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Handset telephone amplifier
SBS - 13:57 15-09-07
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/AA... Read More
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telephone monitoring circuitry
Will Barbour - 12:58 08-04-07
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 t... Read More
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Re: DSL phone line
Lord Garth - 20:40 05-05-08
"Stumpy" wrote in message
news:2cednXWEyqQyOYLVnZ2dnUVZ_rKtnZ2d@earthlink.com...
> > > >
> > > > These polarity changes have been designed out of newer switching
> > > ... Read More
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remote monitoring
alitufan - 07:56 12-11-06
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.... Read More
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Can landline wiring be adapted for VOIP?
14:00 04-04-08
An extension from our landline telephone service runs into a TIVO
receiver from a conveniently located RJ-11 wall jack allowing the
recorder to update broadcast schedules. I have... Read More
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Re: Part Search
John Fields - 20:07 08-05-08
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... Read More
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Re: Stripboard wire size?
Charlie Siegrist - 08:47 08-05-07
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,... Read More
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answering machine
Eve L Dewer - 12:54 11-09-06
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?
... Read More
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Re: dialer chip NTE1691
11:01 29-04-08
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 refe... Read More
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Re: Electrical Safety
21:20 13-08-07
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 c... Read More
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Re: Switch terminology?
Eeyore - 17:58 15-03-07
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. Rocke... Read More
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Re: Resistors
John Larkin - 23:17 27-02-07
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 ho... Read More
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Re: M-Bus
Jasen Betts - 17:13 13-07-07
On 2007-07-13, pedast@gmail.com wrote:
> hi all
>
> i'm searching for a M-BUS sniffer?
> M-Bus is a special bus where the master will send a voltage (idle
> state typi... Read More
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Re: Name that component!
Wim Lewis - 12:17 26-01-07
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.... Read More
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Re: transistor in the industrial production
Stanislaw Flatto - 19:27 24-02-07
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... Read More
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Re: op amp inputs
John Popelish - 19:47 31-08-07
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 zer... Read More
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