L
Lynn
Guest
I have a schematic for getting 48 volts off the phone but can't read the component sizes.
Anyone have it?
Regards
Lynn
Anyone have it?
Regards
Lynn
Guest
>"Apply to his tongue >:-} "
And hope nobody calls.
And hope nobody calls.
D
David Eather
Guest
On Tue, 17 Feb 2015 08:51:29 +1000, Lynn <greenone2@gmail.com> wrote:
forget it. Apart from issues of illegality getting any useful amount of
power is impossible.
forget it. Apart from issues of illegality getting any useful amount of
power is impossible.
J
John Larkin
Guest
On Mon, 16 Feb 2015 14:51:29 -0800 (PST), Lynn <greenone2@gmail.com>
wrote:
Could you please be a little less specific?
wrote:
Could you please be a little less specific?
A
amdx
Guest
On 2/16/2015 4:51 PM, Lynn wrote:
What are you going to do with the 48 Volts?
Mikek
What are you going to do with the 48 Volts?
Mikek
J
Jim Thompson
Guest
On Mon, 16 Feb 2015 18:51:22 -0600, amdx <nojunk@knology.net> wrote:
Apply to his tongue >:-}
...Jim Thompson
--
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| San Tan Valley, AZ 85142 Skype: skypeanalog | |
| Voice
480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
Apply to his tongue >:-}
...Jim Thompson
--
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| San Tan Valley, AZ 85142 Skype: skypeanalog | |
| Voice
480)460-2350 Fax: Available upon request | Brass Rat || E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
P
Pimpom
Guest
Michael Black wrote:
a convenient spot some 50 m from my house. I rigged up a simple
alarm circuit that was triggered by a complete loss of voltage
but not by a normal drop during calls. I nearly caught them the
next time they cut the line. But they must have seen me and my
son rushing out of the house - they left my line alone after
that.
Several years ago, some miscreants kept cutting my phone line at
a convenient spot some 50 m from my house. I rigged up a simple
alarm circuit that was triggered by a complete loss of voltage
but not by a normal drop during calls. I nearly caught them the
next time they cut the line. But they must have seen me and my
son rushing out of the house - they left my line alone after
that.
M
Michael Black
Guest
On Mon, 16 Feb 2015, jurb6006@gmail.com wrote:
line, I think there must have been some problem at the time, but I can't
remember.
The phone rings, and I did get a jolt out of it.
Michael
That happened once to me. I was measuring the voltage across the phone
line, I think there must have been some problem at the time, but I can't
remember.
The phone rings, and I did get a jolt out of it.
Michael
J
Jasen Betts
Guest
On 2015-02-16, Lynn <greenone2@gmail.com> wrote:
No, show us.
--
umop apisdn
No, show us.
--
umop apisdn
D
default
Guest
On Tue, 17 Feb 2015 09:00:42 +1000, "David Eather" <eather@tpg.com.au>
wrote:
I donno. Some years ago I had some problems with my phone line so
built a simple sloped cabinet with meters and switches to monitor the
voltage and current. Turned out the meters were hard to read because
there wasn't enough light. I wired some 12V strip leds 18 leds total
into a little channel I put above the meters. I forget what dropping
resistor I used but it works well enough as a night light - and enough
to read by when the phone is off hook.
I think it would make a decent battery charger for flashlight float
charging and maybe operate some thing small like an electronic
doorbell, PIR detector, etc..
As for the illegality. Why would that be now that ATT isn't running
the show? I steal a milliwatt or two (just measured it 1ma @48 VDC -
50 mw) It isn't connected to any other source of power and It's been
working for >10 years now. Go off hook to get a lot of bright light
and that works too - but something at the telco CO glitches the line
periodically (so I guess they might not like me doing that)
wrote:
I donno. Some years ago I had some problems with my phone line so
built a simple sloped cabinet with meters and switches to monitor the
voltage and current. Turned out the meters were hard to read because
there wasn't enough light. I wired some 12V strip leds 18 leds total
into a little channel I put above the meters. I forget what dropping
resistor I used but it works well enough as a night light - and enough
to read by when the phone is off hook.
I think it would make a decent battery charger for flashlight float
charging and maybe operate some thing small like an electronic
doorbell, PIR detector, etc..
As for the illegality. Why would that be now that ATT isn't running
the show? I steal a milliwatt or two (just measured it 1ma @48 VDC -
50 mw) It isn't connected to any other source of power and It's been
working for >10 years now. Go off hook to get a lot of bright light
and that works too - but something at the telco CO glitches the line
periodically (so I guess they might not like me doing that)
J
Jim Thompson
Guest
On Tue, 17 Feb 2015 11:29:41 +0530, "Pimpom" <Pimpom@invalid.invalid>
wrote:
Long long ago a buddy of mine worked for a military microwave outfit.
