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Project 33: Build Your Own Solar Phone Charger
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properly into the box. The plus side of keeping the two pieces separate is that you can use the car cellphone charger as a stand-alone item, or, you can power it from the solar box. The plus side of integrating it all together is that it makes for a neat, stand-alone project and the two parts cannot become separated.
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A note on cigarette lighter sockets the usual wiring scheme is that the casing of one of these sockets is connected to the negative terminal of the battery
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Figure 13-4 Solar-powered phone charger schematic: car charger.
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Figure 13-5 Solar-powered phone charger schematic: USB type.
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Project 34: Build Your Own Solar-Powered Radio
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Project 34: Build Your Own Solar-Powered Radio
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Ferrite rod antenna 60 160 pF variable capacitor BC183 transistor 10 nF capacitor 0.1 mF capacitor 2 470 F capacitor 220 R resistor 1 k resistor 100 k resistor 2 10 k potentiometer Speaker PV cell PCB stripboard
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A solar radio is another great idea! Never mind Desert Island Discs, with a solar radio, you can ensure that if you are ever marooned, you are able to listen to your favorite radio stations! In this circuit we are going to build a simple AM radio that is powered by the sun. There are some commercially available radios powered by solar energy; however, it is relatively easy to build your own. We are basing this circuit around the MK484 integrated circuit, which takes all the hassle out of building a simple radio. The integrated circuit looks like a transistor with three pins, and reduces the amount of external components needed considerably. The schematic for the circuit is shown in Figure 13-6. The radio has two controls. The variable capacitor changes the frequency that you are tuned to, and the potentiometer acts as a volume control for the simple transistor amplifier. There are a number of commercially available solar radios; one idea for mounting, which you
Tools
Soldering iron Solder
Figure 13-6 Solar AM radio schematic.
Project 35: Build Your Own Solar-Powered Torch
Figure 13-7 Headphone mounted commercial solar radio.
Figure 13-8 Freeplay wind-up and solar radio.
could easily accomplish with the solar radio circuit above, is to mount the circuit in a set of headphones, like the solar radio shown in Figure 13-7. The radio in Figure 13-8 is the Freeplay wind-up radio invented by Trevor Bayliss. It uses
two renewable energy sources solar power, and for less sunny days human wind-up power in order to make sure that even when the sun doesn t shine, you aren t without your tunes!
Project 35: Build Your Own Solar-Powered Torch
You will need
10 k 1 4 W carbon film resistor 560 R 1 4 W carbon film resistor 2 3.3 R 1 4 W carbon film resistor C9013 NPN transistor C9014 NPN transistor C9015 PNP transistor 300 pF ceramic capacitor 100 nF ceramic capacitor
4 1.5 V solar cells 1 AA 600 mAh NiCad battery 1N5817 Zener diode 220 k 4 W carbon film resistor 100 k 1 4 W carbon film resistor 91 k 4 W carbon film resistor
1 nF ceramic capacitor 82 H inductor CdS photocell 47 k @ 10 lux 2 LEDs Figure 13-9 Solar-powered torch.
Project 35: Build Your Own Solar-Powered Torch
In lists of made-up useless things, solar-powered torches seem to come out somewhere at the top. After all, what use is there for something that produces light that is powered by light Until you realize that we can use batteries to store the energy this is a crucial leap in understanding! Now doesn t the solar torch seem so much more interesting A solar torch is a useful thing to build and then leave on a sunny window sill. In the event of a power cut, you know that you can go to your trusty solar torch to provide a (somewhat modest) amount of illumination! Figures 13-9 and 13-10 show a solar-powered torch and the solar torch in its packaging. One of the things you need to think about if you are going to house your project in a round torch case, is that you will need to ensure that either:
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