# 3 bit binary counters

Status
Not open for further replies.

#### Mike Kniest

##### New Member
looking for examples of jk and d flip flops. I'm pretty new and dont have a complete understanding of how to construct the circuits properly in multisim and hook them up to an o-scope or function generator.

#### sahil.narain

##### New Member
looking for examples of jk and d flip flops. I'm pretty new and dont have a complete understanding of how to construct the circuits properly in multisim and hook them up to an o-scope or function generator.
im not sure about what you mean by "looking for examples of JK and D flip flops", but D flip flop effectively adds a delay to the information [either a one or a zero]. [is that what you wanted to know ?]
The expression for Q+ = Q for a D flip flop.
The expression for Q+ = J.Q' + K'.Q for a JK flip flop.

D flip flop induces a delay, suppose you give a 0 as the input to the D flip flop, the output on the next clock pulse will be 0. When you give a 1 as the input to the D flip flop, the output on the next clock pulse will be a 1.

For a JK flip flop, when JK=00, the output will be the previous output itself, ie. Q+=Q [which may be either 0 or 1]. When JK=01, then the output Q+ is 0. When JK=10, the output is 1. When JK=11, the output is the complement of the previous output, ie Q+=Q'.

For making these circuits, it is advisable to use trainer kits. Trainer kits have inbuilt options for generating clock pulses at various frequencies, and there is a port for connection to a CRO probe. To observe the output waveform, you just have to connect the CRO probe to the output port(s) of the trainer kit.
Otherwise, you can use ICs and solder them on to circuit boards and use external voltage sources [a 5V source for TTL, etc]

#### Mike Kniest

##### New Member
no, i'm having trouble constructing them and hooking them up properly in multisim

Status
Not open for further replies.