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Telephone


Sci.Electronics.Basics is a worldwide Usenet news group that is used to discuss basic electronics questions.

We found 130 threads matching "telephone"

You are looking at page 1 of 4.

The most relevant threads are listed first

On hold telephone message circuit

Charles Jean - 2006-12-06 13:59:00
Is there a way to play a wav file over an open telephone line? Can the earphone output of a sound card be used? Would it need to be amplified or attenuated? Capacitance coupled? ...On hold telephone message circuit

Re: DIY electromagnet under £100: Disappointing results

Archimedes' Lever - 2009-10-10 17:57:00
On Thu, 08 Oct 2009 16:40:13 GMT, Jan Panteltje wrote: > Bell accidently got the telephone working, Bell did not invent the telephone. Meucci did. ...Re: DIY electromagnet under £100: Disappointing results

how I can connect 89c51serial port to telephone lineto send data?

2007-05-27 13:07:00
dear all, I try to send vedio from cctv via telephone line I connect the cctv camera output to ADC and the output of the ADC to Atmel 89c51 micocontroller to send the data serial but I want to connect the output of the atmel89c51 to the telephone line please help? what the next step ...how I can connect 89c51serial port to telephone lineto send data?

Handset telephone amplifier

SBS - 2007-09-15 13:57:00
Hi, I have to build a telephone handset amplifier which has to amplify both the speaker on the ear (incoming sound) and the mic (outgoing voice). It has to be powered by 3xAA/AAA batteries or 1x9V battery. Can you please suggest me a tested scheme? Rgeards. ...Handset telephone amplifier

EDT [European Deaf Telephone] and EDTN are the TDD [Telecommunications Device for the Deaf] protocols used in Switzerland. Where can I find numbers/tones?

Radium - 2007-08-27 17:03:00
Hi: I've posted this before but never got a rational scientific response. Sorry for the repetition and any annoyance it causes but I am really interested in this. EDT [European Deaf Telephone] and EDTN are the TDD [Telecommunications Device for the Deaf] protocols used in Switzerland. Where...EDT [European Deaf Telephone] and EDTN are the TDD [Telecommunications Device for the Deaf] protocols used in Switzerland. Where can I find numbers/tones?

EDT [European Deaf Telephone] and EDTN are the TDD protocols used in Switzerland

Radium - 2007-08-24 00:29:00
Hi: EDT [European Deaf Telephone] and EDTN are the TDD protocols used in Switzerland. Where can I find technical information about the EDT/ EDTN? Also, I would like to hear some tones resulting from the remote EDTs/EDTNs located in Switzerland. I live in USA, so if I dial an EDT/ EDTN number ...EDT [European Deaf Telephone] and EDTN are the TDD protocols used in Switzerland

Re: Please Assist: Help Requested for EDTN

Jeff Liebermann - 2007-10-29 01:49:00
"Green Xenon [Radium]" hath wroth: > I contacted them almost a month ago. I still haven't gotten any answerns > on EDTN! > > Also, for this past month I've dedicated my research to finding what > EDTN stands > for EDT is European Deaf Telephone. It's the phone and protocol used in...Re: Please Assist: Help Requested for EDTN

EDT [European Deaf Telephone] and EDTN are the TDD [Telecommunications Device for the Deaf] protocols used in Switzerland. Where can I find tones/numbers?

Radium - 2007-08-27 19:49:00
Hi: I've posted this before but never got a rational scientific response. I apologize profusely for the repetition and any annoyance it causes but I am really interested in this. EDT [European Deaf Telephone] and EDTN are the TDD [Telecommunications Device for the Deaf] protocols used in Sw...EDT [European Deaf Telephone] and EDTN are the TDD [Telecommunications Device for the Deaf] protocols used in Switzerland. Where can I find tones/numbers?

Question - how to hook up telephone through stereo?

2006-09-19 14:38:00
Hello I have a question that I'm desperately searching an answer for. I am wondering if it is possible (I'm pretty sure it is) to hook up the telephone through my stereo (or even the computer). I have a group meeting to host at my place, and would like to have a friend who will be calling in vi...Question - how to hook up telephone through stereo?

