By TOM PETRUZZELLIS
54 super-entertaining tasks provide insights into the attractions, sounds, and scents of nature
Nature meets the Evil Genius through fifty four enjoyable, secure, and cheap tasks that let you discover the interesting and sometimes mysterious global of normal phenomena utilizing your personal home-built sensors. each one undertaking contains a checklist of fabrics, resources for components, schematics, and plenty of transparent, well-illustrated directions. * tasks contain: rain detector, air strain sensor, cloud chamber, lightning detector, digital gasoline sniffer, seismograph, radiation detector, and extra
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Additional info for Electronic Sensors for the Evil Genius: 54 Electrifying Projects
Sample text
As so Illany posilive ly-charged holes in silicon a re doped with boron. this sort of silicon is called p-Iype silicoll. In a solar cell. a plate of p-type silicon is p laced next 10 a pla te o f n-type silicon. At the j unctio n between the two. electro ns in the IHype p la le will migrate to the p-type p late. and vice-versa for the holes in the p-type p la te. Afte r n while. e no ug h holes and electrons would have combined to fo rm a barrier at the junction. prevenli ng furth e r flow of holes a nd electro ns.
TIle collector strip. or ri ng, which collects the electrons. becomes the negative te rminal of the cell a nd Ihe metal base plate becomes the positi\'c terminal of the ce ll . TIle negative lead. connected to the wh ite strip that runs around Ihe edge of the cell. is black, and the positive lead fro m lhe base plate El ec t r onic Sensors for th e Evi l Genius , is red. Tl1e solar cell is the voh age source. ,d is often a bancry. which is to be charged. A silicon solar ceU. o ne of the most common t"pes of photo\'ollaic cells.
Some of the ot her parts for the radiome te r are a lso available from Newark Electronics (call or write for a free catalog). Because Newark has a $7S m inimum o rder requ irement . you may want to try to t:ind the components locally. Avoid using a detector encapsu lated ill a clear plastic p:tckage like those lIsed for LEOs. 111e do med end of the package will act like a lens and co mplica te the al ignment of the detector wi th respect to the sun . Instead. use a detector housed in a miniature me ta l package with a Oat glass window.