Archived from groups: alt.comp.periphs.dcameras (
More info?)
There is no polarity switch, you alter the plug's polarity by how the plug
connects to the cord, it has 2 identical prongs that go into 2 identical
receptacles and depending on which prong goes into which hole the polarity
of the plug is determined --- point taken, though. I'll tape it.
So, if it goes bang and fills the room with evil plastic-smelling fumes,
you'll buy me another one, right?
(joke)
I'll let you know what happens, but first I have to find a plug.
"CSM1" <nomoremail@nomail.com> wrote in message
news:KDtJd.19532$wi2.19404@newssvr11.news.prodigy.com...
> That was probably a good enough test.
>
> Since the voltage did not change from no load to half full load, the power
> supply is regulated.
> The next most important thing is to get the polarity correct.
>
> Look closely at the symbol next to the power connector on the camera, it
> should have the polarity marked.
> Use a magnifying glass to see the + or - symbol in the center of the
> semicircle.
>
> Wire a connector to the power supply that fits the camera. Make sure the
> polarity is correct for the center connector of the plug.
> Put the power supply on 3 volts and DO NOT change to any other voltage.
>
> The A400 uses 2 AA batteries, so the voltage required is 3 volts.
>
> It would be a good idea to put tape on the voltage switch, so that it does
> not get changed accidentally.
>
> Be brave, try it on the camera.
>
> If you want to buy the ACK 800 AC adapter kit, click this link. I have
> seen
> it for $30 at amazon.com.
>
http://www.google.com/froogle?q=AC+adapter+kit+ACK800+&btnG=Search+Froogle
>
> --
> CSM1
>
http://www.carlmcmillan.com
> --
> "tom" <cyberhun@shaw.ca> wrote in message
> news:WEjJd.163793$8l.10981@pd7tw1no...
>> Ok, well it looks good, actually. I found a resistor that didn't have
> color
>> bands on it, but was red, and had 4R(7 or Z couldn't tell), and +-5% on
> the
>> other side. Since it is only necessary to hook it up momentarily to a
>> low
>> voltage I wasn't that worried about heat dissipation capacity.
>> I checked the R with my multimetere and it showed exactly 4 Ohms of
>> resistance.
>> Then I set the adapter at 3V, with no load but the meter, and tested ---
> it
>> showed exactly 3V, to within a hair actually.
>> Then I put the resistor in parallel with the meter and it showed exactly
> the
>> same voltage, no perceptible drop. And I know I had good connection with
>> the resistor becaue, boy, did it ever get hot --- in the two seconds that
>> power was applied, it got too hot to touch and I could smell the 'hot
>> component' smell! No smoke, but next time I do something like this I'll
> pay
>> more attention to power ratings, I think.
>> So there doesn't seem to be a problem with the adapter supplying enough
> amps
>> to a the camera, is there any way to ensure it won't push too much?
>> No, I guess not because you said that the camera will only take what it
>> needs, right? The only potential problem was that it couldn't supply
> ENOUGH
>> amps, and the voltage would sag(if I have it right), if it wasn't
> regulated.
>> Now there's another problem with using this adapter, which is that not
> one,
>> out of the dozen or so jacks that came with the adapter, fits the DC In
>> receptacle on the camera. I'll go hunt around 2nd hand shops and see
>> what
> I
>> can find.
>>
>> How's my methodology here, guys? Am I making any glaring mistakes?
>>
>>
>>
>> "Gymmy Bob" <nothanksx@bite.me> wrote in message
>> news:BaqdnTo-ALbsKWjcRVn-pg@golden.net...
>> > Precision resirtors are printed text on the side. I believe precision
>> > resistors can be ordered custom made or from a big supplier in any
>> > value
>> > desired for not too bad a price (a few years back). The time wait for
> them
>> > is brutal though.
>> >
>> > "CSM1" <nomoremail@nomail.com> wrote in message
>> > news:btiJd.24026$iC4.15242@newssvr30.news.prodigy.com...
>> >> It has been years, I did not remember that the Gold and Silver
> multiplier
>> > is
>> >> used below 10 ohms. I though it was one ohm.
>> >>
>> >> --
>> >> CSM1
>> >>
http://www.carlmcmillan.com
>> >> --
>> >> "Gymmy Bob" <nothanksx@bite.me> wrote in message
>> >> news:idydnY4SXqGWCmjcRVn-sg@golden.net...
>> >> > Black, yellow, black isn't used in standard colour codes
>> >> >
>> >> > "CSM1" <nomoremail@nomail.com> wrote in message
>> >> > news:JrgJd.19308$wi2.2137@newssvr11.news.prodigy.com...
