2. Eg.Why IC 741 and why not IC 742?
There are certain reasons.
3.
4. PIN DIAGRAM
WHY IT IS NAMED AS IC
741
There are 8 pins
7 pins are Active i.e Pin
1,2,3,4,5,6,7
1 Pin is inactive i.e Pin
4 Pins are for input i.e
Pin Nos. 2,3,4,7.
5. BLOCK DIAGRAM
WHY IC 555?
Timer IC
The name of 555
came from the three
5kOhms resistors at
its input!