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Touch Dial Tone DTMF Decoder Circuit

2017-08-16 15:37  
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DTMF Decoder is a very easy to use program to decode DTMF dial tones found on telephone lines with touch tone phones.DTMF Decoder is also used for receiving data transmissions over the air in amateur radio frequency bands.This decoder will respond to a preselected 4-digit DTMF number. IC7  is a Radio Shack IC device (part #276-1303). The logic is all CMOS. The digits are selected by SW1 and SW2, a pair of 8-position  DIP  switches.Now you can use touch-tones to control virtually anything via radio,phone line or even tape. The kit is backed up by powerful 20mA output lines that can be set up to control nearly anything that you can think of.
 

Low-Power Touch-Tone Decoder