The neighbor kids were vandalizing his Christmas decorations, so he
set up a radar unit under the eaves of his house... promptly snatching
3 kids... they never returned.
(This was way before commercially available motion detectors.)
...Jim Thompson
--
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| San Tan Valley, AZ 85142 Skype: skypeanalog | |
| Voice480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
wrote:
Long long ago a buddy of mine worked for a military microwave outfit.
The neighbor kids were vandalizing his Christmas decorations, so he
set up a radar unit under the eaves of his house... promptly snatching
3 kids... they never returned.
(This was way before commercially available motion detectors.)
...Jim Thompson
--
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| San Tan Valley, AZ 85142 Skype: skypeanalog | |
| Voice
480)460-2350 Fax: Available upon request | Brass Rat || E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
Guest
>"An old idea. Google "trimline phone". "
Not old to him apparently. Gotta realize at a certain age people are simply too young to remember some shit. I run into that more and more eah year.
But on to the subject. I don't rightly remember fer sure but if you were to load a phone line with about a 200 ohm resistor it would trip the line on. This is always in constant current modes but there are two constant current modes.
The lights on a trimline phone ran when tripped, which means on something like 5 or 6 volts. I imagine back then, at ridiculous bunch of trouble, you could get a lightbulb that could run off the phone line without tripping it.. Boil it down, if you keep it at 1,000 ohms, 40 volts gives you 1.6 watts. I am not sure but I doubt 1,000 ohms will trip it. Now what keywords would I use in front of "wiki" to get that on the web ? It is not SS-7 or whatever, it is not DTMF, how the hell would you phrase that in a search ?
Maybe I will just go get a frikken resistor and try it and see what trips it. I got a half a mind to do that. Fuck it, BBIAM.
Wiki's article ain't bad :
http://en.wikipedia.org/wiki/Tip_and_ring
but it does not have the info.
BBIAM
OK,
http://en.wikipedia.org/wiki/Telephone
It is 300 ohms. However I think it would be foolhardy to pull that much. Stick with your free 1.6 watts and shadddapp. Whaddya want fer nutin ?
Of course it also says that ringing is 90 VAC, 20 Hz. Then we get into the RE number, remember that ? Ringer Equivalence. The problem with too many added up REs on the system is that for one it costs them a dime. Number two, too much and it could false trip the system. I had this happen at the old house where the cable down the street was breached by water and corroded. they had to keep changing my pair. I was on a first name basis almost with the supervisors, because they would understand what I saidm, it happened before bla bla, I don't need any canned responses nor to go to my network box. It would start to ring and the corrosion would conduct enough current the computer would trip, but not long enough so even if I picked it up they were gone and this was al too fast for the caller ID to work. But I could call out fine of course. The voltage is lower.
Now on ANOTHER ote that really is pertinent to this, we have my Grandmothers phone. rotary dial, but it has an amplifier in the handset for the hard of hearing. One time there were three of us on extension phones at the same time and it lost most of its level, to where you could not hear.
Explanation : The power to run that little amplifier is not free. There stil has yo be six volts for things to work. When oit gets too low it sdoesn't.. And they cannot give you solid voltage because them your phone would not be able to modulate it. So just because of how the system is designed they can be pretty sure you are not going to jumpstart your cap off of it.
But really, if you were about homeless n shit, living in an abandoned house and couls access some phone lines, you could trickle charge a battery.
Shit, if you build INPUT current limiting into the feedback loop of a SEPIC convertor you could do alot of things with that voltage.
Betch'd be illegal to sell though.
Not old to him apparently. Gotta realize at a certain age people are simply too young to remember some shit. I run into that more and more eah year.
But on to the subject. I don't rightly remember fer sure but if you were to load a phone line with about a 200 ohm resistor it would trip the line on. This is always in constant current modes but there are two constant current modes.
The lights on a trimline phone ran when tripped, which means on something like 5 or 6 volts. I imagine back then, at ridiculous bunch of trouble, you could get a lightbulb that could run off the phone line without tripping it.. Boil it down, if you keep it at 1,000 ohms, 40 volts gives you 1.6 watts. I am not sure but I doubt 1,000 ohms will trip it. Now what keywords would I use in front of "wiki" to get that on the web ? It is not SS-7 or whatever, it is not DTMF, how the hell would you phrase that in a search ?
Maybe I will just go get a frikken resistor and try it and see what trips it. I got a half a mind to do that. Fuck it, BBIAM.
