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Henry
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, December 30, 2004 - 08:26 pm: | 
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Have any of you made a power unit to power a camera during test...so as not to continually be buying batteries? I've looked at some variable power units on ebay but don't want to spend much money.
But being a guy with three cell phones in the family...meaning lots of old/junk chargers lying around. Was wondering if a cheapie power unit might be possible.
Anyone try this?
Henry |
Haig Hovaness
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, December 31, 2004 - 10:27 pm: |
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An inexpensive solution is to use a battery holder from Radio Shack and AA, C, or D batteries. If you need to match the voltage of mercury cells, you can buy an adjustable power supply on eBay, or you can just run down alkaline cells until they are at the reduced voltage of mercury cells (1.35V). |
Ernesto J. L´Episcopo
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, January 01, 2005 - 04:39 pm: |
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Henry: it is possible to build a simple and almost inexpensive power supply that can go down as low as 1,25V at a maximum current of up to 5 A (with a suitable heat sink)using an IC manufactured by National Semiconductor, the LM 338 K. The schematics can be found in the website of NS and it would cost about USD 60 / 80 including stepdown transformer and a suitable cabinet. Just take a look at www.nsc.com where the data sheet of the IC can be found. A technician would charge something to the parts cost for assembly of the parts and give also some kind of warranty. Need more help? just email me!. Besides, I wish you all a nice and good 2005! |
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