Digital lab math & others

+5v regulated power supply

CD4049 cmos hex inverter
ufff!!! This week i was so busy.For the digilab www.play-hookey.com
helps me to construct a digital lab in my home.For this i face some problems:
1.IC s price is double in stadium to patuatuli.
2.DIP SWITCH ,most rare switch but when i meet with a buet engg near stadium market after searching for 3 hours ,he suggest me to go to Electronics spare, hossain market,patuatuli ,where i get it at only 20 taka, but in stadium it is 60!

DIP switch

exp-04

somehow ,i am confused ,as they use diode for exp. but i use TTL IC.but finally it works !!!!!!!!

Q:why this first bench is vacant?

as the math exam begins ,all the first bencher's are last bencher rabbi (mathematician) ,robin,pritom,imran,noyon and me also!!!!!!!!!!!!
tips:drive ur car safely or..............

near aust campus,karwan bazar.