Wiki's article ain't bad :
http://en.wikipedia.org/wiki/Tip_and_ring
but it does not have the info.
BBIAM
OK,
http://en.wikipedia.org/wiki/Telephone
It is 300 ohms. However I think it would be foolhardy to pull that much. Stick with your free 1.6 watts and shadddapp. Whaddya want fer nutin ?
Of course it also says that ringing is 90 VAC, 20 Hz. Then we get into the RE number, remember that ? Ringer Equivalence. The problem with too many added up REs on the system is that for one it costs them a dime. Number two, too much and it could false trip the system. I had this happen at the old house where the cable down the street was breached by water and corroded. they had to keep changing my pair. I was on a first name basis almost with the supervisors, because they would understand what I saidm, it happened before bla bla, I don't need any canned responses nor to go to my network box. It would start to ring and the corrosion would conduct enough current the computer would trip, but not long enough so even if I picked it up they were gone and this was al too fast for the caller ID to work. But I could call out fine of course. The voltage is lower.
Now on ANOTHER ote that really is pertinent to this, we have my Grandmothers phone. rotary dial, but it has an amplifier in the handset for the hard of hearing. One time there were three of us on extension phones at the same time and it lost most of its level, to where you could not hear.
Explanation : The power to run that little amplifier is not free. There stil has yo be six volts for things to work. When oit gets too low it sdoesn't.. And they cannot give you solid voltage because them your phone would not be able to modulate it. So just because of how the system is designed they can be pretty sure you are not going to jumpstart your cap off of it.
But really, if you were about homeless n shit, living in an abandoned house and couls access some phone lines, you could trickle charge a battery.
Shit, if you build INPUT current limiting into the feedback loop of a SEPIC convertor you could do alot of things with that voltage.
Betch'd be illegal to sell though.
Guest
Now that I think about it, to get this power you need a coil that will present MORE than 300 ohms impedance to 20 Hz and up. Now where is that cool nomograph someone made around here ?
Really, 300 ohms at 20 Hz is a fukken HUGE coil. That means not saturating the core to that level either. What's more it is going to have a pretty high RE. Evenif IT doesn't drain all that is there, it is not the only thing on the line. Luckily ringers don't have coils and magnet anymore.
Really, 300 ohms at 20 Hz is a fukken HUGE coil. That means not saturating the core to that level either. What's more it is going to have a pretty high RE. Evenif IT doesn't drain all that is there, it is not the only thing on the line. Luckily ringers don't have coils and magnet anymore.
P
Phil Hobbs
Guest
On 2/17/2015 9:09 AM, default wrote:
An old idea. Google "trimline phone".
Cheers
Phil Hobbs
--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC
Optics, Electro-optics, Photonics, Analog Electronics
160 North State Road #203
Briarcliff Manor NY 10510
hobbs at electrooptical dot net
http://electrooptical.net
An old idea. Google "trimline phone".
Cheers
Phil Hobbs
--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC
Optics, Electro-optics, Photonics, Analog Electronics
160 North State Road #203
Briarcliff Manor NY 10510
hobbs at electrooptical dot net
http://electrooptical.net
P
Phil Hobbs
Guest
On 2/17/2015 12:59 AM, Pimpom wrote:
Cheers
Phil Hobbs
--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC
Optics, Electro-optics, Photonics, Analog Electronics
160 North State Road #203
Briarcliff Manor NY 10510
hobbs at electrooptical dot net
http://electrooptical.net
Michael Black wrote:
On Mon, 16 Feb 2015, jurb6006@gmail.com wrote:
"Apply to his tongue >:-}"
And hope nobody calls.
That happened once to me. I was measuring the voltage across
the
phone line, I think there must have been some problem at the
time,
but I can't remember.
The phone rings, and I did get a jolt out of it.
Several years ago, some miscreants kept cutting my phone line at
a convenient spot some 50 m from my house. I rigged up a simple
alarm circuit that was triggered by a complete loss of voltage
but not by a normal drop during calls. I nearly caught them the
next time they cut the line. But they must have seen me and my
son rushing out of the house - they left my line alone after
that.
Must not be much to do in your neighbourhood.
Cheers
Phil Hobbs
--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC
Optics, Electro-optics, Photonics, Analog Electronics
160 North State Road #203
Briarcliff Manor NY 10510
hobbs at electrooptical dot net
http://electrooptical.net
B
Bill Bowden
Guest
"Lynn" <greenone2@gmail.com> wrote in message
news:a022c825-d4bb-4c6f-86b0-220c44e2ba17@googlegroups.com...
