Hi,

Tone Generator and Tone Decoder Integrated Circuits.

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The XR2206 and XR2211 are a versatile pair when it comes to modem building.
Their advantage is that they may be set to what ever Mark and Space tones
you like, creating the tone shift desired.


Example of aplication:

http://www.klm-tech.com/technicothica/xr.html


Manufacturer:

Exar Corporation,
Fremont California,
U.S.A.
http://www.exar.com


Where to buy:

http://www.jameco.com

XR2211 IC = Jameco #: 34999 USD 1.79
XR2206 IC = Jameco #: 34972 USD 3.59


Best regards,

Luciano