Ej-3 Loud-speaker


To demonstrate the principles of a loudspeaker


  • Coat hanger wire frame
  • Support cardboard
  • Wire wound
  • PA amplifier
  • Light globe load
  • Radio
  • Neodymium Boron Magnet

Loud Speaker

Loud Speaker Setup.


A wire coil of about 100 turns is tightly wound on a cardboard tube former. This is attached to a cardboard cone which will act as our diaphragm. The output of a small radio receiver is used to drive a PA amplifier, a light globe is used in series with the coil to act as a suitable load. When a strong magnet is brought close to the coil a reasonable rendition of the radio signal ensues.