UP conveting 7.2V to 9.0V

CiPO

CiPO

Well-known member
HI

I was hoping to use my ZoomH4 powered with some SONY/Canon Li-ion packs I got. The H4 works at 9V while the batteries are at 7.2V.
I could put 2x7.2V in series and get 14.4V which is easier to down convert to 9V. But given the little current needed I was hoping to up convert the 7.2V to 9.0V directly from one single 7.2V pack.
Any help ? Any link to some device ? Comment ?
Could not find anything myself yet :)
THX
 
Last edited:
teddybear said:
CiPO

What type of batteries are you currently using? I also have a zoom.
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I would like to use some SONY NP-FP90 or the a canon (T2i). I just thought I would create some power source for the H4 sharing some battery I got or new I will buy (for the T2i) :)
 
Richard Crowley said:
Is there a rated voltage range for the Zoom? Have you tried to see if it runs on 7.2V? Many modern products run on a rather broad range of supply voltages because they do their own conversion to the voltage(s) they use internally.
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That was my original idea but didn't find anything on the ZOOM page. They only report 9V, will check better :)

If you really need to up-convert the voltage this little chip is pretty nice.
http://www.sparkfun.com/commerce/product_info.php?products_id=317
Click to expand...

Sweet !!! that's the component I would need. I have to check if I can find some ready made circuit with it or simply use the one proposed in the PDF. I need to go thourgh all the values there and make my own calculation :)
THX !
 
When I first got my zoom, I almost got disappointed when its sucks in a few minutes alkaline batteries i placed on it. However, someone advised me to use Hi powered rechargable batteries usually used for photo flashes.
I got a couple of NiMh 2500mAh Kodak branded batteries. Now i seldom replace my batteriess during a shoot.
I also use same batteries for my portable LED lights. They last a long time.
They also charge fast.

GP batteries are also good.
 
From the manual: "Power supplies
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[SIZE=-1]Thanks to its circuit design optimized for low voltage operation, the H4 can record continuously for about four hours on a pair of AA batteries. The supplied AC adaptor (AD-0006) can be plugged in for extended use. When using the H4 as an SD card reader or USB audio interface, it can be powered via USB. [/SIZE][SIZE=-2]Power Requirements: AA size (LR6) battery x 2, or Supplied AC adaptor AD-0006 (DC9V/300mA/center minus type) [/SIZE]"

This means the device could run on much lower Voltage then the 9V from the power supply ! :)
Probably the 7.2V vould be good enough :) But two alcaline AA are basically only 3V !! WOW, it can run on such large Voltage range ?? !
 
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