DTMF Decoder - Uses MT8870 DTMF decoder and PIC microcontroller to decode telephone tones. . . .
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 in
the minimize mode and still detect tones while you use your computer to do other things like Net surfing!!!! We
are now in the process of adding an DTMF decoder which will interface to the sound card gameport. . . .
DTMF Decoder with LCD
Display - The DTMF decoder 2 is a useful tool used for
decoding DTMF (Dual Tone Multi frequency) generated by telephones. The decoded digits are viewed on a 16x2 LCD
screen. . . .
DTMF Generation with 3.58 MHz Crystal - Application Note. . . [National Semiconductor]
DTMF Generator/Decoder - . . . [from Boondog web site]
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. . .
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. . . .
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. Hereâ€™s a small and handy tester
circuit for the DTMF IC. . . .
DTMF Tone Decoder - hears touch tones and displays them as telephone numbers. . . [Bob Blick's design]
Dual Tone Multiple Frequency DTMF - App Notefirst published04-Nov-1995. . . [National Semiconductor]
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]
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]
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). The Telephone can
be used to switch. . .
Simulate signals for
telecomm tests - 09/11/99 EDN Design Idea 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 with alternating-mark-inversion (AMI) code. . . [by
Samuel Kerem, Patton Electronics, Gaithersburg, MD]