Telephone Tone Generator Requires No Trimming
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16 Tone DTMF Generator Keypad 1234567890*#ABCD, 1750Hz tone burst, and CTCSS functionality:Amazon.com:Appstore for Android
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DIY - DTMF Tone Generator and Decoder Circuits
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Taidacent DTMF Decoder/Encoder Full Form Dial Tone Generator Dual Tone Multi-Frequency Audio Decoding Digital Display: Amazon.com: Industrial & Scientific
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Art's Theremin Page: Dial Tone Generator
DTMF Decoder Download - Decode DTMF dial tones found on telephone lines with touch tone phones
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Circuit-Zone.com - Electronic Kits, Electronic Projects, Electronic Schematics, DIY Electronics
DIY - DTMF Tone Generator and Decoder Circuits
