Transistors come and transistors go. One of the problems that technicians must solve is finding good substitute parts. Find some substitution guides and learn how to use them. Talk to other students, racticing technicians, and your instructor and ask them how they find replacement parts. Try to find out when substitutes work well and when they can be a problem. Can you find any Websites for substitutes?
Visit the Discrete Index of the Questlink Design Center. It is a window to electronic components such as BJTs, FETs, diodes, and optoelectronic devices. By searching and browsing, you will find many interesting facts. As an example, there is an NPN transistor with the part number BUS50 that has a current rating of 70 amperes. Browse this site and collect part numbers and characteristics for at least 6 devices. Share what you find with your instructor and classmates.