Re-post -- EDT [European Deaf Telephone] and EDTN are the TDD protocols used in Switzerland

Radium - 2007-08-24 15:50:00
Hi: EDT [European Deaf Telephone] and EDTN are the TDD protocols used in Switzerland. Where can I find technical information about the EDT/ EDTN? Also, I would like to hear some tones resulting from the remote EDTs/EDTNs located in Switzerland. I live in USA, so if I dial an EDT/ EDTN n...Re-post -- EDT [European Deaf Telephone] and EDTN are the TDD protocols used in Switzerland

Re: recommendation for book on fixing telephones

Ross Herbert - 2007-03-18 02:29:00
On 17 Mar 2007 19:07:11 -0700, "badgerboy" wrote: > I've been looking around for a book on fixing telephones--not ancient > models but not new cheap junk either. Haven't seen anything that > looked good... Any recommendations? > > thanks, Guy That's an open-ended question... It ...Re: recommendation for book on fixing telephones

Re: Muddle over left/right channel of TRS plug

Dave Plowman (News) - 2009-09-25 18:44:00
In article , Rich Grise wrote: > > > As far as the RCA plugs are concerned, the Red plug has long been > > > Right. > > > > Pro gear doesn't use RCA plugs. But can use TRS. > Is "TRS" a mnemonic for something? All I can think of when I see it is > the Radio Shack/Tandy TR...Re: Muddle over left/right channel of TRS plug

telephone monitoring circuitry

Will Barbour - 2007-04-08 12:58:00
Hi This seems to be an active newsgroup and so I was wondering if there is someone who could help me with a techie problem... I am developing hardware/software to monitor the performance of a small call centre (~5 phones). On a daily basis I need to retrieve statistics such as the amoun...telephone monitoring circuitry

Re: DSL phone line

Lord Garth - 2008-05-05 20:40:00
"Stumpy" wrote in message news:2cednXWEyqQyOYLVnZ2dnUVZ_rKtnZ2d@earthlink.com... > > > > > > > > These polarity changes have been designed out of newer switching > > > > systems since the early 80's....however, if the CO is old, it will work > > > > as described. > > > > > > > > ...Re: DSL phone line

remote monitoring

alitufan - 2006-11-12 07:56:00
I need to help for my project which is telemetry disagn for to sent sun car's or hydromobile's information(current, voltage,speed,...) with mobile telephone via RS232 to pitstop. ...remote monitoring

answering machine

Eve L Dewer - 2006-09-11 12:54:00
I am seeking a telephone answering machine that will only record the call unless a password is provided, and will then ring the phone. Is there such a thing? ...answering machine

Re: Stripboard wire size?

Charlie Siegrist - 2007-05-08 08:47:00
Circa 8 May 2007 04:44:52 -0700 recorded as looks like Chris sounds like: > Hi, Guy. Since you didn't describe your project at all, this may not > apply (for instance, if any of your wires are carrying an amp or more > of current, or if you're using more than 24 volts on any line). Bu...Re: Stripboard wire size?

Why is a phone circuit plugged into 115 Volts

searoom - 2007-02-03 15:49:00
I just bought a house in Vallejo, California and found a telephone wire in one room leading to a plug that is plugged into a 115 Volt outlet... Anyone know why? Thanks. ...Why is a phone circuit plugged into 115 Volts

How about ETDN?! (was Re: EDT [European Deaf Telephone] and EDTN are the TDD [Telecommunications Device for the Deaf] protocols used in Switzerland. Where can I find numbers/tones?)

Green Xenon [Radium] - 2007-09-25 21:31:00
On Aug 28, 1:38 pm, "\Blumstein" wrote in http://groups.google.com/group/comp.dcom.telecom.tech/msg/de617188db2f4f6d : > On Aug 27, 2:03 pm, Radium wrote: > > Hi: > > I've posted this before but never > > got a rational scientific response. > > Sorry for the repetiti...How about ETDN?! (was Re: EDT [European Deaf Telephone] and EDTN are the TDD [Telecommunications Device for the Deaf] protocols used in Switzerland. Where can I find numbers/tones?)

