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axis 2100 cam refuses to work on 12v DC

L

lentildude

Jan 1, 1970
0
I have an axis 2100 webserver cam that runs from a 12vac plugpack. I
want to run it on 12v dc and it refuses to work. It seems to want ac,
perhaps the 50hz for a clock or something.

I DONT want to have a 12v>240v inverter just to run this as
the camera will run from a car battery and solar panel so dont want
to
waste power. Can I trick the camera by somehow making a 50hz
oscillator and somehow mixing it on the gnd line of the 12v dc??
Im not sure how to do this.


Any tricks/tips/links to a circuit appreciated.
 
J

Jamie

Jan 1, 1970
0
lentildude said:
I have an axis 2100 webserver cam that runs from a 12vac plugpack. I
want to run it on 12v dc and it refuses to work. It seems to want ac,
perhaps the 50hz for a clock or something.

I DONT want to have a 12v>240v inverter just to run this as
the camera will run from a car battery and solar panel so dont want
to
waste power. Can I trick the camera by somehow making a 50hz
oscillator and somehow mixing it on the gnd line of the 12v dc??
Im not sure how to do this.


Any tricks/tips/links to a circuit appreciated.
it most likely needs both a + and - voltage source internally.
 
J

John Bordynuik

Jan 1, 1970
0
John Bordynuik selects "Can I trick the camera by somehow making a 50hz
oscillator and somehow mixing it on the gnd line of the 12v dc??"

A thyristor bridge inverter could provide 12VAC from 12VDC. This is
probably your best bet. How much current?

Regards,

John Bordynuik
 
M

Michael A. Terrell

Jan 1, 1970
0
Jamie said:
it most likely needs both a + and - voltage source internally.


Wrong. A lot of those AC powered cameras have an internal power
transformer and use a 12 VAC input to allow them to be classed as a "Low
Voltage Device" which does not require the wiring to be installed by an
electrician.


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida
 
L

lentildude

Jan 1, 1970
0
John Bordynuik selects "Can I trick the camera by somehow making a
50hz
oscillator and somehow mixing it on the gnd line of the 12v dc??"


A thyristor bridge inverter could provide 12VAC from 12VDC. This is
probably your best bet. How much current?


Thanks for replies, It need at least 1 amp. It will be running off
a car battery (solar charged)
so needs to be a simple reliable and efficient 13.8vdc to 12v ac
inverter.

Do you have a link to such a circuit?

(Come to think of it I have a 24v ac irrigation solenoid that I would
also like to run off a car battery)
 
M

mpm

Jan 1, 1970
0
  Wrong. A lot of those AC powered cameras have an internal power
transformer and use a 12 VAC input to allow them to be classed as a "Low
Voltage Device" which does not require the wiring to be installed by an
electrician.

Mike,
Are you referring to NEC Code here?
Because wouldn't 12vdc ALSO be considered a low voltage device??
I don't have the codebook in front of me, but I thought the cutoff was
50volts (DC or AC, makes no difference??)

I would think it more likely they're just saving costs.
A typical DC wall wart cost more than a similar power AC style.
By many dollars in most cases.

-mpm
 
J

Jamie

Jan 1, 1970
0
Michael said:
Wrong. A lot of those AC powered cameras have an internal power
transformer and use a 12 VAC input to allow them to be classed as a "Low
Voltage Device" which does not require the wiring to be installed by an
electrician.
Well that sounds like hog wash to me but what ever, if you say so.

I for one know for a fact that many device require AC only input
because they require a dual rail supply also, many devices create a
virtual - reference which makes it not possible to share the the sources
common.
 
J

Jamie

Jan 1, 1970
0
mpm said:
Mike,
Are you referring to NEC Code here?
Because wouldn't 12vdc ALSO be considered a low voltage device??
I don't have the codebook in front of me, but I thought the cutoff was
50volts (DC or AC, makes no difference??)

I would think it more likely they're just saving costs.
A typical DC wall wart cost more than a similar power AC style.
By many dollars in most cases.

-mpm
50 volts is the cut off.
anything under that is not Nec regulated how ever. That was covered in
our last refresher course we need talk once a year.
 
H

Homer J Simpson

Jan 1, 1970
0
Are you referring to NEC Code here?
Because wouldn't 12vdc ALSO be considered a low voltage device??

We referred to that as extra low voltage - 120/240 was low voltage to us.
 
M

Michael A. Terrell

Jan 1, 1970
0
mpm said:
Mike,
Are you referring to NEC Code here?
Because wouldn't 12vdc ALSO be considered a low voltage device??
I don't have the codebook in front of me, but I thought the cutoff was
50volts (DC or AC, makes no difference??)

I would think it more likely they're just saving costs.
A typical DC wall wart cost more than a similar power AC style.
By many dollars in most cases.

-mpm


You don't get as much isolation for multiple cameras with a common DC
source, but a number of cameras can run from the same AC source with no
ground loops. Yes, a super cheap camera that is not made for multiple
camera installations can get away with a really crappy wall wart, but
some of the security cameras are still made for AC operation, to replace
failing vidicon cameras without rewiring. If the camera calls for AC,
that's what it needs.

Low voltage is typically in the 24 volt, or less range for AC. it is
also referred to as "Class 2" wiring. Sound systems with 25 volt line
output are just barely "Class 2".

--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida
 
M

Michael A. Terrell

Jan 1, 1970
0
Jamie said:
Well that sounds like hog wash to me but what ever, if you say so.

I for one know for a fact that many device require AC only input
because they require a dual rail supply also, many devices create a
virtual - reference which makes it not possible to share the the sources
common.


Your education is sorely lacking when it comes to ground loops in
Video Systems. Cameras that operate on "Class 2" AC wiring have been in
use for over 40 years for very valid reasons. Why do you need a dual
rail, when a 7660 chip will give you a few mA for bias, or to power a
couple op amps? Its cheaper and more reliable.


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida
 
J

Jamie

Jan 1, 1970
0
Michael said:
Your education is sorely lacking when it comes to ground loops in
Video Systems. Cameras that operate on "Class 2" AC wiring have been in
use for over 40 years for very valid reasons. Why do you need a dual
rail, when a 7660 chip will give you a few mA for bias, or to power a
couple op amps? Its cheaper and more reliable.
oh go pound sand, we have camera's all over the place at my place of
employment, i service them quite often. I have never had any issues with
them as you speak of. when i do, you'll be the first one to know.
we have a variety of ones that operate from low voltage AC,DC, 120 AC
etc.. connected in the video stations...

Like i said, I'll let you know when i run into issue.
 
M

Michael A. Terrell

Jan 1, 1970
0
Jamie said:
oh go pound sand, we have camera's all over the place at my place of


Its "Cameras" dumbass.

employment, i service them quite often.


They have my pity.

I have never had any issues with
them as you speak of. when i do, you'll be the first one to know.


No, you've told me that you know everything and claim to never be
wrong so all I will do is smile and hit "delete"

we have a variety of ones that operate from low voltage AC,DC, 120 AC
etc.. connected in the video stations...


Tell me, "Never Wrong", just how much hum was to be imposed on the
coaxial shield before it will show up in the picture?


Like i said, I'll let you know when i run into issue.


You don't think much of yourself if you can't even use a capital "I"
when referring to yourself.


You are an issue. I have serviced cameras from the early '70s,
including studio color cameras for broadcast stations. Half assed, low
res security cameras are a joke, and you know it.


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida
 
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