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Posted by ozkal on Tuesday, June 20 @ 17:04:29 EDT (5727 reads)
Topic Güneş panelleri
|Solar powered LED torch.
The circuitry is a simple switch mode DC-DC convertor which rises the input voltage of 1.2v to around 7 volts. This voltage is applied to two superbright leds connected in series. Project Details can be found in Yavuz Erol's nice article here. The circuit originally draws around 200ma current. I've made some modifications and it now needs only 50mA while nearly the same amount of light is generated by the LEDs.|
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|Solar Power Experiments|
Posted by ozkal on Friday, December 10 @ 14:44:34 EST (22427 reads)
Topic Güneş panelleri
|In this article, we'll present two separate solar panel application. In both applications,
we use our general purpose solar panel which yields approximately 200ma current at 1.6V under direct sunlight.
Namely, one solar panel can replace an AA size battery easily and can drive two high quality motors taken from a junk
CDROM driver or one low quality motor which can usually be found in chinase made toys.|
Neither of the applications require any electronic component. Only a solar panel and some mechanics. In the first one,
a solar panel directly drives a DC motor which is removed from an old CDROm, and the motor turns a small fan. This
application is used in many fields like caravan, boat cooling, air-conditioning. Principle is simple, when the sun
starts to shine, the solar panel generates electricity and the electricity runs the DC motor, dc motor turns the fan.
Thousg we use high quality motor and panel, no direct sunlight is necessary for the operation of the motor and under direct
sunlight, the motor easily climbs to high revs. You can also use a similar application at home, at the beach etc and
can easily enlarge the size of both panel and the dc motor. At the end of the article, you can download a small
videoclip of the fan running with solar energy.
The second application is a solar-car, similar cars can also be seen in many hobby websites on the net. This one is simpler,
again there is no electronic components, the panel is directly connected to a junk toy-car mechanic's electric motor and
drives it under direct sunlight. There is even no need for soldering. You can connect ordinary wires from the panel
to the motor by twisting them. Anyone can build this project though it is very simple. By making a solar-car for each of
your friends, you can organize solar car races ;)
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|Solar Antique Radio|
Posted by ozkal on Thursday, June 19 @ 07:04:02 EDT (6445 reads)
Topic Güneş panelleri
|This is not a robotic project. But a nice one which is very fun to work on and also would be very useful at home or outdoors when completed. An FM radio which works with solar energy. The design looks like a classic wooden radio repplica from the front although it is much smaller in size. The back is where 2 small solar panels are located.|
I've made the radiobox by using 6mm marine type plywood which had remained from building my small sailboat and had been lying around since then. The radio chassis is a box with dimensions 15 x 15 x 5 cm.
First i've cut out the plywood pieces to form the box, sanded them a bit and sewed the pieces together with copper wire in the desired shape. Any wire, even plastic ties can also be used for the purpose. The method is in fact used in boatbuilding mainly and called as "stitch and glue boatbuilding". And I guess this is the first time the method is used for building a radio instead of a boat hull. :) You may find additional info about stitch and glue method on our boatbuilding site . Then i've glued the pieces which are being held together by the stitching wire, using the putty i've prepared (mixed wooddust with epoxy glue). All the inner and outer parts of the plywood box are also covered with multilayers of epoxy.
The box was very strong when the putty cured.
I've opened two holes on the front face of the box for the volume and tunning dials. And many small holes where i thought the loudspeaker would be mounted. I've made the frontface easily openable by only unscrewing two screws for enabling later access in case of a problem.
read on for more info and photos............
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