看图识元件
器件名称实物照片符号用途单位种类电阻器http://www.go-gddq.com/upload/2006_12/061230014231081.gifhttp://www.go-gddq.com/upload/2006_12/061230014231082.gif限制电流、产生电压降(Ω)欧姆固定电阻 可变电阻 电容器http://www.go-gddq.com/upload/2006_12/061230014231083.gifhttp://www.go-gddq.com/upload/2006_12/061230014231084.gif滤波、计时、信号传送 F(法拉)固定电容 可变电容 电解电容 电感及变压器 http://www.go-gddq.com/upload/2006_12/061230014231085.gif调谐、电压升降信号过滤 H(亨利) 二极管 http://www.go-gddq.com/upload/2006_12/061230014231086.gif检波、整流、整型 发光二极管http://www.go-gddq.com/upload/2006_12/061230014231087.gifhttp://www.go-gddq.com/upload/2006_12/061230014231088.gif显示(红、黄、绿、蓝等色)控制 稳压二极管 http://www.go-gddq.com/upload/2006_12/061230014231089.gif稳定电压 光敏二极管http://www.go-gddq.com/upload/2006_12/061230014231087.gifhttp://www.go-gddq.com/upload/2006_12/0612300142310810.gif光电控制，遥控接收器 三极管http://www.go-gddq.com/upload/2006_12/0612300142310811.gifhttp://www.go-gddq.com/upload/2006_12/0612300142310812.gifNPN型http://www.go-gddq.com/upload/2006_12/0612300142310813.gifPNP型信号放大、开关 高频三极管、低频三极管大、中、小功率三极管集成电路(IChttp://www.go-gddq.com/upload/2006_12/0612300142310814.gifhttp://www.go-gddq.com/upload/2006_12/0612300142310815.gifhttp://www.go-gddq.com/upload/2006_12/0612300142310816.gifhttp://www.go-gddq.com/upload/2006_12/0612300142310817.gif信号放大、开关、逻辑(内有多个相同功能的电路) http://www.go-gddq.com/upload/2006_12/0612300142310818.gifhttp://www.go-gddq.com/upload/2006_12/0612300142310819.gifhttp://www.go-gddq.com/upload/2006_12/0612300142310820.gifhttp://www.go-gddq.com/upload/2006_12/0612300142310821.gif导通方向 不导通(无电流)用途：整流(单方向通电流)，单方向导通控制信号http://www.go-gddq.com/upload/2006_12/0612300142310822.gif http://www.go-gddq.com/upload/2006_12/0612300142310813.gifhttp://www.go-gddq.com/upload/2006_12/0612300142310823.gifhttp://www.go-gddq.com/upload/2006_12/0612300142310824.gifNPN型三极管NPN型三极管等效结构导通偏压方向http://www.go-gddq.com/upload/2006_12/0612300142310812.gifhttp://www.go-gddq.com/upload/2006_12/0612300142310825.gifhttp://www.go-gddq.com/upload/2006_12/0612300142310826.gifPNP型三极管PNP型三极管等效结构导通偏压方向用途：三极管可用作对信号放大，开关等用途(因B极无偏压，则C极无电流，所以可作开关用)。在作信 号放大时一定要在B极加上适当方向的仿压才能正常式作放大信号。
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