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ctcss tone decoder sample program
hello, the project over a long time trying ctcss tone decoder. i made a filter that integrates with the tl082 and the tone frequency of 88.5 hz as in the diagram below i entered 16f628a processor. my goal is to tone comes from the processor to receiv...
RF, Microwave, Antennas and Optics :: 20 Oct 2009 8:05 :: sozkarabacak :: Replies: 0 :: Views: 120
a doubt in dtmf decoder-problem
hello, i am working on a dtmf encoder-decoder. i am decoding according to the steps given by my proffesor. for decoding i am supposed to follow these steps:1. dtmf_signal i.e the tone and the sample frequency fs as input.2. fourier transform it usi...
Digital Signal Processing :: 06 Oct 2009 18:26 :: swetha.incore :: Replies: 0 :: Views: 123
proteus dtmf encoder unit if you need it grab a copy
here is a data to dtmf tones dialer unit {not a decoder !!!}allows for several timing modes and full tones adjustment to reuse for other systems also can be reused as a submodel if you want to add other control logic and decoders as a unit submodel e...
Software Downloads/Uploads :: 16 Sep 2009 16:51 :: VSMVDD :: Replies: 0 :: Views: 360
debugging tone decoder(567) for fsk demod..help needed
i have been using lmc567 foe fsk demodulation.is it feasible enough.an fsk modulated wave is applied to pin 3 as i/p. r and c are selected to the freq. value which is the same value of the freq. of the modulated signal when the digital precedor(count...
Analog Circuit Design :: 18 Aug 2009 18:28 :: akshay_d_2006 :: Replies: 0 :: Views: 204
frequency controlled valve
hi there i want to turn on solenoid valves depending on frequencyi am thinking of f to v converter so that i use a comparator to turn on the wanted valve.i bought the lm2907 but the schematic is confusing will the circuit of page 16 work?thx...
Hobby Circuits and Small Projects Problems :: 17 Aug 2009 17:22 :: pakitos :: Replies: 6 :: Views: 568
what is the concept auto scan frequency in mobile?
mean how does the auto scaning fequency in mobile stops to scan when it catches the freq. signal which is strong enough. what is the concept behind it...?can similar concept could be used to detect a tone (test tone or any normal speech tone) by manu...
Analog Circuit Design :: 03 Aug 2009 16:04 :: akshay_d_2006 :: Replies: 2 :: Views: 228
detecting that caller is on line or disconnected (telephone)
hi everybodyim just trying to make an answering machine that works on telephone line. but i have a problom. i cant detect that the caller is disconnected or is still online. when the caller is disconnected, the answering machine should disconnect fro...
Analog Circuit Design :: 27 Jul 2009 17:04 :: pranam77 :: Replies: 8 :: Views: 336
help with getting lmc567 to detect tone
im hoping someone can shed some light on why this isnt working for me. at first i tried using two lmc567 chips that were both using the same value resistors and capacitors so theyd be at the same frequency (~2khz). i then fed the output (pin 5) of ...
Hobby Circuits and Small Projects Problems :: 11 Jul 2009 8:32 :: FvM :: Replies: 3 :: Views: 318
help with designing wireless switch
hey everyone,ive searched around the internet for what im trying to do and im hoping someone here can help me. what im trying to design is a wireless switch. close a switch at point a and that causes a switch at point b to close - this being used a...
RF, Microwave, Antennas and Optics :: 08 Jul 2009 10:32 :: kevin360 :: Replies: 2 :: Views: 222
433 mhz rec and transmit problem
dear friends.i m doing a project on transmitting a temperature data ( in the form of voltage)through readily available tx and rx. modules of 433mhz. pair.my question is -- is the encoder and decoder chips are must at both the ends of rx and tx ..?w...
RF, Microwave, Antennas and Optics :: 12 May 2009 12:46 :: vfone :: Replies: 2 :: Views: 387
how to interface mt8870 with sim300c gsm modem
llo forum, i have been trying to work with the sim300c gsm modem and finally i have done and it is really great to learn from this great forum. i have finalized everything but i can not read the dtmf tone from the gsm modem. my decoder circuit with m...
