From: David Nebenzahl on
On 3/8/2010 9:21 PM chrisj.doran(a)proemail.co.uk spake thus:

> 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).

Yes, I thought I'd already written that in this thread, possibly more
than once: it takes 3 volts (and says it uses 2.5 watts), and has the
polarity marked. So I figure a 1 amp power supply would be about right.

I'm tending to believe that 3.3 volts will be just fine, but maybe I'll
wait for more confirmation (or not).

Oh, and I don't intend to use the camera tethered to a power cord: I'd
like to use the external power supply to transfer pictures to my
computer, to save the batteries.


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

- a Usenet "apology"
From: Thomas Tornblom on
David Nebenzahl <nobody(a)but.us.chickens> writes:

> On 3/8/2010 4:51 PM tm spake thus:
>
....
>
> 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.)

Two alkaline AA cells will provide around 3.2V when new. I'm positive
it will work just fine on 3.3V.

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

Nope.

>
> 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"
--
Real life: Thomas T�rnblom Email: Thomas.Tornblom(a)Hax.SE
Snail mail: Banvallsv�gen 14 Phone: +46 18 444 33 21
S - 754 40 Uppsala, Sweden Cellular: +46 70 261 1372
From: David Nebenzahl on
On 3/8/2010 11:17 PM Thomas Tornblom spake thus:

> David Nebenzahl <nobody(a)but.us.chickens> writes:
>
>> 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.)
>
> Two alkaline AA cells will provide around 3.2V when new. I'm positive
> it will work just fine on 3.3V.
>
>> So do you think 3.3 volts is going to bother it?
>
> Nope.

Thank you. I think that increases my confidence level to somewhere
around 97.3%.


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

- a Usenet "apology"
From: Arfa Daily on

"David Nebenzahl" <nobody(a)but.us.chickens> wrote in message
news:4b95dcc5$0$2355$822641b3(a)news.adtechcomputers.com...
> On 3/8/2010 9:21 PM chrisj.doran(a)proemail.co.uk spake thus:
>
>> On 9 Mar, 00:20, David Nebenzahl <nob...(a)but.us.chickens> wrote:
> >
>>> I'm wondering if running a 3-volt device (cheap digital camera) on 3.3
>>> volts will hurt it. Yeah, I coulda gotten a 3-volt wall wart to run it,
>>> but it was expen$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).
>
> Yes, I thought I'd already written that in this thread, possibly more than
> once: it takes 3 volts (and says it uses 2.5 watts), and has the polarity
> marked. So I figure a 1 amp power supply would be about right.
>
> I'm tending to believe that 3.3 volts will be just fine, but maybe I'll
> wait for more confirmation (or not).
>
> Oh, and I don't intend to use the camera tethered to a power cord: I'd
> like to use the external power supply to transfer pictures to my computer,
> to save the batteries.
>
>
> --
> You were wrong, and I'm man enough to admit it.
>
> - a Usenet "apology"

There's nothing wrong with the diode route to drop the voltage by a
(reasonably) constant amount, but just use a Schottky type, which will have
a forward voltage drop of around 0.3 to 0.4v - or just about what you're
looking for ...

Arfa


From: David Nebenzahl on
On 3/10/2010 9:48 AM Arfa Daily spake thus:

>>> 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.
>
> There's nothing wrong with the diode route to drop the voltage by a
> (reasonably) constant amount, but just use a Schottky type, which will have
> a forward voltage drop of around 0.3 to 0.4v - or just about what you're
> looking for ...

Can they handle the current (~ 1A)?

In any case, I'm reasonably sure that I can run the camera on the 3.3
volts without fear of damage.


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

- a Usenet "apology"
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