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PhonePhreakrz: DTMF Decoder 2

Posted September 17, 2011 by Chris

“The DTMF decoder 2 is a useful tool used for decoding DTMF (Dual Tone Multi frequency) generated by telephones. The decoded digits are viewed on a 16×2 LCD screen. The DTMF decoder can be directly connected to a Serial port to view the digits in HyperTerminal on a computer.”

2 Responses to “PhonePhreakrz: DTMF Decoder 2”

  1. slink Says:

    I’ve tried looking for the MT8870DE at the site listed in the article and I also looked at Digi-Key, Jameco, Mouser, and Newark. Unless anyone can recommend another source it would appear that you can’t build this project due to a critical component being obsolete.

  2. Chris Says:

    Check here:

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