Ej-3 Loud-speaker
Aim
To demonstrate the principles of a loudspeaker
Apparatus
- Coat hanger wire frame
- Support cardboard
- Wire wound
- PA amplifier
- Light globe load
- Radio
- Neodymium Boron Magnet
Loud Speaker Setup.
Description
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.