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rathaleng
Joined: 04 Sep 2008
Posts: 5
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 03 Oct 2008 10:35 wanted to charge a 5v 0.9amp battery |
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| hi all i am a student of electrical engineering. i have a phone which its adaptor labled 5v 0.9amp. i want to charge the battery from 12v. i mean i want you all to help me to convert 12v to 5v dc 0.9amp.
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grittinjames
Joined: 01 Jun 2006
Posts: 380
Helped: 7
Location: bangalore india
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| 03 Oct 2008 12:44 wanted to charge a 5v 0.9amp battery |
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hi,
I hope a 7805 will solve your issue?
Thanks
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vaibhav.k
Joined: 12 Apr 2006
Posts: 85
Helped: 6
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| 03 Oct 2008 13:52 wanted to charge a 5v 0.9amp battery |
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| Put 7805 with TO220 package.Also put current limiting resistor in between resistor.Ideal charging voltage for battery is C/5. C is total capacity.
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rathaleng
Joined: 04 Sep 2008
Posts: 5
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| 06 Oct 2008 5:00 Re: wanted to charge a 5v 0.9amp battery |
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| thank you for recommendation but i used to try that one it still doesnot work. i think because of the circuit i install. i used voltmeter it points 5v but it still does not charge my phone battery and my phone also have problem of testing that charger. it does not work now.
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