how can you make a homemade electoscope?
139349
If you mean electroscope then go here to see instructions on building your own:\nhttp://www.exploratorium.edu/snacks/electroscope.html\n\nHere's some more information:\nhttp://en.wikipedia.org/wiki/Electrometer
47409
You could experiment with various mixtures, solutions, and compounds around the house, like saltwater, cleaning solutions, cooking ingredients, clean water, beverages, or stuff like that.  Find an electrolyte tester, or you can make one yourself by connecting a battery and a lightbulb to two independent probes (alligator clips work really well for this), then dip the probes into the liquids to see if there are enough electrolytes in the solution to sustain an electric current by recording whether or not the light bulb lights up.
654731
You can try to make a battery out of a lemon.  Check out this website:\nhttp://www.hilaroad.com/camp/projects/lemon/lemon_battery.html
334112
they drill it with a really thin drill. :)\nor roll it from a foil and then fuse it.\nOr cast it in a pipe with a thin rod throught the middle.\n\nif they can fit thousands of parts onto an inch-square microchip, making a needle shouldn't be that much of a problem.
983731
Check out the information on ebay or amazon.  It will give you ideas.  Imitation is the mother of invention.
103533
A simple voltaic device can be made with a piece of fruit and 2 pieces of dissimilar metals.  It won't run your house even if you have lots of them.  The juice serves only as the electrolyte, not the energy source.\n\nFor real power, you'd need to ferment and distil the juice and put it in a fuel cell.  There's lots of fuel cell info online.
599950
Are you looking for something like this, a homemade wind turbine to generate electricity?\n\nhttp://www.otherpower.com/17page1.html
805418
Here's a site with alot of different ideas and difficulty levels with instructions.  Maybe you can find something here.\n\nOr you can tell us more about what you are wanting to do and what you like and we might be more helpful on here.\n\nhttp://www.all-science-fair-projects.com/
33350
If you are into electrochemistry you could make your own solar cell or a flat panel solar cell. A solar cell is a device for converting energy from the sun into electricity. This project is fairly easy and there are plenty of pics to show you exactly how its done. \n\nAlso read the first source listed first because it tells you things you need to know for the second experiment.
1007114
hey there, here's a link I found when i was searching like you as I'm also an electronic engineering student\nhttp://www.commlinx.com.au/microcontroller.htm\nthis link has a lot of simple projects... but the links below have my favorite projects, i didn't make any yet though\nhttp://www.bobblick.com/techref/projects/propclock/propclock.html\nhttp://www.luberth.com/analog.htm\nhave fun and good luck
36270
Try, Edmond scientific co,(catalog avail. on the www)\nAlso, they have been found for sale on e-bay.\nOne could also find the nearest Cub Scout leader, and ask for one of thier catalogs.(ez build,simple)\nThere are books,such as "The Ameteur Radio Handbook",\nand more at the local library. \nDuring World war two, Soldiers built them using a "Gillette Blue Blade" double edged razor blade as the diode. I have used this as an example in my classes for years, and while not the easiest to tune, they do work, and they are cheap.
513117
use a potato and two different metals as electrodes. The link will help you, do your own homework, or web searching atleast! it was the second link in google for g** sake!
610625
It depends on what superconductor do you want to make. For example, let me give you a brief idea about making the most common 'High-Tc Superconductor' YBCO:\n\nRecipe for a homemade superconductor \n1.825g or 0.005M  Y(NO3)3.5H2O \n2.614g or 0.010M  Ba(NO3)2 \n3.624g or 0.015M  Cu(NO3)2.3H2O \n\nWeigh out the ingredients and grind together thoroughly in a mortar. Transfer the mixture to an alumina crucible and place in the centre of a tube furnace. Pass a slow flow of oxygen over the mixture and bake at 350°C for 1 hour. Then increase the temperature to 950°C and cook for a further 3 to 4 hours.  \nAllow the furnace to cool somehwhat before removing the crucible with tongs and gloves. Let the crucible cool on a fire-brick before emptying the contents into the mortar. Re-grind thoroughly.  \nThen press two 13mm pellets from the mixture (at 12 tons pressure). Place them in a crucible lined with platinum foil. An unlined crucible won't do since it would contaminate the pellet. Re-heat the crucible in the furnace to 950°C with a slow flow of oxygen. Programme the furnace to cool the sample at 50°C/hour through the tetragonal-orthorhombic phase transition (at 690°C). Ensure an appropriate sign for an overnight reaction is displayed on your furnace and do remember to ask a Senior Demonstrator first! Switch off the tube furnace, allow to cool a little and then remove your sample as before. \n\nJust a note at the end: You can't say Superconductors are 'conductors' with no resistance! In fact, superconductors are materials which essentially show the following two properties:\n1. zero electrical resistance, and\n2. expulsion of magnetic field.
438682
sure. go to a science store or look up schematics on the web.
1098592
reseach word electrical diagrams. its for you do it yourselfers
229484
Here...make your own:
243347
There a many commercially availible coin counters out there, check your favorite search engine (or old school phonebook!).  \n\nIf all you want is the sensor I recomend contacting a vending machine supply/repair company for one.\n\nIf you want to make your own from scratch, just use a laser and a photo-detecter.  Have the laser hitting the photodectector and wire your electronics to count up the interuptions of the detector.