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how do you make bone induction speakers?

The type that fit behind the ears. My son has hearing issues and the hearing aids don't seem to cut it. He cannot hear the lower frequencies but he seems to respond to vibrations as from quality headphones. I would like to try bone induction with the hearing aids. Thanks in advance.

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unionjack7 years ago
Years ago when beer was a penny a pint I worked on ex RAF radio gear, the throat mike that the pilot used would also work as a speaker if you placed it on a hard surface like a bed headboard or door the whole thing acted like a giant speaker, if you pressed it against your forehead or in front or behind your ear it was amazing to hear sound clear as a bell which nobody else in the room could hear. my late stepfather was extremely deaf and just after the war no one had cash to throw around so I rigged one up to the earphone jack on the wireless and he would sit for hours on end with this little lozenge shaped thing pressed against his temple, he thought it was magic, try it
Hi,

Your story was interesting. I have kind of have the same problem. Could you send a diagram of your hook up. I have only seen the throat radio on the moives. What part of the device was on his forehead... the thoat part that the pilot would press agasint the throat? A family member in need. Thank you Union Jack.
Hi fpatents, sorry for thel ong delay in replying, my isp tiscali were messing with the email accounts supposedly to improve the system, time will tell.
right, back to the throat mike, it only has two wires which terminate into a mono jack plug. it doesn't even matter which wire goes where unless of course your using screened cable then you would use the screen as negative or earth (ground) . there was no battery involved,, it just plugged into the ear phone jack and that was that. I dont know where you could now get these wartime throatmikes, possibly a government surplus store, if you do find a source please let me know. kind regards, unionjack (ex G1 PTB)
You will have to experiment with putting a contact surface on an earphone voice coil. It would probably be better to buy one. My dad used to repair hearing aids and told me once about bone induction. I suspect you will have trouble with low frequencies. Hearing aids are intentionally designed to only amplify frequencies associated with speech. ~Bob~
frollard8 years ago
I always understood the behind-ear induction speakers were cochlear implants, which just transmitted the signal to a coil thru the skin, then the coil was wired to a transducer in the inner ear.