舞蹈發光二極體電路

舞蹈發光二極體電路
舞蹈發光二極體電路--DancingLEDs
Parts:R1_____________10K1/4WResistorR2,R3__________47K1/4WResistorsR4______________1K1/4WResistorR5,R6,R7______100K1/4WResistorsR8____________820R1/4WResistorC1,C3_________100nF63VCeramicorPolyesterCapacitorsC2_____________10΅F50VElectrolyticCapacitorC4____________330nF63VPolyesterCapacitor(SeeNotes)C5____________100΅F25VElectrolyticCapacitorD1___________1N414875V150mADiodeD2-D11_________5or3mm.LEDs(anytypeandcolor)IC1___________LM358LowPowerDualOp-ampIC2____________4017Decadecounterwith10decodedoutputsICM1_____________MiniatureelectretmicrophoneSW1____________SPSTminiatureSliderSwitchB1_______________9VPP3BatteryClipforPP3BatteryAdditionalcircuitparts(seeNotes):R9,R10_________10K1/4WResistorsR11____________56R1/4WResistorD12,D13etc.____5or3mm.LEDs(anytypeandcolor)Q1,Q2_________BC32745V800mAPNPTransistorsQ3____________BC33745V800mANPNTransistorDevicepurpose:ThebasiccircuitilluminatesuptotenLEDsinsequence,followingtherhythmofmusicorspeechpicked-upbyasmallmicrophone.Theexpandedversioncandriveuptotenstrips,formedbyuptofiveLEDseach,at9Vsupply.Circuitoperation:IC1Aamplifiesabout100timestheaudiosignalpicked-upbythemicrophoneanddrivesIC1Bactingaspeak-voltagedetector.ItsoutputpeaksaresynchronouswiththepeaksoftheinputsignalandclockIC2,aringdecadecountercapableofdrivinguptotenLEDsinsequence.Anadditionalcircuitallowsthedrivingofuptotenstrips,madeupbyfiveLEDseach(max.),at9Vsupply.Itisformedbya10mAconstantcurrentsource(Q1&Q2)commontoallLEDstripsandbyaswitchingtransistor(Q3),drivingastripobtainedfrom2to5series-connectedLEDs.ThereforeonetransistoranditsBaseresistorarerequiredtodriveeachstripused.Notes:ThesensitivityofthecircuitcanbevariedchangingR4value.C4valuecanbevariedfrom220to470nFinordertochangethecircuitspeed-responsetomusicpeaks.Adoptingtheadditionalcircuit,onlyoneitemforR10,R11,Q1andQ2isrequiredtodriveuptotenLEDstrips.Onthecontrary,oneitemofR9andQ3isnecessarytodriveeachstripyoudecidedtouse.EachR9inputmustbeconnectedtoIC2outputpins,inplaceoftheLEDsD2-D11shown.R8mustalsobeomitted.WhishingtousealowernumberofLEDsorLEDstrips,pin#15ofIC2mustbedisconnectedfromgroundandconnectedtothefirstunusedoutputpin.Example:ifyoudecidedtouse5LEDs,pin#15ofIC2mustbeconnectedtopin#1;ifyoudecidedtouse8LEDs,pin#15ofIC2mustbeconnectedtopin#9etc.Currentdrawingofthecircuitisabout10mA.Whishingtouseawall-plugtransformer-supplyinsteadofa9Vbattery,youcansupplythecircuitat12V,allowingtheuseofupto6LEDsperstrip,orat15V,allowingtheuseofupto7LEDsperstrip.