Week 9 Friday -- MAE 412

• Power Dissipation in Controlling Device (Resistor, Transistor, SCR, MOSFET, etc.)
• Relay Control Circuit
• Railroad Switch Control  with Transistors and Relay - Trickle Charge Circuit
• Power MOSFET (N channel device similar to NPN), I _DS vs V_DS , Use as ON/OFF Switch
• Optical Proximity Detector Circuit - one threshold
• Optical Proximity Detector Circuit - two threshold (Schmitt - trigger)
• Bar-Code Reader and Clear Circuit

• For information about the Interrupt Service Routine read Chapter 5 on Communications by Gurion and Simon in Volume 1 of the On-line Text.
• For information about the Bar-Code Reader, RR Signal Control, and Interlocking Control (Track Kill) read Chapter 6 on Block Management by Lecky and Fiderer in Volume 1 of On-line Text.
• Read Chapter 2 of Volume 1 of the On-line Text ("Hornby Railways ...")
• Document your working computer using ORCAD (see example on CIRCUITS page) -- Hand in next Tuesday (include 74LS244 buffer).
• Read Chapter 3 of CST -- available on-line (go to BLACKBOARD => LIBRARY => e-reserves => authentication page => user:mae412 password:littman1).  Continue studying the 6502 instruction set.