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Additional resources for Mother Earth News (Summer 2016)
FigureI showstheschematic diagram oftheAudioSwitch. thatthe Observe heartof thecircuitis a commongeneral-purpose NPNtransistor thatactsas a DCamplifier. forthisproject. The terminal stripcanbe flxedon a woodenboard. Position of thepolarized components, suchasthediodes,powersupplyand capacitor C2,mustbe observed. To usethisaudiorelayyou haveto wirepontsA andB to the outputof an powerrequiredis 5 watts)andadjustthevolume (minimum audioamplifier controlfor bestoperation. A smalltransistor therelaywith outputtransformer shouldbeusedto operate low-impedance signals, suchastheonesfromtheoutputof audioamplifiers.
Anypieceof stitfwirewillserveas theantennaandwillgivegoodcoverage. Forbetteroperation, antennalengthshouldbe between 5 and15inches. Thesignalscanbetunedin distances upto 150feet. Onlyone transistor as usedas a high-frequency oscillator. AnysmallRFNPNtransistor canbe usedforthetask. Don'tusemetalfilmcapacitors insteadof the ceramiccapacitors whicharecalledfor in thepartslist. Youcanalsousea terminalstripas chassisas shownin Figure3,butkeep allthecomponent terminals andwiringshortto avoidinstability.
Thefrequency andintensitydependsuponthe application andtypeof insectandcan be foundthroughexperimentation. Thecircuitshownheregenerates a continuous soundthatcan be usedto repel(orattract)sometypesof insects, or in scientific experiments involving animals. Ourinsectrepellent canbe powered by9Vbatteries, twoM cellsor fourAA cells,andits lowcurrentrequirements will extendthe lifeof thosecellsor batteries. FigureI showstheschematic diagramof the lnsectRepellent. Theheartof thecircuitis a 7555lC,a CMOStimerwiredasanaudiooscillator anddriving piezoelectric a transducer.