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If you live in a climate where sun is a rare treat and it is often overcast, you might like to experiment with a couple of additional cells in series to increase the power produced.
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Construction is fairly simple. There are a wide array of cases available that are suitable for housing such a project. If you can get a housing with an integral battery holder you will find it will make neat work of housing the project.
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Project 33: Build Your Own Solar Phone Charger
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House the cells in such a manner that they are shaded and protected from the sun. If the cells get too hot their electrolyte leaks damaging the cell and making a mess.
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If you want to build a deluxe model, you might want to consider incorporating a small milliammeter to monitor the charging status.
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Figure 13-1 Commercially available solar battery charger.
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Figure 13-2 Solar battery charger schematic.
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Project 33: Build Your Own Solar Phone Charger
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You will need
Or for the USB version:
Car charger suitable for your cell phone (for cannibalization) 7812 voltage regulator 15 V solar array
100 F capacitor 100 pF capacitor 1 mH inductor 1N5819 diode
In this project, we are going to build a circuit that will provide a supply capable of powering either a cellphone or PDA charger. A PDA is about the limit of what you can charge using small cells, a laptop charger is probably a bit ambitious. One of the problems with trying to build this circuit is that finding a suitable connector for many mobile phones is a real problem. While Nokia makes life easy by providing a simple jack that can be readily obtained from many component suppliers, many other manufacturers rely on proprietary connectors which are nonstandard and awkward to source. For this reason, we have based this project on hacking a cellphone car charger. There are two schematics here for projects that tackle the project from slightly different angles. The first method involves creating a solar array that will provide above 12 V regulating this supply to 12 V, and charging the device via a hacked car charger (Figure 13-4). The other device is suitable for where a USB type charger is available this is ideal for USB mp3 players, PDAs and mobile phones, most of which now come with a data lead. We have an array of solar cells, which charges a couple of batteries when there is spare power; a voltage regulator then turns this into a clean 5 V, which can be used to drive the device (Figure 13-5). The advantage of this circuit is that even if there is not a lot of sun or it is night-time, you can pop a couple of freshly charged batteries in (maybe from your solar charger ) and things will start working. Car chargers are designed to allow you to plug your phone into your vehicle s cigarette lighter or accessory socket. They are cheap and readily available; however, they rely on having a car present to allow you to charge your phone! There are a couple of ways of making this project. You can either build the project as a box into which you plug your car cellphone charger, or, if you are a little more adventurous, you can take apart the cellphone charger and integrate it
Project 33: Build Your Own Solar Phone Charger
Figure 13-3 A solar-powered phone albeit not all that portable.
274 k resistor (1% tolerance) 100 k resistor (1% tolerance) 100 F capacitor USB socket MAX 630 CPA integrated circuit
It s the same old story just when you want to talk on your cellphone, the battery goes flat and the conversation is irretrievably lost! Invariably, you haven t got your phone charger on you, and even if you did have it wouldn t be an awful lot of help as the chances are there is no power for miles around . . . At the Centre for Alternative Technology, U.K., there is a solar-powered phone (see Figure 13-3); while this is powered by clean green energy, it can t claim to be very portable!
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