Re: TI-H: Re: Voltage at 4.4v ???
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Re: TI-H: Re: Voltage at 4.4v ???
At 08:46 AM 8/17/97 -0400, you wrote:
>Richard Piotter wrote:
>
>> I use duracels only because of the massive power they throw out. No
>> rechargable, not even alkalines put out duracel power. I don't want to
>> cause a fuss, but I have tested battery runtime and power and duracel
>> beat everything. I probably got those 5v readings because of the power a
>> duracel puts out. Rechargables only run at 1.2 volts, not 1.5 like a
>> high power alkaline. That low recharable power may be going low enough
>> for the drop out voltage to kick in. That is probably why you have a low
>> current.
>
>Welp, I'll warn you now... I'm gonna be pretty nasty about this post.
>;-|
>
>Either my messages aren't getting out... or none of you are reading
>them.
>So it looks like I get to explain this again. Either that, or you should
>go pick up a cheap Electronics 101 book and learn the basics first.
>
>That drop out voltage doesn't ever "kick in" -- It is ALWAYS present. I
>don't
>care if you're powering the regulator with 35 volts at 280 amps or 9
>volts
>at 50 mA... the regulator will ALWAYS drop its drop out voltage (The
>drop out
>voltage itself will vary based on current draw on the regulator,
>however)
>So essentially using your beloved Duracells doesn't make any damned
>difference.
>If your duracells are only putting out 6V, it still isn't any good. I
>think
>you are confusing "power" and "voltage" -- Power is essentially V*A
>(Watts
>are a unit of power) and voltage is a measurment of the difference in
>electron potential. In any case, battery "power" is not the word for
>what you're trying to describe.. you are measuring power/time ...
>I.E. the amount of time the battery lasts.
>
>Additionally, you are incorrect in your description of Duracells.
>Duracells
>-=ARE=- Alkaline batteries, just like the pink bunny batts. The
>differences
>between the batteries are fairly minor and you simply cannot compare
>them
>since you have no idea how long each of the batts you tested was on the
>store shelf. Additionally... MOST batteries are renewable -- Its just
>that
>normal alkalines do not recharge well at all. NiCds are specialized for
>being rechargable... NiMH are ever better than NiCds. The renewables are
>probably alkalines that are just modified slightly to make them take a
>charge
>better. Personally, I don't think the renewables are worth the cardboard
>they
>come in.
>
>Additionally, 5 NiCd cells are usually combined to make a 6 volt pack --
>But when fully charged this pack may measure as much as 8 volts. The
>NiCds
>when fully charged are usually at at least 1.5 volts.. The problem is
>that
>the NiCd discharge curve is much different from the Alkaline discharge
>curve. Thus, the pack is at 6 volts after only a few minutes of use. In
>any
>case, you simply cannot feed a 7805 with 6 volts! It just doesn't
>freaking
>work!!!!!
>
>I don't care if you ARE getting 5 volts out of a 7805 with your
>duracells...
>that 5 volts is at no LOAD (your DMM is extremely high impedence) I'm
>betting
>that with your cartridges in there that voltage would go down to 4.5 or
>more..
>and God knows what when you started producing switching noise.
>
>> I still agree with the data though, switch to the National VR.
>
>Well, thank God... that's what saved you from my flaming wrath. ;-)
>
>> Also, duracells are great with the SPinTerface port.
>
>As are any battery...
>
>BTW, thanks for taking that damned 12 line "R" out of your sig. I've
>always
>thought that large sigs are the poster's attempt to make up for a lack
>of
>size elsewhere.... ;-)
oh no you didnt!!!!
:)
hahahah
>Bryan Rittmeyer
>bryanr@flash.net
>
>
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