Morning,
I got sent the following link from BBC bitesize science .
How to make a loudspeaker .
https://www.bbc.co.uk/bitesize/topics/zw982hv/articles/zg8rxfr
What do you know , it works pretty well. Quite surprising given the amount of vibration the coil must give and voltage being applied from a small headphone socket .
Might be of use to any educators out there.
AP
