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axis 2100 camera only runs 12v ac

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.
 
D

Dan N

Jan 1, 1970
0
Axis has a mailing list, you might find more answers from there. They've
changed their website, so I'm not sure how to find anything anymore. The
mailing list is at [email protected]. You might try sending that
address an email with "Subscribe" as the subject or body.

Dan
 
P

Phil Allison

Jan 1, 1970
0
"lentildude"
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.


** Most devices that run off AC plug packs do so in order to generate
internal DC rails of both polarities.

Some employ voltage multiplier ccts to generate DC rails of double the peak
AC voltage.




......... Phil
 
F

Franc Zabkar

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.

Assuming your camera can tolerate a square wave, use a H-bridge to
convert your 12VDC car battery source to AC.

- Franc Zabkar
 
L

lentildude

Jan 1, 1970
0
I was looking at inverter circuits, I would need 12vac at 1 amp but
would need to be efficient to not
drain car battery. If you have any links to any simple low cost
circuits, most appreciated

BTW

Here is a look inside the 2100
http://www.alttokyo.com/Jauction/2100.JPG
I took a hires picture, you can see a little of the powersupply input
circuitry.
 
B

Bob Urz

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.

How many amps does it need?

If your a scrounger, find a 9 volt or so DC wall wart that has
screws in it rather than being welded together.

Break the case open. Take the diodes and caps out and run directly from
the transformer secondary. Might be close enough to work.

Bob
 
P

Phil Allison

Jan 1, 1970
0
"Bob Urz"
How many amps does it need?

If your a scrounger, find a 9 volt or so DC wall wart that has
screws in it rather than being welded together.

Break the case open. Take the diodes and caps out and run directly from
the transformer secondary. Might be close enough to work.


** ROTFL !!!!

Bob ERRS aka " The Nebraska Redneck " does it again !

What a fucking, illiterate Septic Moron !!!!





........ Phil
 
W

Wayne Reid

Jan 1, 1970
0
Bob Urz said:
How many amps does it need?

If your a scrounger, find a 9 volt or so DC wall wart that has
screws in it rather than being welded together.

Maybe a closer read of the original question is needed here. This answer
aint gonna help. He's got a 12v AC plugpack, but wants to run the camera
from a 12DC source (actually, a car battery I suspect).
 
B

Brenden Ede

Jan 1, 1970
0
Lentildude,
Probably the AC is used to generate the negative bias for
the camera IC thus a square wave drive will be fine.

I would suggest a small microcontroller driving a H bridge circuit.

A PICAXE chip should be cheap and easy to program to generate a 50Hz
signal on 2 different output lines.

If accuracy is required then a 32KHz watch crystal could be used to
stabilise the frequency, but a firmware program would have to be written
and burned to the chip with a PIC programmer.

Several different H bridge circuits can be found at

http://library.solarbotics.net/circuits/driver_tilden.html

I hope that this helps.

Regards,
Brenden Ede
 
F

Franc Zabkar

Jan 1, 1970
0
I was looking at inverter circuits, I would need 12vac at 1 amp but
would need to be efficient to not
drain car battery. If you have any links to any simple low cost
circuits, most appreciated

BTW

Here is a look inside the 2100
http://www.alttokyo.com/Jauction/2100.JPG
I took a hires picture, you can see a little of the powersupply input
circuitry.

See http://www.axis.com/products/cam_2100/2100to.htm#hard

The AXIS 2100 consists of:

Power connector (12 V AC or DC, 9.6 VA), Axis PS-D
^^

- Franc Zabkar
 
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