【英语翻译Turnonyouraudiosourceandadjustthevolumesoyoucanbarelyheartheoutputonyourspeakerandthensetupthelaserandreceiversothatthebeamstrikesthefrontfaceofthephotoresistor.Assoonasthebeamhitsthephotoresist】

　　英语翻译

　　Turnonyouraudiosourceandadjustthevolumesoyoucanbarelyheartheoutputonyourspeakerandthensetupthelaserandreceiversothatthebeamstrikesthefrontfaceofthephotoresistor.Assoonasthebeamhitsthephotoresistor,theimpedancewillvarysignificantlyandyouwillhearapopandprobablyabunchofnoise.Playaroundwiththepositionofthebeamtoseehowthepositionofthebeamonthefaceofthephotoresistoraltersthereceptionoftheaudiosignal.Youwillseethattheoptimalpositionforthebeamisjusttouchingthesurfaceofthephotocellsothatanychangesinthebeampositionfromthevibrationswillresultinthemostsignificantswinginvoltageattheoutputofyourheadphones.Ifallyouhearisaloudhum,thenyouprobablyhavetoomuchambientlightinyourroom.Incandescentlightbulbsactuallyvibrateat50or60Hertz,andyouwillhearthatinyoursystemasaloudconstanthum.Asyouhaveprobablyguessed,theLaserSpysystemwillnotperformverywellinthedaytimeduetoambientlightsourcescompetingwithyourlaserbeam,butthisisfinesincerealspiesusuallyoperateinthedarkness!

　　Ifyouhaveyourspeakerandlasersetuponthesameworkbench,thentheprocessoftargetingyourphotoresistorwasprobablyonlya10secondjob.Now,trytoplaceyourspeakerattheothersideofyourroomandseehowlongittakestogetthebeambacktothetarget!IfoundthatthedistanceacrossaroommadethealignmentsignificantlymoredifficultandeventhedeflectiononthefloorasIwalkedaroundmadehugechangesinthepositionofthebeam.Youwillalsohavenoticedthatanyslightvibrationsofyourdeskorspeakerstandresultedinallsortsofwildandwackysoundeffectscomingthroughyourheadphones.Atonepoint,Iwasabletohearmyownvoiceduetothethinsurfaceofoneofmytablesvibratingthespeakerstand.

　　TheseinitialtestsbecomeveryimportantsothatyouunderstandhowwelltheLaserSpysystemworks,butatthesametimehowincrediblefinickyitwillbetoalignatanyrealdistance.Eventhoughyourtestrigconsistsofnothingmorethanacheaplaserpointerandthreesemiconductors,itisactuallyafullyoperationalunitthatcouldactuallylistentoaconversationamileawayifyoucouldsomehowcapturethereturnbeam.Seriously,this$2unitisnotmuchinferiort