axis 2100 cam refuses to work on 12v DC

it most likely needs both a + and - voltage source internally.

--
"I\'m never wrong, once i thought i was, but was mistaken"
Real Programmers Do things like this.
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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

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

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)

Here is a look inside the 2100

I took a hires picture, you can see a little of the powersupply input circuitry.

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

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.

--
"I'm never wrong, once i thought i was, but was mistaken"
Real Programmers Do things like this.
http://webpages.charter.net/jamie_5

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.

--
"I'm never wrong, once i thought i was, but was mistaken"
Real Programmers Do things like this.
http://webpages.charter.net/jamie_5

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

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

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

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.

--
"I\'m never wrong, once i thought i was, but was mistaken"
Real Programmers Do things like this.
http://webpages.charter.net/jamie_5

Its "Cameras" dumbass.

They have my pity.

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"

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

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