>> >> > > I have a 4.7 ohm 2 watt resistor.
>> >> > > The color bands are yellow,violet,gold.
>> >> > > So the bands for 4 ohms would be yellow, black,gold.
>> >> > >
>> >> > > Or they could be black,yellow,black.
>> >> > >
>> >> > > --
>> >> > > CSM1
>> >> > >
http://www.carlmcmillan.com
>> >> > > --
>> >> > > "tom" <cyberhun@shaw.ca> wrote in message
>> >> > > news:OSdJd.160478$Xk.128769@pd7tw3no...
>> >> > > > OK, I'm going to try to dig up a 4ohm resistor. Would you
>> >> > > > verify
>> > the
>> >> > > color
>> >> > > > codes?
>> >> > > > I believe for a 4 Ohm resistor, the bands would be yellow,
>> >> > > > black,
>> >> gold,
>> >> > > > brown. with the last band indicating tolerance, not that
> critical
>> > in
>> >> > this
>> >> > > > case.
>> >> > > > I don't even know if I've got one, but are those the right
>> >> > > > bands ---
>> >> > CSM1?
>> >> > > >
>> >> > > > "CSM1" <nomoremail@nomail.com> wrote in message
>> >> > > > news:HhbJd.19177$wi2.11806@newssvr11.news.prodigy.com...
>> >> > > > >I made a big miscalculation on the resistor needed to test the
>> > power
>> >> > > > > adapter. I said one watt, but the correct wattage is 10 watts.
>> >> > > > > The
>> >> > > > > resistance is 6/1.7=3.529 ohms.
>> >> > > > > (1700 ma=1.7 A)
>> >> > > > >
>> >> > > > > For a 10 watt wire wound resistor the nearest standard value
>> >> > > > > is
> 4
>> >> > ohms,
>> >> > > so
>> >> > > > > 6
>> >> > > > > V/4 ohms=1.5 or 1500 ma. 6 volts times 1.5 A = 9 watts.
>> >> > > > >
>> >> > > > > --
>> >> > > > > CSM1
>> >> > > > >
http://www.carlmcmillan.com
>> >> > > > > --
>> >> > > > > "CSM1" <nomoremail@nomail.com> wrote in message
>> >> > > > > news:0NaJd.23946$iC4.15230@newssvr30.news.prodigy.com...
>> >> > > > >> "tom" <cyberhun@shaw.ca> wrote in message
>> >> > > > >> news:fYYId.154987$8l.139015@pd7tw1no...
>> >> > > > >> > Hah! I finally found it. OK, on it it says ---
>> >> > > > >> >
>> >> > > > >> > PLUG-IN CLASS 2 TRANSFORMER
>> >> > > > >> > "MW Switching Universal Power Supply", made in China, and a
>> >> > Canadian
>> >> > > > >> > Underwriters Lab Symbol
>> >> > > > >> > Model MWS1189UC
>> >> > > > >> > Input 100V-140V, AC 60Hz, 28W
>> >> > > > >> > Output: 3, 4.5, 6, 7.5, 9, 12v DC.
>> >> > > > >> > Current 1700 mA
>> >> > > > >> >
>> >> > > > >> > -I have a voltmeter and I tested some NiMH batteries that
> were
>> >> > rated
>> >> > > at
>> >> > > > >> 1.2V
>> >> > > > >> > (much to my surprise, I had assumed they were 1.5V, but I
> got
>> >> home
>> >> > > and
>> >> > > > >> > looked at the package and it said 1.2V) right after I
> finished
>> >> > > charging
>> >> > > > >> > them, and they were in fact, only putting out 1.2V when
> hooked
>> > up
>> >> > to
>> >> > > > >> > the
>> >> > > > >> > large resistance associated with a voltmeter, when they
>> >> > > > >> > were
>> >> > > connected
>> >> > > > > to
>> >> > > > >> an
>> >> > > > >> > actual load of much lower resistance, I'm sure their V
>> >> > > > >> > would
>> >> > > > >> > be
>> >> > even
>> >> > > > >> > less --- my point in all this being that even if my adapter
> is
>> >> > rated
>> >> > > at
>> >> > > > >> > 1700mAh, don't you think the camera could handle it anyway
>> >> > > (especially
>> >> > > > > if
>> >> > > > >> I
>> >> > > > >> > turned the LCD screen brightness way down) because it
> clearly
>> > can
>> >> > > > >> > handle
>> >> > > > >> > batteries that put out significantly less than 1.5V?
> (sorry,
>> >> long
>> >> > > > >> question)
>> >> > > > >> >
>> >> > > > >> > -Does the fact that this adapter states a current at all,
>> >> indicate
>> >> > > that
>> >> > > > > it
>> >> > > > >> > is 'Regulated'?
