiers in the olden times used to make their own radio.
Thanks for viewing this instructable.