Re: axis 2100 cam refuses to work on 12v DC

Jamie wrote:

Michael A. Terrell wrote:

Jamie wrote:

lentildude wrote:


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.

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



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.


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
.

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