3.3V on a 3V device?
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From: David Nebenzahl on 9 Mar 2010 00:35 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 9 Mar 2010 02:17 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 9 Mar 2010 03:54 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 10 Mar 2010 12:48 "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 10 Mar 2010 13:35 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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