Amplify the magnetic field of headphones?

[divdog]

Hey all,

I am trying to amplify the magnetic field produced by headphones. Any idea how I might go about such a thing?

I thought something like a guitar pickup might work if it was more sensitive? Is that essentially what a telecoil is?

Thanks for any thoughts in advance!

Tim

 

[kak111]

You can use device like telephone picup coil for line phones.

**broken link removed**

https://www.circuitstoday.com/wp-content/uploads/2008/08/telephone-pickup-preamplifer-circuit.JPG

Regards KAK

 

[divdog]

Ah yes the telephone suction cups!

What about using an audio induction loop receiver? Like those in hearing aids.

Is it the same kind of field?

 

[kak111]

What about using an audio induction loop receiver? Like those in hearing aids.

Yes, works with same principle.
Pure ac magnetic field generated with wire loop and audio amp.

KAK

 

[FvM]

You should consider, that a standard headphone has an electrodynamical voice coil actuator, that has the magnetical field mostly shielded. Any coil with sufficient number of turns can sense the field.

 

[divdog]

So if I were to make it from scratch I could just wind the thinnest copper wire possible around a the strongest pole magnet as many times as possible and then connect each end to an amplifier circuit as in the link KAK posted above? or do i not need the magnet and I just make a coil?

is there anywhere you can buy such coils?