el talking electronics 2011 30 led projects colin mitchell外语英文电子书

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1、emailColintv1itchell:talking@tpg.com.auBatteryMonitorMklMkilPoliceLits1,2,3Bi-ColouredLEDPOlIVeringAProjectBikeTurningSienalRailroadLiehts(tlasin;)Bi-PolarLEDDriverRGBLEDDriverQis!RGBEDFlasherDominoEffect-TheResistorColourCodesDrivingABi-ColouredLEDRouletteDrivingWhiteEDsShakeLEDTorchFad

2、ingLEDSolarGardenightFlashingALEDSolarTrackerFlashingRailroadLightsTheDominoEffectKittScannerTrafficLiiillKnitRiderTrafficLij1ts-4wayLEDChaserTurningSiif!alLEDDetectsLitUIDoVlllFadinLEDLEDDiceUp/DoVlllFadingLED-2LEDDimmerWhiteLEDon1.5vSupplyLEDFXWhiteLEDFlasherLEDNightLight2WhiteLEDson

3、1.5vSupplyLEDson120vand240v3x3x3CubeLEDZeppelin4wayTrafficLightsLights-TrafficLights8MillionGain!LowFuelIndicator10LEDChaserMainsNightLight120vand240vLEDsINTRODUCTIONThise-bookcoverstheLightEmittingDiode.TheLED(LightEmittingDiode)isthemodern-dayequivalenttothelight-globe.Ithaschangedfrom

4、adimly-glowingindicatortoonethatistoo-brighttolookat.Howeveritisentirelydifferenttoa"globe."AglobeisanelectricaldeviceconsistingofaglowingwirewhileaLEDisanelectronicdevice.ALEDismoreefficient,produceslessheatandmustbe"driven"correctlytopreventitbeingdamaged.ThiseBookshowsyouhowtoconnecta

5、LEDtoacircuitplusanumberofprojectsusingLEDs.It'ssimpletouseaLED-onceyouknowhow.CONNECTINGALEDALEDmustbeconnectedaroundthecorrectwayinacircuitanditmusthavearesistortolimitthecurrent.TheLEDinthefirstdiagramdoesnotilluminatebecausearedLEDrequires1.7vandthecellonlysupplies1.5v.TheLEDinthesec

6、onddiagramisdamagedbecauseitrequires1.7vandthetwocellssupply3v.Aresistorisneededtolimitthecurrenttoabout25mAandalsothevoltageto1.7v,asshowninthethirddiagram.Thefourthdiagramisthecircuitforlayout#3showingthesymbolfortheLED,resistorandbatteryandhowthethreeareconnected.TheLEDinthefifthdiagr

7、amdoesnotworkbecauseitisaroundthewrongway.CHARACTERISTICVOLTAGEDROPWhenaLEDisconnectedaroundthecorrectwayinacircuititdevelopsavoltageacrossitcalledtheCHARACTERISTICVOLTAGEDROP.ALEDmustbesuppliedwithavoltagethatishigherthanits"CHARACTERISTICVOLTAGE"viaaresistor-calledaVOLT