What is the purpose of a common cathode in electronic circuits?

[zeroground]

1. i want to design a 2 bit full adder (that adds two numbers each having 2 bits) with carry in and carry out and to show the output on seven segment display..




3. the problem is that i am student in mechanical power and i am taking an electronics course..can you tell me what to do or some hints please..

 

[zeroground]

answer me pleaseee... what do i have to do ?
is there an ic called full adder or i have to make it with OR and AND gates ?

 

[Janus]

You can get a 4-bit full adder as an IC:

http://www.doctronics.co.uk/4008.htm

 

[zeroground]

Janus, can u tell me what to do please with my project ?

 

[berkeman]

Janus, can u tell me what to do please with my project ?

We don't give out answers to homework here on the PF. We can offer tutorial help if you show us your work. Read this about full adders:

http://en.wikipedia.org/wiki/Full_adder#Full_adder

And this about 7-segment displays:

http://en.wikipedia.org/wiki/7_segment_display

Then sketch up your initial thoughts, and ask us specific questions about your circuit if you have any.

 

[zeroground]

is there vcc and ground for the seven segment ?

 

[zeroground]

what is the common cathode (3,8) ? does it means that these two pins (3,8) must be connected to the ground ?