Electronic Elementary Questions :: 08 May 2009 20:47 :: phaedrus :: Replies: 1 :: Views: 690
dtmf based robotic project
t in which i have to control 3 servo motors and 2 dc motors on a mobile platform. it needs to be controlled in two modes. one is using a mobile phone on the robot which receives commands through dtmf tones from another mobile phone. the second one is...
Microcontrollers :: 30 Apr 2009 14:49 :: Noman Yousaf :: Replies: 8 :: Views: 1392
how do i measure 2 seperate audio signals on one line?
i need to measure an audio signal on one line. the only problem is that it has two audio frequencies on the one line one at 2670hz and the other at 1440hz. i obviously cannot just measure it with an o-scope. so my question is there a piece of test...
Electronic Elementary Questions :: 13 Apr 2009 15:00 :: vistapoint :: Replies: 6 :: Views: 273
what is this chip?
hii have a chip which is labelled asim340bb75558r0810xi have spent sometime trying to find the datasheet but no success. any ideas?many thanks...
Hobby Circuits and Small Projects Problems :: 09 Apr 2009 8:38 :: galza :: Replies: 9 :: Views: 1341
audio application using pic??? clueless
hey guys, im kinda new at this, im trying to program a 16f877a pic microcontroller to recognize specific audio frequencies at certain time intervals - for example, 300hz at 0 sec, 545hz at 2 sec, 1231hz at 5 sec, 300hz at 7 sec and the loop goes on.....
Microcontrollers :: 30 Mar 2009 18:17 :: FvM :: Replies: 14 :: Views: 639
how to get the dial number from gsm module
i am engaged in a remote controll system, which get the instruction from the dial number. for example: a dials b, and b picks the phone, then a dials 1, how can b get the 1 ? is there an at instruction to get the number information from the gsm modul...
Network :: 05 Nov 2008 5:21 :: raychenchina :: Replies: 2 :: Views: 318
spice model for 4046 + lm567 needed
does anyone have an orcad spice model for pll (4046) and or (lm567) tone decoder.thanks in advance...
PCB Routing & Schematic Layout software & Simulation :: 11 Sep 2008 9:44 :: keen :: Replies: 3 :: Views: 4237
single frequency detectors
hii want a circuit that will detect wheter the incomming signal is a given frequency say 1khz. it has to give a logic high for a 1khz signal and a logic low for all other signals.any ideas ??what are these circuits known as ?...
Hobby Circuits and Small Projects Problems :: 03 Jul 2008 10:16 :: viperpaki007 :: Replies: 7 :: Views: 429
dtmf remote telephone switch
hi all,ive an application wherein i have to control remote home appliances using a dtmf remote telephone switch.once a telephone connection is in place,a transmitted tone can be used in order to trigger a desired action.this technique,well known fro...
Microcontrollers :: 29 May 2008 23:06 :: engaydi :: Replies: 11 :: Views: 3126
300 points for good idea
hi friends, i am doing a project wireless text messaging using mobile/landline phonesoftware:the msg.asm program is written in assembly language and compiled using metalink asm51 cross-compiler.hardware:1. there are 2 mobiles used one at the transmit...
Microcontrollers :: 03 May 2008 8:38 :: zuisti :: Replies: 4 :: Views: 1065
i want to build a telephone dialer with only mcu
i want to build a telephone dialer with only mcu.without a dtmf decoder or encoder.do you have a any schematic?thx...
Microcontrollers :: 22 Apr 2008 16:25 :: engaydi :: Replies: 18 :: Views: 1686
auto dialer for security system project help
hello everyone,im new here! and i need help , can anyone help me in how can i interface mt8888c chip with any microcontroller ( i prefer pic) ? any thing useful ( like codes for example or documents) plzzzzz help...
Microcontrollers :: 26 Feb 2008 20:45 :: laktronics :: Replies: 7 :: Views: 498
interactive voice response systems
hello ,i hope this is the right forum in the board to post this query.i would be designing an interactive voice response (ivr) system using the sim gsm modem.the system will pick up the phone at the third ring and give a voice message out :press 1 fo...
