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1、电子工程师必备基础知识(一)()BasicknowledgeofElectronicEngineers(1)Operationalamplifiersarewidelyusedinanalogcircuitsanddigitalcircuitsthroughsimpleperipheralcomponents・Therearemanytypesofoperationalamplifiers,butthereareseveraldifferencesintheperformanceparameters,buttheprincipleisthesameasthem
2、ethodofapplication.Anoperationalamplifierusuallyhastwoinputs,theforwardandthereverseinputs,withonlyoneoutput・Inadditiontotwoinputsandoneoutput,someoperationalamplifiersalsohaveseveralcompensatingpinstoimproveperformance・Theresistanceofaphotosensitiveresistorvariesmarkedlywiththeinte
3、nsityoflight・Therefore,itcanbeusedtomakeintelligentcurtain,streetlampautomaticswitch,camerashuttertimeautomaticregulatorandsoon.Thereedtubeisanelectroniccomponentthatcancontroltheon-offofacircuitthroughamagneticfield.Theinnerreediscomposedofasoftmagneticmetalreed,andinthecaseofamagn
4、eticfield,themetalreedcancollectthemagneticlinesandforcetheforce,soastoachievethefunctionofconnectingordisconnecting.BasicknowledgeofElectronicEngineer(two)Theroleofcapacitaneeinthreewords:"chargeanddischarge・〃・"Don，tlookdownonthesethreewords,becauseofthesethreewords,thecapacitorcan
5、passthroughthealternatingcurrenttocutoffthedirectcurrent;thehighfrequencyalternatingcurrentpreventsthelowfrequencyalternatingcurrent.Iftheroleofcapacitanceineightwords,itis:"'straightthrough,passthrough,highresistancelow.〃."Theseeightwordsareaccordingto"discharge"threewordsout,don，t
6、understandnevermind,dierote・ThefiltercapacitorcanbeselectedaccordingtothemagnitudeoftheoutputcurrentoftheDCpowersupplyandtherequirementsofthebackstage(circuitorproduct)forthepowersupply.Normally,each1amperescurrentisappropriateforthe1000UF-4700UF.BasicknowledgeofElectronicEngineer(t
7、hree)Theroleofinductanceistousefourwords:"'electromagneticconversion〃・"Don'tlookdownonthesefourwords,becausethesefourwords,inductancecancutoffthealternatingcurrent,throughthedirectcurrent:throughthelow-frequencyalternatingcurrent,hinderhigh-frequencyalternatingcurrent・Theroleofinduc
8、tance,andtheneightw
