By TOM PETRUZZELLIS
54 super-entertaining tasks supply insights into the points of interest, sounds, and scents of nature
Nature meets the Evil Genius through fifty four enjoyable, secure, and cheap tasks that let you discover the attention-grabbing and infrequently mysterious international of average phenomena utilizing your personal home-built sensors. each one venture encompasses a record of fabrics, assets for components, schematics, and many transparent, well-illustrated directions. * tasks contain: rain detector, air strain sensor, cloud chamber, lightning detector, digital fuel sniffer, seismograph, radiation detector, and extra
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Additional resources for Electronic Sensors for the Evil Genius: 54 Electrifying Projects
Or mod ulating light. The circuit is easy to bui ld and is shown in Figure 2·2. The opto-listener circuit cenlers on its light sensor. The light sensor fo r this circuit is a photovolta ic sola r cell at Dl. 'Ibe signal (TOm the sensor is coupled to the fi rst high-gain amplifi er at U I. via capacitor Cl. llle op-amp a t U I is an LM 741. but it can be replaced with a nothe r newer low-noise op-amp if desired. A coupling capaciwr a t C2 is used to connect the o m put o f the first amplifier w the audio amplifier a t U2.
Or 9 m i ll i ~ walls. Lfyo u stack a second laycr of gelatin over the flflit. the intensity of the light a ft e r it passe s through the second laye r is 90 percen t of9 O1illiwatt5. l m milliwalls. iJ you stack a third layer O\'er the second. the inte nsit), of the light is 90 pe rcent of 8. 1 O1illiwalls. 73 milliwalls. a nd so forth . If you plo t a linear graph of the intensities of light transmitted thro ugh the various layers of the gelatin. the line thai results will be curved. If you plol Ihe intensities on a logarithmic graph.
LOOK. a nd I megOhm resistors) could be swi tched in place. one at a time. If you plan to assemble the instrument in a pocket-size e nclosure. you will need to usc a miniature rotary switch. 00 each. - - - Using a Solar Radiometer ~" aki n g meusuremenlS with a solar radiometer is relatively straightforwlI rd. To align your radiomete r with respect to the sun. simply adjust its position until the shadow cast by the collimator tube d isappears. llle dcteclOr sho uld then be stari ng di rectly at the solar disc.