#### Tarquin

Joined Dec 14, 2006
11
I need the circuit for a 4 bit binary adder using JK Flip Flops.

#### Dave

Joined Nov 17, 2003
6,969

Dave

#### beenthere

Joined Apr 20, 2004
15,819
Hi,

That's a fun assignment. It's a bit like having to make a car out of bricks - possible, but a bit clunky.

#### Papabravo

Joined Feb 24, 2006
21,227
I need the circuit for a 4 bit binary adder using JK Flip Flops.
Adders don't require flip-flops. It's a combinatorial circuit.

#### beenthere

Joined Apr 20, 2004
15,819
But think of the challenge.

#### Papabravo

Joined Feb 24, 2006
21,227
Nonsense! Who would even think of such a question?

#### thingmaker3

Joined May 16, 2005
5,083
Some instructor in Bhopal, obviously.

#### Papabravo

Joined Feb 24, 2006
21,227
Some instructor in Bhopal, obviously.
......or not since the OP didn't say he was in school. The chief engineer might be engaged in a bit of hazing.

#### Tarquin

Joined Dec 14, 2006
11
I am in an engg college. Could u atleast get me started in the right direction (regarding the assignment), however silly it might seem to u at present.

#### Papabravo

Joined Feb 24, 2006
21,227
I am in an engg college. Could u atleast get me started in the right direction (regarding the assignment), however silly it might seem to u at present.
I already did. A binary adder is a combinatorial circuit which can be synthesized with logic gates alone. The input values and output values may be held in registers constructed with any of several different kinds of flip-flops. One of those types is the JK type.

The adder has three inputs, called operand A, operand B, and Carry In. It produces two outputs called Result and Carry Out. The carry out from one stage is connected to the carry in of the next stage. The carry in to the lowest stage can be set to zero. Make yourself a truth table and just do it! Is that enough help or do you still need more?

#### Tarquin

Joined Dec 14, 2006
11
Thanx!!

#### Papabravo

Joined Feb 24, 2006
21,227
It would be great if you could post your results for all to see.