wireless headset

[wgaurav]

hi
i m new to this forum.i m in final yr engineering ,extc.i m planning to make wireless headset for telephone(land line) ,as my project. can anybody plz provide me with information abt the product,ckt diagrams.....
any info is valuable
any suggestion is welcome


cheers
gaurav

[webmaster]

On interfacing to the handset interface of the phone, those links could be useful:

Headset-Adapter for Cisco-IP-Phone
http://www.mml.uni-hannover.de/einhorn/ ... dex_e.html

Code: Select all

Western-Jack     1     2    3     4
Color (e.g.)     black red  green yellow
Signal           SPK+  MIC- MIC+  SPK-
Speaker jack     L+R              ground
Microphone jack       ground L+R   


pinout for"standard"telephoneheadsetrequired.?
http://lists.digium.com/pipermail/aster ... 00099.html

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RJ10 -- 2.5mm
  1       3      speaker ground
  2       1      mic
  3       3      mic ground
  4       2      speaker


In addition to those you need some wireless radio links for the audio. Those can beascally work at wahtever frequency band you are allowed to use. You need one bdirectional link that can transport audio to both directions, or two unidirectional links (one for telephone to headset direction, one for headset mic to telephone) operationg at different frequencies (can ba channes some distance aways from each other on some band or at completely different band).
The radio links should be able to pass the telephone frequencies (300 Hz to 3400 Hz) at reasonable quality..

Depending the application needs those can be anything in the following line:
- some existing wireless headset product maybe made for some other application originally (as long as it has mic and speaker connections)
- small FM transmitter circuits (1-2 transistors) + normal FM radio on the receiving end
- walkie-talkie radios
- wireless audio links (wireless monitoring systems, wireless "hifi" audio links, wireless microphone products etc..)

[Tomi Engdahl]

It seems that thos4 4 pin conenctors cna have somewhat different pinouts depending on use:

Here is the pinout for the headset jack at the Cisco phone (the image shows the view upon the jack):

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1    2    3    4
SPK+ MIC- MIC+ SPK -


Pinout of the handset jack at the Cisco phone (the image shows the view upon the jack):

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1    2    3    4
MIC- SPK- SPK+ MIC +


Images and information are from http://www.mml.uni-hannover.de/einhorn/ ... dex_e.html

[Guest]

I have the product similar to what you are just described. It's the cellular headset adapter for a Cisco IP phones. It allows to use any standard cell phone headsets with the 2.5mm plug. And as a special case you can use a Bluetooth headset (you will need to get a Bluetooth adapter for non-bluetooth phones). I have US patent pending for this adapter.

As a special orders I can make an adapters for Nokia headsets, headset adapters for conventional phones (to use instead of standard handset). All adapters are commercially manufactured and 100% tested. Check my website:

http://www.ciscoheadsetadapter.com

[headsetadapter.com]

I have a new product - headset adapter for a standard phone. Now you can replace your handset with a standard cellular headset. Works with any phone.

Headset Adapter for a standard phone

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