Microcontrollers :: 03 Jan 2008 6:47 :: umery2k75 :: Replies: 15 :: Views: 872
to detect tones dtmf with terminal gsm (tc65)
hello, everyone i have a pic that it is connected in a terminal tc65 of the siemens, and then i ask: exists the possibility of this terminal to detect originated tones dtmf, for example, of a cell phone, so that the pic can interpret them?...
Microcontrollers :: 19 Dec 2007 1:27 :: tictac :: Replies: 2 :: Views: 270
tone decoder
hi,what i know about tone decoder is that its used in sensing and detecting frequency.can anybody widen my view on this topic.thanks in advance....
Digital communication :: 04 Dec 2007 6:31 :: marsloner :: Replies: 4 :: Views: 321
using lm567 to detected frequency in line of power
ncy over line of power [220 v, 50 hz]and i will detected one of them by using lm567 or ne567 or ka567after isolated power signal [220 v , 50 hz]but i dont passed from this stage(i need application of tone decoder lm567 ...)please help me !!!!!!smart2...
Analog IC Design & Layout :: 27 Nov 2007 11:53 :: Smart2007 :: Replies: 0 :: Views: 162
dtmf receive???
how receive dtmf tone from mobile phone? i need it for remote controle. could i use data cable to read send number from another phone with at command and hyperterminal? thanks, kima...
Microcontrollers :: 05 Oct 2007 17:39 :: blacksector :: Replies: 11 :: Views: 3414
sound/tone decoder
stion :).i have a buzzer that emits many different sounds and, also, 3 error codes:1°) bip bip bip at 440hz2°) biiip biiip biip at 700hz3°) biiiip biiip biiiip at 1150hzi want to decode these 3 error tones.i cant touch nothing (the buzzer, the amp) t...
Microcontrollers :: 19 Sep 2007 4:12 :: faraz101 :: Replies: 7 :: Views: 357
need help in....mobile phone based voice interactive system.
im currently working on voice interactive system ..........im using cell phne at reciving end. can any body tell me how do i detect which key pressed from the dialing end ?do i use at cmmands or dtmf tone decoder ic ??? thx....
Microcontrollers :: 07 Sep 2007 17:32 :: drbizzarow :: Replies: 2 :: Views: 168
how to send digital data via vhf fm transmitter?
haii have to send digital data (a gps string ) from one point to another through vhf transmition. how to do that ?i have mic input of a vhf transceiver (144mhz fm) at one end and a receiver at other side?dtmf or modem ? how ? suggessions pleasepicstu...
Microcontrollers :: 14 May 2007 11:40 :: zahidkhan :: Replies: 11 :: Views: 1449
where can i find code in visual basic to decode dtmf signals
i want to develop a vb application to decode the dtmf signals received via soundcard. where can i find the explanation/help/code for the same?...
Digital Signal Processing :: 09 Apr 2007 17:30 :: Prashantskin :: Replies: 4 :: Views: 363
speech codec info
hey guyzi want etsi papers for gsm speech codecthanx...
Digital communication :: 25 Mar 2007 0:29 :: Yasser A.Nour :: Replies: 4 :: Views: 540
rc filters
hi, i need help with a design a a single tone decoder. i must supress the low voltage cause this is a cuadratic signal and i need to make it totally positive. i wish you culd help me....
Analog Circuit Design :: 02 Feb 2007 4:00 :: Zocratez :: Replies: 0 :: Views: 78
567 decoder macromodel needed
does anyone know of a source for a macromodel for electronics workbench for a lm 567 tone decoder ic?...
Electromagnetic Design and Simulation :: 03 Jan 2007 18:38 :: johnsong :: Replies: 0 :: Views: 129
dtmf using delphi
need help in generate dtmf tone with delphi? a vcl (freeware) or guidance is a great help :dthank you...
