DTMF INFRARED TRANSMITTER


Posted on Feb 6, 2014

This transmitter uses a 5089 DTMF generator chip and a keypad to generate DTMF signals and modulate them on an IR light beam from an IR LED. Xtal is a 3.579-MHz TV burst crystal..


DTMF INFRARED TRANSMITTER
Click here to download the full size of the above Circuit.




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