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Old 04-25-2005, 12:35 PM   #1
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Making a battery powered device work with an AC/DC adapter?


I have a small vault that is powered by 8 AA batteries. The vault's documentation says that the batteries are supposed to last for a year under most circumstances, but I have found that they last far less than that. Where I have the vault located, it is diffucult to use the key to open it when the batteries fail.

The manufacturer also sells a model that can be plugged into the wall after purchasing an optional AC/DC power supply from Radio Shack (P/N 273-1680-positive tip polarity with 12VDC).

The manual I have is a universal one, and it covers the vault with the AC/DC adapter as well, which is how I have the part number and such. It states for that vault that Batteries must be installed as well, and not to operate it on the external power alone.

My hope is that I can somehow convert my vault (which only has the 8 AA batteries) to accept the AC/DC adapter. I didn't realize that the batteries don't last that long until I had had the vault for a while, so I can't return it to the vendor for an exchange. I also don't want to shell out the money to purchase an additional vault, since i already have this one. Can any of you tell me how to convert this if it is possible?

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Old 04-26-2005, 10:01 AM   #2
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Making a battery powered device work with an AC/DC adapter?


You should be able to hook up a 12v outout adapter to the battery compartment and be fine. 8 AA batts = 12 VDC. Some people make "dummy" batts out of dowel rods and hook the adapter to the ends of it and close it all up. I have done this when building trail cameras for wildlife.

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Old 05-12-2005, 03:02 PM   #3
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Making a battery powered device work with an AC/DC adapter?


Is there a way to make it work so that the batteries act as a backup in case of a power failure? (So as to not have the combination reset?)
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Old 05-12-2005, 05:23 PM   #4
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Making a battery powered device work with an AC/DC adapter?


Use only rechargable batteries. Regular batteries will explode. You can also install a diode into the positive side to allow it to use the AC power and regular batteries.
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Old 11-18-2005, 06:12 PM   #5
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Making a battery powered device work with an AC/DC adapter?


I also have the same vault & the same issue with the batteries. They only last about 5-6 months. I'm going to visit my local radio shack & see if they can help. Please let me know if you find a solution.
Thanks,
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Old 11-22-2005, 11:22 AM   #6
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Making a battery powered device work with an AC/DC adapter?


I tried Radio Shack & converted from 8 (aa) batteries to 8 (D) batteries in hopes of alonger battery life,but I couldnt get it to work. I'm at the same point as you are. I either just hook up a dc to ac converter & forget about the battery backup, or i buy a new vault.
Sorry I wasnt any help.
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Old 10-25-2009, 04:10 PM   #7
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Making a battery powered device work with an AC/DC adapter?


Can I get the exact steps when converting a trail camera?
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Old 10-25-2009, 06:52 PM   #8
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Making a battery powered device work with an AC/DC adapter?


Making the batteries act as backup is a little trickier. I would not just use rechargeable batteries in parallel as they will overcharge severely and be useless.

It is possible to get a coaxial power plug that has an extra pin for battery input, so that when you unplug the AC it switches to the batteries physically. It's a little hard to explain without pictures.
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Old 10-25-2009, 08:01 PM   #9
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Making a battery powered device work with an AC/DC adapter?


Quote:
Originally Posted by Gigs View Post
Making the batteries act as backup is a little trickier. I would not just use rechargeable batteries in parallel as they will overcharge severely and be useless.

It is possible to get a coaxial power plug that has an extra pin for battery input, so that when you unplug the AC it switches to the batteries physically. It's a little hard to explain without pictures.
Why not use a DPDT Relay. When the power goes out, they'll switch over to battery power, if that's what you desire! Or a N/O relay. When the power releases the coil. it'll automatically switch over to Battery power!!! (No matter what) Don't Drink and Drive, Ever!!!
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Old 10-25-2009, 08:03 PM   #10
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Making a battery powered device work with an AC/DC adapter?


If your AC adaptor isn't loaded down to its rated current you might get 20% overvoltage. It also puts out full-wave-rectified DC, so the equipment might not like it (a battery puts out smooth DC).

What current does the vault draw?
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Old 10-25-2009, 08:20 PM   #11
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Making a battery powered device work with an AC/DC adapter?


Quote:
Originally Posted by Yoyizit View Post
If your AC adaptor isn't loaded down to its rated current you might get 20% overvoltage. It also puts out full-wave-rectified DC, so the equipment might not like it (a battery puts out smooth DC).

What current does the vault draw?
But when you add a capacitor (in parallel, 500Mf./ Maybe. I don't know what the (desired) output is) in addition to full wave rectification, you DO get a smooth DC circuit. Tried it on DC Relays. (No matter what) Don't Drink and Drive, Ever!!!
p.s: we might be admonished for getting too technical, here!
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Old 10-26-2009, 05:15 PM   #12
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Making a battery powered device work with an AC/DC adapter?


It depends on the wall wart. Some of them are straight AC, some are rectified AC, some are rectified and smoothed AC, and some are even little switching power supplies these days.
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Old 10-26-2009, 07:31 PM   #13
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Making a battery powered device work with an AC/DC adapter?


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Originally Posted by Gigs View Post
It depends on the wall wart. Some of them are straight AC, some are rectified AC, some are rectified and smoothed AC, and some are even little switching power supplies these days.
WADR. (No. these are not the initials of a Radio Station). AC when it is rectified Whether it's Half-Wave (One side of the sine wave is blocked) or Full-Wave (Both sides are rectified or blocked) is considered to be DC. But it's "Pulsating" DC. When, in addition, it's filtered, through one or a series of Capacitors, it's considered Filtered DC. When using Pulsating DC (even on DC Relays), they will vibrate, and not work smoothly. That's where the Filter Capacitor comes in.
My apologies for posting technical stuff, but it all has practical applications, for DIY'rs.
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Old 08-12-2010, 01:16 AM   #14
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Making a battery powered device work with an AC/DC adapter?


Hi, everyone. Well, I am not much of an Engineer, but I was reading the thread and curious if such adapter will work for this device:
SVP HDDV2200. It takes 3 AAA batteries. If it is possible, would you be so kind to provide me the steps on how to do it? I would like to use it for paranormal investigations. Your feedback would really help. Have a great day, afternoon, or evening.
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Old 11-21-2010, 07:28 PM   #15
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Making a battery powered device work with an AC/DC adapter?


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Originally Posted by bountyhunter View Post
You should be able to hook up a 12v outout adapter to the battery compartment and be fine. 8 AA batts = 12 VDC. Some people make "dummy" batts out of dowel rods and hook the adapter to the ends of it and close it all up. I have done this when building trail cameras for wildlife.
Do you mean "output adapter" ? Well, isn't an output adapter another way to show images or videos from a device to T.V? Well, at least that's the things I get when I Google for it, please tell me the specific name of the adapter, your way sounds interesting.

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