Not sure which end of what magnet is which? Want to amaze your friends with your magnetic knowledge? Want to provide a simple yet dramatic demonstration of semiconductor behavior? Or maybe your just looking for a unique and fun device. Might we suggest our Magnetic North Pole Detector developed by a working teacher? -- Turn it on and the green LED lights up. Bring a magnet next to the LED end of the detector and if the magnet is oriented with its north pole touching the white mark, the LED will go out. -- If it is the opposite pole that is pointing toward the device, the LED will be unaffected. The detector employs a Hall Effect semiconductor that responds to a magnetic field by increasing its output voltage when one pole is brought nearby and reducing its output when the opposite pole is introduced. |
