Inductive coupling detector

[neko_whisker]

Any idea how to build it? I used to put my cellphone into the box where it's sensor can feel vibration upon the incoming sms as I am deaf and I don't like to carry it in my pocket around in my home. Now I would like to change as I have seen flash sticker and all cellphones come in different shapes.

I would like to design the inductive coupling detector circuit such that I can place my cell phone next to the detector that can give visual alert.

I tried searching for simple inductive coupling circuit for tutorial in internet and experiment before I improve it, but cannot find it.

Cell phones carries radio waves so I think it might induce current into detector just like flash sticker. I think so

 

[johankj]

Maybe you can use one of those little key-chains that light up when the phone rings?

 

[johankj]

**broken link removed**

 

[ronsimpson]

https://www.phonelabs.com/prd05.asp
The Dock-N-Talk charges cell battery. I plugged the Dock-N-Talk into the house phone wiring. Now when the cell rings, all the phones in the house ring. It will drive a “flashing light” or “vibrator” used by the deaf.

I know this is not exactly what you want but it will allow you to use any phone accessory even the ones used by the deaf.

 

[Super_voip]

Every time the cell phone communicates with the base station, a keep alive signal, it would flash. The dock-n-talk sounds good or you could connect it to a computer, you don't say what phone model you have, then you could send and receive SMS from the computer.

 

[Sceadwian]

Any large inductor placed near the speaker will pick up the signal from a speaker which you can process any way you want. I did some playing around using a spare spool of 10BT wire and could pick up the sound the speaker was makeing simply from it's inductive coupling at a good 12 inches away, a smaller very fine wire inductor could probably pick up speaker signals within a few inches of the phone's speaker. How you procsess them is up to you.