Simple electric circuit design with MT8880C DTMF transceiver

I need a simple circuit design based on the MT8880. See datasheet and screen shot from datasheet attached. You don't have to worry about micro controller connection, the most important part is this:

The <DTMF Output> should be in such a way, that it can be connected to an android mic input (via headset audio jack) - so the signal needs to be correct impedance and level for mic input. Vice versa the <DTMF Input> should be designed in such a way, that it can be connected to android audio out (via headset audio jack as well).

The circuit can be designed in any way - even a foto of drawing would be acceptable!

Skills: Audio Processing, Electrical Engineering, Electronics

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About the Employer:
( 1 review ) Unterhaching, Germany

Project ID: #19157959

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Hello, I'm just starting out in this field of freelancer, and for this reason the cost offered is the least since I have no references. For your peace of mind iIam an electromechanical and electronic technician, an More

€30 EUR in 1 day
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8 freelancers are bidding on average €133 for this job


Embedded Software is my career and i have 10 year experience as an Embedded SW Engineer to Design a control unit for power wheelchair and i made more projects related to Embed systems. i want to try not for money only More

€250 EUR in 3 days
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Hello I am an Electrical Engineer did MS in Electrical Engineering (Control System) as well. I have 4 years of Experience as well, also have 11 IEEE conference publications and 3 Journals with good impact factor. M More

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I DO NOT OUTSOURCE I have been a freelancer for the past 8 years, I believe that my experience and skill in this background will prove to be of great help to you. Contact me to discuss more on the details

€150 EUR in 3 days
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Hello what i get from your project is that we have to generate tomes and you will give it to this controller to make a digital code. for example one tone at 697 and another tone at 1209 and then the controller detect t More

€155 EUR in 15 days
(1 Review)

Hi, i have the technical skill and knowledge to handle Simple electric circuit design with MT8880C DTMF transceiver perfectly, i have great skills in Power electronics and 8+ yrs of experience in power electronics a More

€30 EUR in 1 day
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We are do all very well. You can see some of our results by this link [login to view URL]

€140 EUR in 10 days
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it is a simple project you need an microphone pre amplifier for matching and increase the impedance from the output of the ic. Simple opamp buffer and then the variable gain preamplifier. See this example [login to view URL] More

€155 EUR in 20 days
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