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#1
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Ok, to start out, I have no idea what I'm doing. Now that' I've gotten
that out of the way, here is the plan. I just got a remote control called the OneForAll Kameleon. It's an awesome remote with one problem, it's batteries die in 1-2 weeks because of it's backlight feature which automatically turns on whenever you think about touching the controller. I don't want to give it up however, so I am going to see if I can mod it. It takes 3 AAA batteries and I am planning on putting rechargeables inside. I then will then cut into it slightly and add metal contacts which link inside of the remote to the battery poles. I'm going to build a cradle for it that has matching contacts to deliver a charge (think cordless phone). Using 3 1.2V NiMHs with 700ma capacity I know I want to be charging at 70ma. I plan on just leaving the controller there whenever I'm not using the entertainment center. Ok, here is where I point out my total lack of knowledge. I only can find AC to 4.5V DC adapters that output at 700ma, this seems like a bit much (I'm thinking exploding batteries). I know I need to knock it down to 70ma, I just don't know how. Please help me, and feel free to just make fun of me for being an idiot too. Thanks, -Fritz |
#2
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Hi,
Do you have already got some answers? I have the same problem with a Sunwave SRC-2010 remote control. The remote has a 5V connection plug so I like to charge nimh batteries with a ordinary power supply. Any thoughts if this can harm the remote? Evert Fritz wrote in message ... Ok, to start out, I have no idea what I'm doing. Now that' I've gotten that out of the way, here is the plan. I just got a remote control called the OneForAll Kameleon. It's an awesome remote with one problem, it's batteries die in 1-2 weeks because of it's backlight feature which automatically turns on whenever you think about touching the controller. I don't want to give it up however, so I am going to see if I can mod it. It takes 3 AAA batteries and I am planning on putting rechargeables inside. I then will then cut into it slightly and add metal contacts which link inside of the remote to the battery poles. I'm going to build a cradle for it that has matching contacts to deliver a charge (think cordless phone). Using 3 1.2V NiMHs with 700ma capacity I know I want to be charging at 70ma. I plan on just leaving the controller there whenever I'm not using the entertainment center. Ok, here is where I point out my total lack of knowledge. I only can find AC to 4.5V DC adapters that output at 700ma, this seems like a bit much (I'm thinking exploding batteries). I know I need to knock it down to 70ma, I just don't know how. Please help me, and feel free to just make fun of me for being an idiot too. Thanks, -Fritz |
#3
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On Thu, 29 Jan 2004 09:26:48 +0000, Fritz wrote:
Ok, to start out, I have no idea what I'm doing. Now that' I've gotten that out of the way, here is the plan. I just got a remote control called the OneForAll Kameleon. It's an awesome remote with one problem, it's batteries die in 1-2 weeks because of it's backlight feature which automatically turns on whenever you think about touching the controller. I don't want to give it up however, so I am going to see if I can mod it. It takes 3 AAA batteries and I am planning on putting rechargeables inside. I then will then cut into it slightly and add metal contacts which link inside of the remote to the battery poles. I'm going to build a cradle for it that has matching contacts to deliver a charge (think cordless phone). Using 3 1.2V NiMHs with 700ma capacity I know I want to be charging at 70ma. I plan on just leaving the controller there whenever I'm not using the entertainment center. Ok, here is where I point out my total lack of knowledge. I only can find AC to 4.5V DC adapters that output at 700ma, this seems like a bit much (I'm thinking exploding batteries). I know I need to knock it down to 70ma, I just don't know how. Please help me, and feel free to just make fun of me for being an idiot too. Charging NiMh cells is not straightforward. They use a constant current charger (similar to nicads). If you use a simple supply (like in el-cheapo chargers) you MUST limit the current to a maximum of 1/10th of the cell's capacity as you pointed out. Unfortunately you can never obtain a full charge in this way due to the cell chemistry. The correct way to charge them is to use a constant current source and monitor the voltage across the cell. In addition you should use a cut-off timer to prevent overcharging in the event of a failing cell. High speed chargers (1h or less) often also monitor the cell temperature for each cell. There are specialised ICs to handle the charging procedure to make it easier! In addition to all that, you must cut off the discharge when the cell voltage drops to about 1v per cell to prevent possible reverse charging from other cells during the discharge process. This means that it is usually bad practice to power things like torches or motor-driven devices from NiMh cells as the cutoff circuitry doesn't usually exist. Personally, I would not recommend embedding NiMh cells into anything unless at least the discharge monitoring and temperature sensing equipment is also embedded with it. You may hit another more serious problem though, the cell voltage. The controller will be expecting at least 4.5v (1.5v x3) throughout most of the battery life and you intend only putting 3.6v (1.2v x3) onto it. It really needs 4 rechargable cells to replace 3 zinc-carbons. It is quite possible that it won't work at all, or that the cell life will be very short indeed. At the very least, try it without modifying the unit! -- Mick http://www.nascom.info for Nascom & Gemini information Also at http://www.mixtel.co.uk where the collection started. Currently deserting M$ for linux... :-) |
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