I think the phone line is normally about 48 volts DC when the phone is
on-hook. There are some circuits around to light a LED when the phone is
off-hook. The circuit uses the 48 volts to turn off the LED when the phone
is on-hook and doesn't require much power from the line. You can't draw much
more than a few microamps from the line when the phone is on-hook. You can
draw several milliamps at a lower voltage (maybe 12) when the phone is
off-hook.
--- news://freenews.netfront.net/ - complaints: news@netfront.net ---
news:a022c825-d4bb-4c6f-86b0-220c44e2ba17@googlegroups.com...
I think the phone line is normally about 48 volts DC when the phone is
on-hook. There are some circuits around to light a LED when the phone is
off-hook. The circuit uses the 48 volts to turn off the LED when the phone
is on-hook and doesn't require much power from the line. You can't draw much
more than a few microamps from the line when the phone is on-hook. You can
draw several milliamps at a lower voltage (maybe 12) when the phone is
off-hook.
--- news://freenews.netfront.net/ - complaints: news@netfront.net ---
Guest
Can't do that, it'll make the line trip and you'll lose the call.
Then you got a light but not a phone. People will think you're hanging up on them.
Weren't some caller ID units line powered ? Maybe opt, maybe I imagined it, or was just unaware of the batteries.
D
default
Guest
On Mon, 16 Feb 2015 14:51:29 -0800 (PST), Lynn <greenone2@gmail.com>
wrote:
Check out this guy
http://www.sandman.com/telco.html
I wonder how one of those cheap Chinese buck switching regulators
would work on the phone line. Need a zener or two to protect them
from the ring signal, and drop some of the incoming voltage to keep it
below 40 volts...
wrote:
Check out this guy
http://www.sandman.com/telco.html
I wonder how one of those cheap Chinese buck switching regulators
would work on the phone line. Need a zener or two to protect them
from the ring signal, and drop some of the incoming voltage to keep it
below 40 volts...
Guest
>"I think the phone line is normally about 48 volts DC when ..."
My links cover that. Somewhat. It says 300 ohms, which would be 160 mA, but you'll never get that because the line trips and it drops. I think the voltage is more like 7 volts, but that also drops when there is more than one device picked up on the line. That's one of the reasons the volue changes when someone picks up an "extension" phone.
Of course "extension" is an old fashioned term, very few people whif landlines now only have one phone on the line.
I remember a long time ago around here it was illegal to hook up an "extension" phone. The reason ? Because the phone company charged to install it and a monthly charge. Plus around here for a long time you didn't even buy phones, the phone company supplied them. You paid extras per month for that trimline. Connecting your own phone to the line was technically theft of service.
There are regulations about just what you can connect to the phone lines. The wrong thing and you could damage telco equipment. Now that I think of it, at the TV shop a long time ago I blew out the cable system because of a ground fault. Knocked out the whole neighborhood I think. Of course I didn't confess, I called and complained that the cable was out
My links cover that. Somewhat. It says 300 ohms, which would be 160 mA, but you'll never get that because the line trips and it drops. I think the voltage is more like 7 volts, but that also drops when there is more than one device picked up on the line. That's one of the reasons the volue changes when someone picks up an "extension" phone.
Of course "extension" is an old fashioned term, very few people whif landlines now only have one phone on the line.
I remember a long time ago around here it was illegal to hook up an "extension" phone. The reason ? Because the phone company charged to install it and a monthly charge. Plus around here for a long time you didn't even buy phones, the phone company supplied them. You paid extras per month for that trimline. Connecting your own phone to the line was technically theft of service.
There are regulations about just what you can connect to the phone lines. The wrong thing and you could damage telco equipment. Now that I think of it, at the TV shop a long time ago I blew out the cable system because of a ground fault. Knocked out the whole neighborhood I think. Of course I didn't confess, I called and complained that the cable was out
Guest
>"> Now that I think about it, to get this power you need a coil that will >present MORE than 300 ohms impedance to 20 Hz "
I just checked Digikey and a 2 henry coil with 57 ohm DCR is like $26. Gor half theproice approximately you get ALOT more DCR.
If you rmember the old phones with the coil working the ringer, the wire in that coil was extremely thin. So obviously they did not quite need 2 Henries, but still if you want any useful DC that's what you'll need.
And someone mentioned using Zeners for protection from the ringing voltage ? You wouldn't need that with a huge coil.
I just checked Digikey and a 2 henry coil with 57 ohm DCR is like $26. Gor half theproice approximately you get ALOT more DCR.
If you rmember the old phones with the coil working the ringer, the wire in that coil was extremely thin. So obviously they did not quite need 2 Henries, but still if you want any useful DC that's what you'll need.
And someone mentioned using Zeners for protection from the ringing voltage ? You wouldn't need that with a huge coil.