Updated : Jul 16, 2020 in Education


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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Find here the answers to all the electrical engineering related doubts you have!!

We are a bunch of enthusiastic bloggers who love dcoder pen down stuffs we learn in our engineering life.

It a platform for us to share our knowledge and hobbies and interact with like minded people. Contents mainly covers electrical and electronics domains, our training experiences, core concepts, small hobby and simulation based projects and updates about latest technologies.

I’ve always been curious about cellphone controlled electronics in the home. It would be most convenient with my disability to be able to turn the smoke alarm off if I accidentally smoke out the kitchen.


I am way too short for waving a towel at the smoke alarm.

Troubleshooting CM8870 DTMF Decoder Circuit

So nice, you can also choose some from Wosports: Dmf enjoyed reading your work. I’ll come back for more Keep up the good work: This blogs is awesome.

I enjoyed reading your work and this blog is very helpful for me. Just like relationship between peoples, home appliances also play an important role in human life. Heating and Cooling Toronto.

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Rest of the connection for single ended input connection can vecoder 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 right in mobile earphones 4th wire is for mic. Use any one of the channel and the ground for input to deecoder IC.

DTMF based cellphone controlled home appliances | Common Electrical Doubts

The output is latched to Q1, Q2, Q3 and Q4 pins. In this project output is directly taken from Q1 which 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. Neha Decider 20 July at Trical Doubts 23 October at Steve Berke 28 December at Yoohomz 3 April at Chandra Shekhar Joshi 26 April at Unknown 9 October at VNIT 11kV indoor substation.


Power cuts are rare a Potier triangle method is helpful in obtaining the voltage regulation of synchronous machines.

It gives the value of potier reactance How restless we grow when there is a power cut in summer nights especially when we are a Working of Analog Clock Importance of time keeping is recognized ever since the life came into existence.

From just days and ni Like us on Facebook Common Electrical Doubts.

Training Report on Bokaro Steel Plant.