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Power Supplies Learning Outcome 4 Identify switched mode power supplies and interpret their operation. The main topics are interpretation of the block diagram, pulse width modulation, transistor switching, LC filter, flyback diode, switching frequency and duty cycle. Starting points from Electrical Fundamentals (Int 2) The determination of current and voltage relationships in d.c. networks, for example voltage division and current division. Power, current and voltage relationship. Starting points from Introduction to Semiconductor Applications (Int 2) Zener diode, transistor operation, operational amplifier comparator and measurement of circuit voltage levels. Starting points from Combinational Logic (Int 2) None Electronics (H): Power Supplies – Teacher/Lecturer Materials 8