[Brad] over at LucidScience decided that it would be useful to have a DTMF decoder on hand, and got busy building one. His DTMF decoder box uses a CM8870 DTMF decoder chip, which you might assume ...
The project uses a DRA818 VHF/UHF transceiver plugged into a low-pass filter combined with a hardware DTMF decoder ... sheet of transfer paper around the board to align both layers.
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