The CMD CM provides full DTMF receiver capabil- ity by integrating both the bandsplit filter and digital decoder functions into a single pin DIP, SOIC. CMOS Integrated DTMF Receiver/Decoder The CMPI provides full DTMF receiver capability by integrating both the bandsplit filter and digital decoder. Buy low price, high quality dtmf decoder ic with worldwide shipping on 20pcs/ lot CMPI CM DIP IC DTMF Telephone decoder chip New Original Free .
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Qty 5 CMPI CMOS Integrated DTMF Receiver Pin DIP | eBay
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Troubleshooting CM8870 DTMF Decoder Circuit
Blogger Templates Created by ThemeXpose. Rest of the connection for single ended input connection can be found on the datasheet itself. Input frequency required is giving through the audio jack of the cellphone. The audio cable has 3 wires- ground, left and mc8870pi in mobile earphones 4th wire is for mic.
Use any one of decoddr channel and the ground decodr input to the IC. The output is latched to Q1, Q2, Q3 and Q4 pins. In this project output is directly taken from Q1 cm8870pii implies that it will turn on for all odd numbers and turn of for all even numbers pressed. The output is given to the base of the transistor configured in switching mode to turn the relay on and off.
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