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kugg / dtmf

Arduino code and board schematics to generate dtmf tones and transmit on a phone line
http://forskningsavd.se
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R2R network/ladder #5

Open kugg opened 14 years ago

kugg commented 14 years ago

To produce nice but slow sine waves look at: http://www.avr-asm-tutorial.net/avr_en/AVR_DAC.html

kugg commented 14 years ago

Its also using sine tables which is well worth considering!