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6 Volts - 7 volts

raymondht

Apr 26, 2010
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Hello, just want to ask if we can increase 6V to 7.2V by just adding somthing..:D
 

(*steve*)

¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
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Jan 21, 2010
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another battery?
 

davenn

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Sep 5, 2009
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hahaha good responses steve and Mitchekj :D

but in all seriousness, raymondht, we need a bit more info from you of the circuit involved

If for example the cct in question was being supplied via a 7806 voltage regulator, the
input to the regulator is likely to be ~ 10 - 12V and yes with a couple of resistors
you can jack up the output of the regulator a bit ( up to a couple of volts or so)
is being supplied from say a 6V battery then not much you could do and still keep the
current ratings.
There are voltage multiplier ccts, and I have used voltage doublers, but current supplied
is the big sacrifice

cheers
Dave
VK2TDN
 
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ElectronWorks

Aug 20, 2009
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or failing that, try Googling 'boost converter' These circuits use the back emf of an inductor to boost the voltage. They are used in pretty much all portable devices from laptops to mobile phones
 

raymondht

Apr 26, 2010
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its a battery lead acid battery, its only 6V, but my device needs 7.2v...
 

55pilot

Feb 23, 2010
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What exactly is your device? How much current does it need?

---55p
 

davenn

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Its a hand held video camera. JVC Everio

ok forget the 6V battery, get a 12V sealed lead acid or similar battery and use a voltage regulator to produce the required voltage needed for the video cam there are a number of good hi current adjustible V-regs out there that would be able to handle the current required by your camera eg ... my favourite the LM338 5 Amp TO-3 casing
I have used for so many projects over the years

with a 6V battery and using any sort of boost converter is going to run into probs
as the battery drops in voltage out as it discharges.

with a 12V battery you are going to have several volts of discharge "headroom" without
affecting the output of the regulator.

cheers
Dave
VK2TDN
 

55pilot

Feb 23, 2010
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Using a linear regulator to go from 12V to 7.2V, you are wasting 40% of power. If the 12V was coming from a wall outlet, that would not be a big deal. But if it is coming from a battery that you need to lug around, it does become a big deal. A 12V to 7.2V step down DC-DC converter, or a 6V to 7.2V step up DC-DC converter is more appropriate (in that order).

But for some people, a linear regulator is the extent of their capabilities.

---55p
 
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raymondht

Apr 26, 2010
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problem is 12V lead acid is huge!... its like 5in wide 4in ht and 2in thick and its heavy While 6V half of it.
 

(*steve*)

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problem is 12V lead acid is huge!... its like 5in wide 4in ht and 2in thick and its heavy While 6V half of it.

Lead acid batteries come in all shapes and sizes. It's almost certain that you can get a 12V lead acid battery that is very close to the size, shape, and weight of the 6V one.
 

raymondht

Apr 26, 2010
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oh isee ok i'll check if theairs available lead acid 12 v small size... by the way what type of charger I cam use... Can I use my regular charger?
 

(*steve*)

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No, not necessarily higher, just appropriate.

If it's a 1.3Ah battery, then you need a charger that can charge this capacity. Say 1 to 7 Ah. A charger suited for 20 to 200 Ah would NOT be appropriate.
 
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