Re: Part Search

John Fields - 2008-05-08 20:07:00
On Thu, 8 May 2008 10:44:16 -0700 (PDT), lerameur wrote: > Hello, > > anybody has the datasheets for the following two parts: > > T25089 > and > MK50981N > > both of them should be TELEPHONE DTMF DIALER,16-PIN DIP --- http://www.datasheetcatalog.com/datasheets_pdf/T/C/M/5/TCM50...Re: Part Search

Question on phone cord connectors

Dave - 2008-10-16 09:34:00
If the connector for the phone line coming from the wall is an RJ-11, what connector is used for the coiled cord connecting the handset to the telephone? It seems a little smaller. Any help is appreciated... Thanks, Dave ...Question on phone cord connectors

Re: Phone problems after thunderstorm

Ross Herbert - 2008-09-02 23:38:00
On Tue, 02 Sep 2008 08:55:28 -0700, Joerg wrote: :Phil Allison wrote: :> "Ross Herbert" :> :> > The main junction cables between exchanges are usually pressurised :> > (usually dry :> > air) to prevent water ingress when minor damage like pin holes in the :> > sheath :> > occ...Re: Phone problems after thunderstorm

Re: dialer chip NTE1691

2008-04-29 11:01:00
On Tue, 29 Apr 2008, lerameur wrote: > Hello, > > I would like to use a dialer chip the NTE1691. Can some tell me how to > use the RC pin, There a three pins used ar reference frequency, The > datasheet does not say how to hook them up (RC), and also it do not > talk about the output f...Re: dialer chip NTE1691

Re: how much current can AWG wire handle

Peter Hucker - 2008-12-14 13:01:00
On Sun, 14 Dec 2008 05:08:38 -0000, krw wrote: > In article , none@spam.com > says... > > On Sat, 13 Dec 2008 00:38:33 -0000, krw wrote: > > > > > In article , none@spam.com > > > says... > > > > On Fri, 12 Dec 2008 23:55:44 -0000, krw wrote: > > > > > > > > > ...Re: how much current can AWG wire handle

Re: Please Assist: Help Requested for EDTN

Jerry Avins - 2007-09-28 13:13:00
Green Xenon [Radium] wrote: > Hi: > > Will someone please assist me in answering my questions in the below > thread? ... Where did you hear of your particular combination of letters? Isn't that a good place to start if you want to track down its meaning? You seem to have an id...Re: Please Assist: Help Requested for EDTN

Messages Deleted on Answering Machine

Senin - 2008-05-20 03:41:00
My housekeeper accidentally deleted all the messages (including my 2 year old daughter's) from my Uniden 900 MHz 378 series telephone answering machine. Any possibible way of getting those messages back? ...Messages Deleted on Answering Machine

Re: Electrical Safety

2007-08-13 21:20:00
IIRC, the cutoff for "safe" is somewhere around 60v, which determined the rail voltage for telephone switches or something. I've gotten bitten by 120v before. It hurt, but caused no permanent damage, not that I'd want to do it again. "Safe" is different than "I got away with it" too - a li...Re: Electrical Safety

Re: question about microcontroler oscillator

Michael A. Terrell - 2007-11-02 15:32:00
Eeyore wrote: > > Jamie wrote: > > > Any one that monitors this group on the regular bases knows what > > i'm talking about. > > They know you're an idiot who doesn't even know what a coupling cap is. > > Graham They know that you're an anal retantive ass with a telep...Re: question about microcontroler oscillator

Re: Switch terminology?

Eeyore - 2007-03-15 17:58:00
Esther & Fester Bestertester wrote: > > If that is what you desire, a double pole triple throw rotary switch would > > work if you short the two poles together. Rocker switches have only > > two positions plus maybe a center off so that would not be a reasonable > > choice. > ...Re: Switch terminology?

