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picking the right power supply

  • Thread starter light green clock
  • Start date
L

light green clock

Jan 1, 1970
0
Hello,

I have a mini spy camera that I want to use to watch my home. But, it
did not come with a power supply. The documentation states that the
"Supply Voltate/consumed power" is 6-12V 120W.

Looking through my stuff I have found an extra power supply that is
9VDC and 140mA.

I have looked up the formula as being Watts = Amps x Volts.

My Camera:
120 Watts = 13.33 Amps x 9 Volts

My Power Supply:
1.26 Watts = .14 Amps x 9 Volts

Did I do this correctly? Will this work for my camera, without
burning it up?

Thanks!
 
Y

Yukio YANO

Jan 1, 1970
0
light said:
Hello,

I have a mini spy camera that I want to use to watch my home. But, it
did not come with a power supply. The documentation states that the
"Supply Voltate/consumed power" is 6-12V 120W.

A MINI spy camera that requires 120 Watts of POWER !!!

That can't be right ! a VHS Camcorder probably uses less than 12 Watts
I would not be surprised if a "mini spy camera" used 120 milliwatts

you might consider a solar panel and rechargeable battery for under
fifty dollars !

Yukio YANO
 
L

light green clock

Jan 1, 1970
0
Yuki YANO,

Thanks for your reply. Let me type in exactly what I see on the
product description sheet.

Supply voltage/consumed power: 6-12 v120W

So, this might be a misprint? There are other spelling mistakes in
the product description...so maybe that should read , "120mW"?? The
same product description sheet also describes a black and white model
as using 90mW. (My camera is color)

The mini camera also came with an adapter that allows me to power it
by a 9V battery. Could this help me determine if my power supply
could work for this?

Remember, the power supply I found around the house is 1.26 Watts = .
14 Amps x 9 Volts.

I really appreciate the help!
 
Yuki YANO,

Thanks for your reply. Let me type in exactly what I see on the
product description sheet.

Supply voltage/consumed power: 6-12 v120W

So, this might be a misprint? There are other spelling mistakes in
the product description...so maybe that should read , "120mW"?? The
same product description sheet also describes a black and white model
as using 90mW. (My camera is color)

The mini camera also came with an adapter that allows me to power it
by a 9V battery. Could this help me determine if my power supply
could work for this?

Remember, the power supply I found around the house is 1.26 Watts = .
14 Amps x 9 Volts.

I really appreciate the help!

Ya, A laptop, with all your goodies running... even with usb powered
cameras, mouses, lights etc.. under a full load.... won't even rise
above 90 Watts.

Your reading it wrong or there is a misprint. Try the 9 volt battery
first and see what happens... That battery won't be able to supply
much current.. much much less then 120 W's for sure.... so I'm sure
you won't burn it out. Actually, your voltage is really what matters
anyways, your device will try and pull the current it needs.. until it
reaches the psu limit. If it can't pull enough current from the psu,
then it won't turn on. In that case, get a bigger psu and try that. In
fact, you could just hook it up to your car battery if it can handle
12v. Then take a amp gage, and measure how much it needs to run...
vola, you now know what psu specs you need for current.

Anyways, long story short, don't use ac at that voltage unless you use
a rectifier. then you can.
 
L

light green clock

Jan 1, 1970
0
CWatters,

Thanks for your reply. I was looking over the package that the camera
came in and discovered that the documentation inside the box
contradicts what the outside of the box states(in Chinese).

120mW it must be.

For what it's worth, I have plugged the adapter into the camera and it
seems to work fine. I only did that for 15 seconds or so...I didn't
want to ruin the camera.

Anyway, your comment about polarity has me wondering...

I read about polarity here: http://www.accesscomms.com.au/reference/polarity.htm
My power supply is Center Positive, but I can't find any information
about polarity for my mini camera.

Is there some way to determine what the polarity for my camera is?
Would this involve a multimeter? Or some similar device?

Thanks!
 
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