>> >> > > > >> >
>> >> > > > >> > -A lot of these NiMH batteries have ratings like 300mAh, or
>> >> > > > >> > the
>> >> > > highest
>> >> > > > > I
>> >> > > > >> > think was 2300mAh --- does this kind of rating mean
>> >> > > > >> > basicaly
>> > that
>> >> > for
>> >> > > > > the
>> >> > > > >> > first hour of use, at the rated voltage of 1.5V, they put
> out
>> >> that
>> >> > > > > average
>> >> > > > >> > amount of current (because it would vary, wouldn't it,
>> >> > > > >> > somewhat
>> >> > > anyway
>> >> > > > > as
>> >> > > > >> > the battery depleted itself)?
>> >> > > > >> >
>> >> > > > >> > -If a NiMH battery was rated at 300mAh does that mean it
> puts
>> > out
>> >> > an
>> >> > > > >> average
>> >> > > > >> > of 300mA/hour at the rated voltage of 1.5V, over it's
>> >> > > > >> > lifetime?
>> >> > > > >> >
>> >> > > > >> >
>> >> > > > >> The Adapter may or may not be regulated, If it does not say I
>> > would
>> >> > > test
>> >> > > > > the
>> >> > > > >> adapter before using it on my digital camera.
>> >> > > > >>
>> >> > > > >> Select 6 volts, measure the power supply without a load
>> >> > > > >> (leads
>> >> open),
>> >> > > > >> note
>> >> > > > >> the voltage (it must be 6 volts +- 5%).
>> >> > > > >>
>> >> > > > >> To put a 1700 mA load at 6 volts you would need a 35.29 ohm
>> >> resistor,
>> >> > > but
>> >> > > > >> since the closest standard value is 36 ohms, use a 36 ohm,
>> >> > > > >> one
>> > watt
>> >> > or
>> >> > > > > more
>> >> > > > >> resistor. The resistor will get very warm (hot to the touch).
>> >> > > > >> Put
>> >> > power
>> >> > > > >> supply and the volt meter across the resistor to see if the
>> > voltage
>> >> > > stays
>> >> > > > > at
>> >> > > > >> 6 volts. If the voltage does not drop more than 5%, it is
>> > regulated
>> >> > and
>> >> > > > > safe
>> >> > > > >> to use on a digital camera. (5% drop from 6 volts = 5.7
>> >> > > > >> volts)
>> >> > > > >>
>> >> > > > >> However 1700 ma is very close to the minimum current capacity
>> >> > > > >> for
>> >> > > > > supplying
>> >> > > > >> a digital camera. Not using the LCD will conserve the most
>> >> > > > >> power.
>> >> If
>> >> > > > >> there
>> >> > > > >> is an optical viewfinder, use that to frame the picture. Be
>> >> > > conservative
>> >> > > > >> with flash use also.
>> >> > > > >>
>> >> > > > >> On NiMH batteries, when fully charged the voltage is about
>> > 1.3-1.4
>> >> > > volts
>> >> > > > > no
>> >> > > > >> load.
>> >> > > > >> Nominal voltage is 1.25 volts. (they get better with some
>> >> > > > >> use)
>> >> > > > >>
>> >> > > > >> The MaH rating is based on supplying the rated current for
>> >> > > > >> one
>> > hour
>> >> > > > >> before
>> >> > > > >> dropping to some stated minimum voltage (around 1 volt).
>> >> > > > >>
>> >> > > > >> A fully charged 300 mah battery with supply 300 ma for one
> hour
>> >> until
>> >> > > the
>> >> > > > >> voltage is around 1 volt. (It would keep outputting some
> current
>> >> > until
>> >> > > > >> the
>> >> > > > >> battery is dead). Digital Cameras have a power protection
>> > built-in
>> >> > that
>> >> > > > >> shuts down the camera at some minimum voltage.
>> >> > > > >>
>> >> > > > >> You want the highest Mah rating you can find for the best
> price.
>> >> The
>> >> > > > > higher
>> >> > > > >> the Mah the longer the batteries will operate the camera. For
>> >> Digital
>> >> > > > >> cameras, the minimum I would use is 1600 Mah.
>> >> > > > >>
>> >> > > > >> --
>> >> > > > >> CSM1
>> >> > > > >>
http://www.carlmcmillan.com
>> >> > > > >> --
>> >> > > > >>
>> >> > > > >
>> >> > > >
>> >> > > >
>> >> > >
>> >> >
>> >> >
>> >>
>> >
>> >
>>
>>
>
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