Diodes in DC circuits  Diodes in AC circuits  Half - wave rectiers with smoothing  Bridge rectiers with smoothing  Displaying diode characteristics on an oscilloscope  Light - emitting diodes  Photodiodes  Diode - like characteristics of transistor circuits  Input , output and control characteristics of transistors  Transistors in common emitter circuits  Transistors in common collector circuits  Transistors in common base circuits  Transistors used as switches  Transistors used as delay switches  Characteristics of eld eect transistors ( FETS )  FETS used as controllable resistors and switches  MOSFET characteristic  Dimmer sensor using a MOSFET  Characteristics of thyristors and triacs  Thyristors used as switches ·  Phase control using triacs and diacs  Characteristics of unijunction transistors ( UJTS )  Pulse emitter using a UJT