Re: Three Battery Awards

Lofty Goat - 2008-09-15 20:45:00
On Mon, 15 Sep 2008 12:08:31 -0700, Bret Cahill wrote: > At a minimum it would help prove the limits to battery improvements like > Betz for wind power and Carnot for heat engines. That would depend upon what one defines as a "battery". Does one exclude things like quantum-nucleonic device...Re: Three Battery Awards

Re: Tube Headphone Amp Schematic Needed

Tim Wescott - 2008-08-03 16:04:00
Dave.H wrote: > I want to build a headphone amp to connect to my laptop's audio > output, and thought a tube based one would be a nice change from all > the IC driven ones I've built in the past. I would prefer a simple one > with low cost components, and low voltage operation, if possible, ...Re: Tube Headphone Amp Schematic Needed

Re: Resistors

John Larkin - 2007-02-27 23:17:00
On Wed, 28 Feb 2007 09:38:02 +1300, "Roger Dewhurst" wrote: > Has anyone any ideas making resistors in the 1 ohm to 20 ohm range from > materials likely to be around the house somewhere? > > R > Iron picture-hanger wire? Aluminum foil? Christmas tinsel (aluminum, not mylar.) Light b...Re: Resistors

Re: transistor in the industrial production

Stanislaw Flatto - 2007-02-24 19:27:00
GiuseppeDini wrote: > hello! > I have a make a research for the school about "the role of transistor > in the industrial production". > I've not many ideas about the topics I should analyze in depth. > Please suggest me two or three ideas. > > Giuseppe > The replaceme...Re: transistor in the industrial production

telephone circuit

lerameur - 2008-09-02 15:16:00
Hello, I am using a pic controller for a dialer project. My goal is to dial a number, when the receiving end picks up, then send some dtmf tone for a few minutes. Sounds simple, but I do not know how to tell my controller that the receiving end has picked up or not. Right now I just let it r...telephone circuit

Re: data communication

Jasen Betts - 2008-11-14 04:32:00
On 2008-11-13, sirfmereliay@googlemail.com wrote: > When the average amplitude is non zero then the problem arises is > ______________???? here's three, there are others. it doesn't work well with transformers. it charges up line capacitance and makes the line harder to drive correct...Re: data communication

Re: op amp inputs

John Popelish - 2007-08-31 19:47:00
Jamie wrote: . > And also, if I remember correctly, the LM324 is one of those op-amps > that has a discontinued output. meaning, when the follower outputs > cross the zero path or near it, there is no minimum bias for both rails > being applied to maintain constant current. In a way, thi...Re: op amp inputs

Re: Name that component!

Wim Lewis - 2007-01-26 12:17:00
In article , John Fields wrote: > On Fri, 26 Jan 2007 12:39:49 +0000, Eeyore > wrote: > > James wrote: > > > I think what I'm looking for is called a Latching Relay. > > > > Yes. Or bistable relay. > > Also, unless the toggle is mechanical, he'll have to use a positive > pulse ...Re: Name that component!

Re: Telephony

gethostbyname@gmail.com - 2007-02-06 19:25:00
Homer J Simpson escreveu: > wrote in message > news:1170804158.003703.19470@a34g2000cwb.googlegroups.com... > > > I would like to develop a circuit to disconnect a dial-up connection > > when I receive the signal of a call in waiting. Could someone speak me > > where I could ge...Re: Telephony

Re: Twin T circuit wanted

John Larkin - 2010-06-11 16:21:00
On Fri, 11 Jun 2010 15:02:24 -0500, Vladimir Vassilevsky wrote: > > > John Larkin wrote: > > > > Usenet, and email, remove the emotional feedbacks you get in person, > > or even over the telephone. That makes for some pathological behavior. > > And people develop personnas that ...Re: Twin T circuit wanted

Re: Tri-state with transistor?

FyberOptic - 2006-09-06 12:15:00
jasen wrote: > > Yup that'd work , you've just "invented" the open-collector output. I seem to have a knack for "inventing" things. Maybe next I'll invent the telephone. > > Another trick is to put a diode in series with the ic's output. Hey that does sound like an interesting tr...Re: Tri-state with transistor?
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