Ninehigh
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| posted on 30/4/12 at 03:18 PM |
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Quick electrical one
I have a small speaker powered by 3 AAA batteries, now if I was to solder each terminal up to a D cell battery it would last longer right? My thinking
is that the larger cell holds more amp hours (or kilowatt hours etc) than a AAA.
Am I right?
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MikeFellows
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| posted on 30/4/12 at 03:25 PM |
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but surely the 3 AAA give 4.5v to the speaker where as one D would only give 1.5v?
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ReMan
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| posted on 30/4/12 at 03:34 PM |
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Yes it will last for ever
Edited to add, I was wrong, I was remembering D as this one
http://www.conrad-uk.com/ce/en/product/650802/High-Energy-45V-flat-battery
D is indeed 1.5 and you need 3, then they will last forever 
[Edited on 30/4/12 by ReMan]
www.plusnine.co.uk
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owelly
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| posted on 30/4/12 at 03:35 PM |
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AA, AAA C and D are all 1.5volt
http://www.ppcmag.co.uk
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scudderfish
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| posted on 30/4/12 at 03:38 PM |
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Short answer, yes.
http://en.wikipedia.org/wiki/D_battery#Dimensions_and_capacity
vs.
http://en.wikipedia.org/wiki/AAA_battery
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Ninehigh
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| posted on 30/4/12 at 03:39 PM |
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Sorry yes it would be three D batteries too in order to keep the same voltage
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MikeFellows
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| posted on 30/4/12 at 03:40 PM |
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both those articles list the batteries at 1.5v
if the AAA batteries are inline they will be running 4.5v (if parallel then 1.5v but ive never seen anything run parallel)
a single D battery will not be enough to power the speaker
eta:
oh you meant 3 - yes this is fine
[Edited on 30/4/12 by MikeFellows]
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Ninehigh
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| posted on 30/4/12 at 03:50 PM |
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Thanks guys, now to go find some d-cell holders
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cliftyhanger
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| posted on 30/4/12 at 04:21 PM |
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However.....check the capacity of the batteries. Many of the small batteries, especially rechargables, have equal or better capacity to the larger,
less used types.
However, AAA are small and therefore tend to be low, but have a peek at AA size, you may be surprised!
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ReMan
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| posted on 30/4/12 at 04:26 PM |
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quote:
Originally posted by Ninehigh
Thanks guys, now to go find some d-cell holders
either that or a.n. otehr alternative.
I presume a mains adaptor is not possible?
www.plusnine.co.uk
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MikeRJ
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| posted on 30/4/12 at 05:47 PM |
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quote:
Originally posted by cliftyhanger
However.....check the capacity of the batteries. Many of the small batteries, especially rechargables, have equal or better capacity to the larger,
less used types.
However, AAA are small and therefore tend to be low, but have a peek at AA size, you may be surprised!
Plenty of rechargeable C and D cells are simply AA cells with a plastic sleeve around them!
You'd probably be surprised at the capacity of good Alkaline D cells; at reasonably low current drains (<500mA) they can have well over 15
Ah.
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Ninehigh
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| posted on 30/4/12 at 07:53 PM |
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quote:
Originally posted by ReMan
quote:
Originally posted by Ninehigh
Thanks guys, now to go find some d-cell holders
either that or a.n. otehr alternative.
I presume a mains adaptor is not possible?
Not really, it's a portable speaker.. I use it a lot in the car and such plugged into my phone (the car radio is a pita with the plugs)
I'm just thinking it would be cheaper overall to use larger batteries, as there's room in the housing for it.
I'll have a look for the mah numbers
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Peteff
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| posted on 1/5/12 at 08:56 AM |
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Get a car accessory phone charger to plug into the lighter, the USB type will do it. They run about 5v which should work.
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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Ninehigh
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| posted on 4/7/12 at 08:11 PM |
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Another one!
I've got the holders, but the spring from one negative terminal is connected by the positive terminal from the other battery (so both batteries
are in series)
Will I have to break that connection? It looks like the original set up is parallel, so I'm not sure if I could get away with running a 3 sets
of wires if one of them is also going to be connected in series
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