PC Programming and Interfacing :: 29 Aug 2006 15:34 :: newelltech :: Replies: 5 :: Views: 714
how can i operate appliances using my telephone
i have little idea this can be done using dtmf deocder ic and controller.but i am stuck how to connect phone line with that ic do i need some precautions or what. i need little help to ignite my self in this topic reset i can burn my self....
Hobby Circuits and Small Projects Problems :: 26 Aug 2006 18:19 :: MNabil.cee :: Replies: 2 :: Views: 240
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help: service manual philips receiver fr951
im searching now for several months for the service documentation of my receiver. i would like to repair him but for me that is impossible without having a good document as a gide line. i hope someone can help me.philips receiver fr951 or typenumber ...
Service Manuals, Requests, Repair Tips :: 05 Jun 2006 14:14 :: Joseph62 :: Replies: 3 :: Views: 1926
dtmf decoder using microcontrollers?!
does anybody have an idea how to make a microcontroller (pic, atmel..) decode dtmf signals without the use of an external decoding chip?can u help?...
Microcontrollers :: 03 Jun 2006 10:25 :: apk_1010 :: Replies: 36 :: Views: 2844
8870 dtmf decoder problem!
hai i am using 8870to decode a dtmf tone from a telephone line. but the decoder always out a different value.for 2 it outs 3for 4 it outs 5 that means the lsb of the data line always come as 1. i checked the line for any short or anyth...
Microcontrollers :: 30 Mar 2006 23:21 :: wdgwdg :: Replies: 6 :: Views: 2322
dtmf decoder in matlab
i need the matlab implementation of dtmf decoder, please email me if some1 has it. my email is farhan.iqbal@gmail.comthanks in advance...
Digital Signal Processing :: 21 Feb 2006 3:37 :: rastafier :: Replies: 9 :: Views: 2016
how to detect the "busy nois"
hi.can you help me to detect the busy nois in phone line with picthanks...
Microcontrollers :: 17 Jan 2006 18:20 :: artem :: Replies: 3 :: Views: 228
ctcss subaudio encoder decoder needed
i search schematich without specialistic ic (ie cml) for encoding and decoding radio transceiver subaudio tone ctcss...
Hobby Circuits and Small Projects Problems :: 16 Nov 2005 18:04 :: koky :: Replies: 0 :: Views: 207
encoder/decoder
hi all,i generated a tone of 4.8khz using 555 and lm567 as adecoder it locks but icannot get it to clock cd4013 in toggle configuration.can someone help please.second question is what is the value of this coloured trimmer capacitors (a) yellow ...
Hobby Circuits and Small Projects Problems :: 16 Nov 2005 16:09 :: throwaway18 :: Replies: 1 :: Views: 330
infrared signal encoding
my ir transmitter transmit a burst of oscillation at a certain frequency to represent a 1 and a burst of osc. at a different frequency to represent a 0.what are some ways i can program my at90s2313 mcu to recognize the bursts to recognize the 1s and...
Hobby Circuits and Small Projects Problems :: 10 Oct 2005 12:26 :: throwaway18 :: Replies: 1 :: Views: 312
student level dsp project
hi im a engg. student.could you kindly suggest some student level dsp projectsthanking you...
Digital Signal Processing :: 03 Sep 2005 0:30 :: glenjoy :: Replies: 2 :: Views: 303
where is the frequecy of dtmf telephone??
i tried to measure the frequency of corresponding number pressed in dialpad of dtmf telephone by tapping the wire....but i couldnt get the frequecies while pressing..only displays 0hz...what happened...how can i measure frequecies...? do i have to op...
Hobby Circuits and Small Projects Problems :: 23 Aug 2005 5:22 :: platonas :: Replies: 6 :: Views: 420
detection of remote pick-up on phone lines
how can i detect remote side picked up the phone when im calling?...
Analog Circuit Design :: 22 Aug 2005 8:07 :: rogerliu :: Replies: 1 :: Views: 144
ringback tone detection
dear all ...is there some simple ic (not a dsp) for the detection of the ringback tone on telephone lines? ive searched the web without success.any hint will be appreciated.thanksegeorgiev...
