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From: tm on 8 Mar 2010 19:51

"David Nebenzahl" <nobody(a)but.us.chickens> wrote in message
news:4b9584de$0$2377$822641b3(a)news.adtechcomputers.com...
> I'm wondering if running a 3-volt device (cheap digital camera) on 3.3
> volts will hurt it. Yeah, I coulda gotten a 3-volt wall wart to run it,
> but it was expen$ive. The 3.3V regulator I got was a little more than a
> buck. Haven't tried it yet.
>
> What say the experts here?
>
> (I also thought about bringing the voltage down to 3 volts with a 0.36 ohm
> resistor, or maybe a couple diodes in parallel: need to drop 0.3 volts,
> and the camera draws 2.5 watts [0.86A), so 0.3/0.86 = 0.36 ohms. Maybe 3
> 1N4001s in parallel?)
>


Does the 3 volt number come from the fact that the camera runs on two AA
batteries? If it will work with the Li AA 1.7 volt cells, then you should be
ok up to 3.4 volts at least.

Tom


From: David Nebenzahl on 8 Mar 2010 20:07
On 3/8/2010 4:51 PM tm spake thus:

> "David Nebenzahl" <nobody(a)but.us.chickens> wrote in message
> news:4b9584de$0$2377$822641b3(a)news.adtechcomputers.com...
>
>> I'm wondering if running a 3-volt device (cheap digital camera) on 3.3
>> volts will hurt it. Yeah, I coulda gotten a 3-volt wall wart to run it,
>> but it was expen$ive. The 3.3V regulator I got was a little more than a
>> buck. Haven't tried it yet.
>>
>> What say the experts here?
>>
>> (I also thought about bringing the voltage down to 3 volts with a 0.36 ohm
>> resistor, or maybe a couple diodes in parallel: need to drop 0.3 volts,
>> and the camera draws 2.5 watts [0.86A), so 0.3/0.86 = 0.36 ohms. Maybe 3
>> 1N4001s in parallel?)
>
> Does the 3 volt number come from the fact that the camera runs on two AA
> batteries? If it will work with the Li AA 1.7 volt cells, then you should be
> ok up to 3.4 volts at least.

The instructions with camera (a Fuji Finepix A205 that I got for $1)
specify either alkaline (LR6) or rechargable NH-10 AA cells; since this
camera is, what, about 6 years old? I don't think it was made to use LI
cells. So it's probably expecting about exactly 3 volts. (The external
power jack is marked 3V at 2.5W.)

So do you think 3.3 volts is going to bother it?

To the previous confused respondents to this query, I don't have a wall
wart. I was looking at buying a 3-volt one (not 3.3 volts; that's the
voltage regulator I have), but I didn't because, well, I only paid $1
for the camera (it works) and I'm a cheap SOB.


--
You were wrong, and I'm man enough to admit it.

- a Usenet "apology"
From: William Sommerwerck on 8 Mar 2010 21:03
How many rechargeable cells does it take? Two? Then it should work properly
on two NiMH cells.

Why don't you just use high-capacity rechargeable cells -- which you
doubtless already own -- to power it? Are you going to be trailing a power
cord?

---- The Lady from Philadelphia


From: tm on 8 Mar 2010 22:28

"David Nebenzahl" <nobody(a)but.us.chickens> wrote in message
news:4b959e0c$0$2381$822641b3(a)news.adtechcomputers.com...
> On 3/8/2010 4:51 PM tm spake thus:
>
>> "David Nebenzahl" <nobody(a)but.us.chickens> wrote in message
>> news:4b9584de$0$2377$822641b3(a)news.adtechcomputers.com...
> >
>>> I'm wondering if running a 3-volt device (cheap digital camera) on 3.3
>>> volts will hurt it. Yeah, I coulda gotten a 3-volt wall wart to run it,
>>> but it was expen$ive. The 3.3V regulator I got was a little more than a
>>> buck. Haven't tried it yet.
>>>
>>> What say the experts here?
>>>
>>> (I also thought about bringing the voltage down to 3 volts with a 0.36
>>> ohm resistor, or maybe a couple diodes in parallel: need to drop 0.3
>>> volts, and the camera draws 2.5 watts [0.86A), so 0.3/0.86 = 0.36 ohms.
>>> Maybe 3 1N4001s in parallel?)
>>
>> Does the 3 volt number come from the fact that the camera runs on two AA
>> batteries? If it will work with the Li AA 1.7 volt cells, then you should
>> be ok up to 3.4 volts at least.
>
> The instructions with camera (a Fuji Finepix A205 that I got for $1)
> specify either alkaline (LR6) or rechargable NH-10 AA cells; since this
> camera is, what, about 6 years old? I don't think it was made to use LI
> cells. So it's probably expecting about exactly 3 volts. (The external
> power jack is marked 3V at 2.5W.)
>
> So do you think 3.3 volts is going to bother it?
>
> To the previous confused respondents to this query, I don't have a wall
> wart. I was looking at buying a 3-volt one (not 3.3 volts; that's the
> voltage regulator I have), but I didn't because, well, I only paid $1 for
> the camera (it works) and I'm a cheap SOB.
>

Well, if it will run off of two nicads, that is only 2.4 volts nominal. So,
it
shouldn't hurt to put one 1N4001 in series with the 3.3 volt supply and
drop it down to about 2.6 volts. That would be the same as two charged
nicads at 1.3 volts each.

Tom





From: chrisj.doran on 9 Mar 2010 00:21
On 9 Mar, 00:20, David Nebenzahl <nob...(a)but.us.chickens> wrote:
> I'm wondering if running a 3-volt device (cheap digital camera) on 3.3
> volts will hurt it. Yeah, I coulda gotten a 3-volt wall wart to run it,
> but it was expen$ive. The 3.3V regulator I got was a little more than a
> buck. Haven't tried it yet.

The fact that the camera uses two cells doesn't mean that it requires
a 3V external supply. My old DC215 which uses 4 cells won't work off a
6V battery plugged into the power socket -- the external PSU is 7.5V.
There is presumably an internal regulator.

Conversely, some cameras do _not_ have any internal regulation and
expect a stabilised supply. But as Sjouke says, cheap wallwarts may
not be stabilised and the voltage can rise alarmingly on low loads.
People trying to avoid buying the manufacturer's expensive PSU have
been known to destroy their cameras.

Is the required voltage (and polarity) given on the camera, probably
near the socket? Or tell us the model and someone may know
(rec.photo.digital may be a better place to ask).

You may be able to get the correct PSU secondhand on eBay from someone
with a dead camera (as long as they didn't kill it as above :-).

Chris
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