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DTMF Decoder - Uses MT8870 DTMF
decoder and PIC microcontroller to
decode telephone tones. |
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DTMF Decoder for PC - Our DTMF
decoder can be powered from a 9V battery
or from your parallel printer port. It
can detect and display all 16 DTMF
digits on your computer screen in
real-time. The Window's program can be
placed |
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DTMF Decoder with LCD Display - The
DTMF decoder 2 is a useful tool used for
decoding DTMF (Dual Tone Multi
frequency) generated by telephones.....
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DTMF Generation with 3.58 MHz Crystal
- National Semiconductor Application
Note |
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DTMF Generator/Decoder |
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DTMF Products for you - DTMF
decoder can be powered from a 9V battery
or from your parallel printer, schematic
and windows demo program, design by
Schmidt Technologies |
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DTMF Proximity Detector |
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DTMF Radio Remote Control - 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
has 4 channels which can be easily
extended to 12. .... |
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DTMF RECEIVER - Today, most telephone equipment use
a DTMF receiver IC. One common DTMF receiver IC is the
Motorola MT8870 that is widely used in electronic
communications circuits. The MT8870 is an 18-pin IC. It
is used in telephones and a variety of other
applications. When a proper output is not obtained in
projects using this IC, engineers or technicians need to
test this IC separately. A quick testing of this IC
could save a lot of time in research labs and
manufacturing industries of communication instruments. |
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DTMF Tone Decoder - hears touch tones and displays
them as telephone numbers...... |
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Dual Tone Multiple Frequency DTMF - National
Semiconductor Application Notes first
published04-Nov-1995 |
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Full-duplex doorphone with 3 Wires connection - a
two-way (full-duplex) construction planned for use as
doorphone…. [Peter Jakab, Electrical Engineer, Engineer
of Informatics] |
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Radio Remote Control using DTMF - 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 has 4 channels
which can be easily extended to 12. This circuit
differs from similar circuits in view of its simplicity
and a totally different concept of generating the
control signals..... [Radioland.net] |
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Remote control using telephone - Here is a tele-remote
circuit which enables switching "on" and "off" of
appliances through Telephone lines. The circuit
described here can be used to switch up to nine
appliances (corresponding to the digits1 through 9 of
DTMF the Telephone key-pad). |
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Simulate signals for telecomm tests - 9/11/98 EDN-Design
Ideas.....The circuit in Figure 1 is a miniature gadget
that is helpful in telecommunication applications. The
function of the device is to simulate data flow with
predefined patterns and use these patterns to check a
cable's or a receiver's functionality. The circuit
generates a signal in accordance.....File has several
circuits, please scroll to find this one..... [Design
Idea by Samuel Kerem, Patton Electronics, Gaithersburg,
MD] |
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AN-521: Dual Tone Multiple Frequency DTMF -
National Semiconductor Application Note |
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AN-666: DTMF Generation with 3.58 MHz Crystal -
National Semiconductor Application Note |
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Device Control using DTMF - Controlling devices
using switches are common. From a few decades
controlling devices using remote control switches like
infrared remote control switch, wireless remote control
switches, light activated switches are becoming popular.
But these technologies have their own limitations. Laser
beams are harmful to mankind. …..... |
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DTMF Coder Makes Low Cost Sine Wave Generator -
10/13/94 EDN-Design Ideas.....A telephone DTMF IC
produces, by design, two tones if you connect a single
intersection of the IC's 4[x]4 keypad matrix (Fig
1]..... EDN is migrating links. This link is not
verified. Search the "title" + "EDN" for new link.
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