Other Design :: 08 Jul 2005 10:53 :: aasheesh_sharma_11 :: Replies: 7 :: Views: 2252
simple remote control
hi, i ask any buddy have circuits of simple remote control to use in home application .pls reply...
Electronic Elementary Questions :: 27 Jun 2005 8:26 :: hermin :: Replies: 8 :: Views: 948
house alarm systems and the fixed phone line
hello, some of the alarm systems use a phone interface to the main center, so in the case of an alarm event the system can notify the company which provides the service of guarding the object. i am interested if the phone interface inside of sy...
Professional Hardware and Electronics Design :: 16 May 2005 6:36 :: najam696 :: Replies: 28 :: Views: 7666
i want to make the communication by phone line
hi alli want to send and recieve the data by telephone lineit will be the digital datain other words i want to make a modam.it should not be micro controller based.i just want to send serial data and want to get from the other end.data is not too spe...
Microcontrollers :: 24 Mar 2005 17:20 :: SARCO :: Replies: 7 :: Views: 996
using dtmf to transfer data through pstn
hi, i want to use dtmf to transfer data on telephone line but i donot known what data rate i can acheive...
Embedded Systems and Real-Time OS :: 18 Jun 2004 11:16 :: padspcb :: Replies: 4 :: Views: 765
pic to pic log distance (4-5km) modem chip
hi,i need to interface the usart interface of 2 pic (877) trought a tone generator/decoder, using a twisted couple. what is the best chip, and the best way to do it ?.tnx!...
Microcontrollers :: 05 May 2004 21:18 :: Mago-Anthony :: Replies: 3 :: Views: 405
receiver circuit
hi i have built an ultrasonic transmitter (using 40khz & 555).im trying to build an ultrasonic receiver circuit and have the output displayed on 7 segs or led displays.what would steps would i need to take to build it.thanks...
Hobby Circuits and Small Projects Problems :: 17 Dec 2003 10:51 :: Saulius :: Replies: 4 :: Views: 1104
i really need your help!!!
im working on my own project: automatic tap. when we put your hands in the sink, the tap automatically turns on and the water flows. one of my goals is that, sensor is as cheap as possible. so i decided to use ir sensor (the cheapest way!!!).- the i...
Hobby Circuits and Small Projects Problems :: 11 Sep 2003 16:45 :: eltonjohn :: Replies: 6 :: Views: 1895
a design to detect phone busy tone
i need to design a circuit to detect the signals coming to the phone,when the other line is busy,or no body answers.....any help?...
Hobby Circuits and Small Projects Problems :: 10 Jul 2003 16:31 :: artem :: Replies: 6 :: Views: 2185
looking for a tone encoder and decoder
i am looking for a tone encoder and decoder chip or a modem chip? anyone knows what can i use...
Hobby Circuits and Small Projects Problems :: 06 Apr 2003 23:34 :: Analyzer :: Replies: 1 :: Views: 482
requesting avrlib.zip
does anyone have te avrlib.zip file from http://hubbard.engr.scu.edu/avr/avrlibthe link didnt work.visioneer...
Microcontrollers :: 08 Feb 2003 16:05 :: visioneer :: Replies: 2 :: Views: 4950
audio decoder
hi!i want to build an audio decoder but i dont know what to use, i know that the input frequency is 15632hz, and i think i have to use a pll and a demodulator, are there any schematics that can help me?thanks!marmes...
Professional Hardware and Electronics Design :: 08 Jan 2003 6:17 :: flatulent :: Replies: 5 :: Views: 801
about ir communication
hi,i have a prolem.now i am design a ir transceiver,but i know nothing about it.can anybody give me some info?i need a near distance,about 57.6kbps data rate.my problem is:which photodiode is better?i did one,but data rate only 9.6kbps and sometimes ...
Professional Hardware and Electronics Design :: 09 Aug 2002 1:58 :: shanren :: Replies: 5 :: Views: 430
telephone dialer
i need a telephone dialer reference design to be interfaced to a microcontroller. where can i get it?thanks...
Professional Hardware and Electronics Design :: 17 May 2002 17:50 :: rajasekar :: Replies: 7 :: Views: 1009
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