bbg communications history of the mobile phone tech for future
The history of mobile phones traces the development of handheld radio telephone technology from two-way radios appended to vehicles and handheld. It was the 1st system that didn't need any kind of manual control, but was at the heavy side of 40 kilo's. A leaner upgraded version, at 9 kgs was introduced in 1965, called the MTB, which was with transistors and utilized DTMF signaling. It had 150 customers during its initial launch, up to 600 when it shut down in 1983.
From: http://techus.org/2010/07/bbg-communications-history-of-the-mobile-phone/

embedded systems projects list
v) DTMF REMOTE CONTROL SYSTEM w) AUTOMATIC RAILWAY CROSSING GATE CONTROLLER x) HOME SECURITY SYSTEM WITH SENDING MESSAGE ON OUR CELL PHONE y) FASTED FINGER FIRST z) MOBILE CONTROL ELECTRICAL APPLIANCES aa) RF CONTROL ELECTRICAL APPLIANCES dddd) QUALITY FM TRANSMITTER eeee) DIGITAL VOLUME CONTROL ffff) SEC STOP-CLOCK gggg) REMOTE CONTROLLER ED LAND ROVER –A DIY ROBOTIC PROJECT hhhh) DIGITAL WEIGHT ACCUMULATOR iiii) IR- TO- RF CONVERTER jjjj) FM RECEIVER USING CXA
From: http://www.seminarprojects.com/Thread-embedded-systems-projects-list

radio remote control rc using dtmf circuit diagram
Radio Remote Control using DTMF Click here for the circuit diagram Usually remote control circuits make use of infrared light to transmit control signals. Their use is thus
From: http://www.electronic-circuits-diagrams.com/remotecontrolsimages/remotecontrolsckt5.shtml

radio remote control using dtmf circuit
Radio Remote Control using DTMF Circuit. Here is a circuit of a remote control unit which makes use of the radio frequency signals to control various
From: http://www.free-electronic-circuits.com/circuits/radio-remote-control-using-dtmf.html

radio remote control using dtmf by um91214 kt3170 circuit project
Here is a circuit of a remote control unit which makes use of the radio frequency signals to control various electrical appliances. This remote control unit
From: http://www.eleccircuit.com/radio-remote-control-using-dtmf-by-um91214-kt3170/

radio remote control using dtmf circuit
A collection of electronic circuits and projects to build. Here is a circuit of a remote control unit which makes use of the radio frequency signals to control various
From: http://www.free-electronic-circuits.com/circuits/radio-remote-control-using-dtmf.html