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The Projects Forum Working on an electronics project and would like some suggestions, help or critiques? If you would like to comment or assist others with their projects, this is the place to do it.

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Old 03-10-2013, 04:44 PM
RodneyB RodneyB is offline
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Default 1.5 Volt AA Battery Charger

I am wanting to build a Battery charger for a 1.5 volt AA Battery. Can any one assist with a circuit diagram.

Best wishes

Rodney
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Old 03-10-2013, 04:55 PM
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Papabravo Papabravo is offline
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Generally speaking they cannot be recharged. NiMH batteries at 1.2 Volts may be rechargeable, and the charger at Radio shack is $9.95. Carbon-Zinc and alkaline cells are not.
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Old 03-10-2013, 05:12 PM
RodneyB RodneyB is offline
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So then it would be better to put two 1.2 Volt batteries in Parallel getting 2.4 Volts then Regullllate them down to 1.5 Volts. I still need the circuit of the charger as I want to build it as its housed in a special box with a PCB driving other circuits as well.
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Old 03-10-2013, 09:16 PM
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antonv antonv is offline
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Putting them in series gets you 2.4V.

What kind of batteries are they? (Alkaline, carbon-zinc, NiCd, NiMH?)
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Old 03-11-2013, 03:54 PM
RodneyB RodneyB is offline
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I would be putting the 2 x 1.2 Volt NICAD batteries in series to get the 2.4 Volts then I will regulate it Down to 1.5 Volts, I am driving a clock which needs 1.5 Volts. So I am going to need to charge the batteries at 2.4 Volts then regulate to 1.5 Volts. The low drop out voltage regulator is the next challange
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Old 03-11-2013, 05:31 PM
davebee davebee is offline
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Do you have any idea what voltage range the clock will run from?

If it was designed for 1.5 volt alkaline cells, it may be able to run from 1.2 volts directly, since alkaline voltages run down past 1.2 volts as they discharge.
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Old 03-12-2013, 05:54 AM
NFA Fabrication NFA Fabrication is offline
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Quote:
Originally Posted by davebee View Post
Do you have any idea what voltage range the clock will run from?

If it was designed for 1.5 volt alkaline cells, it may be able to run from 1.2 volts directly, since alkaline voltages run down past 1.2 volts as they discharge.
This guy beat me to what I was gonna say. Any more details on exactly what you are trying to do? I see more and more issues with getting answers to posts around here because the OP is trying to "Simplify" the explanation thinking they are making it easier to answer...
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