工业控制 | 能源技术 | 汽车电子 | 通信网络 | 安防监控 | 智能电网 | 移动手持 | 无线技术 | 家用电器 | 数字广播 | 消费电子 | 应用软件 | 其他方案

电路设计->光电电路图->其他光电实用电路图->黑暗激活LED或灯闪光电路

黑暗激活LED或灯闪光电路

发布人:dolphin 时间:2013-04-15 收藏

黑暗激活LED或灯闪光电路
黑暗激活LED或灯闪光电路--Dark-activatedLEDorLampFlasher
Simplephoto-sensitivecircuit3VbatterysupplyParts:R1_________________Photoresistor(anytype)R2________________100K1/2WTrimmerCermetR3,R4______________10K1/4WResistorsR5________________470R1/4WResistorR6_________________47R1/4WResistorC1________________220F25VElectrolyticCapacitorD1______________1N414875V150mADiodeD2_________________LEDAnytypeandcolor(SeeNotes)Q1,Q2____________BC33745V800mANPNTransistorsSW1_______________SPSTSwitchB1__________________3V(Two1.5VAAorAAAcellsinseries,etc.)Circuitoperation:ThiscircuitadoptstheratherunusualBowes/Whiteemittercoupledmultivibratorcircuit.Theoscillationfrequencyisabout1HzandissetbyC1value.TheLEDstartsflashingwhenthephotoresistorisscarcelyilluminated.TheonsetofflashingcanbesetbytrimmingR2.Notes:BestresultsinflashingfrequencycanbeobtainedusingforC1avalueinthe100to1000Frange.Todriveafilamentlampthefollowingchangesmustbemade:Usea2.2to3V,250-300mAlampinplaceoftheLEDR2=10K1/2WTrimmerCermetR3,R4=1K1/4WResistorsR6=1R1/4WResistorC1=470to1000F25VElectrolyticCapacitorInLED-modeoperationthestand-bycurrentconsumptionislessthan400A.InLamp-modeoperationthestand-bycurrentconsumptionisabout3mA.




评论

技术专区