# pleas help me :( -Digital Clock in Multisim

Discussion in 'Homework Help' started by tamialjamily, Dec 8, 2015.

1. ### tamialjamily Thread Starter New Member

Dec 8, 2015
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my teacher asked me for make a digital clock using multisim by jk flip flop counter and dcd_hex

2. ### crutschow Expert

Mar 14, 2008
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Please be more specific in future posts.

So what have you done so far?
This is a Homework Help forum not a Homework Do.

3. ### ian field Distinguished Member

Oct 27, 2012
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UR such a party pooper...........................

4. ### crutschow Expert

Mar 14, 2008
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I'm an expert at that, rather like the Cooler in a Las Vegas casino.

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5. ### WBahn Moderator

Mar 31, 2012
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So.... what have you done so far?

What kind of digital clock?

What features does it need to have?

What is dcd_hex?

6. ### tamialjamily Thread Starter New Member

Dec 8, 2015
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-_- u wanna to help me or not

Dec 8, 2015
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8. ### DerStrom8 Well-Known Member

Feb 20, 2011
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You need to help us first. We're not here to do your homework for you. You need to show us ALL of your work and attempts first. Only the will we point out where you went wrong and point you in the right direction. We will not solve anything for you.

absf likes this.
9. ### WBahn Moderator

Mar 31, 2012
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A schematic is definitely one step in the right direction, but it does nothing to help us understand what the problem is asking for or whether you are doing what is asked of you. Your schematic shows two four-bit circuits each driving a single digit display with no apparent interaction between them. How does this constitute a "clock"? Maybe it does, within the context of this assignment, but we have no idea what that context is. As a result, we have to guess, based on the circuit, what it is supposed to do. But if we do that then the only conclusion we can come to is that it is supposed to do whatever it is that is actually does, making it impossible to know whether there is a problem with it.

We need you to describe the specific project specifications and then walk us through YOUR design. Then we are in a position to spot areas where you are going astray.

Dec 8, 2015
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File size:
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11. ### WBahn Moderator

Mar 31, 2012
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Repeating yourself by attaching the same file again does not move the discussion forward.

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12. ### ian field Distinguished Member

Oct 27, 2012
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Last MSI digital clock circuit I saw used a lot of 7490 BCD decade counters and a few of the 16 bit type.

The 7490 internal structure is made up with interconnected divide 2 flip flops that reset themselves at the required count. The 16 bit counters are nothing more than cascaded divide 2 flip flops.

AFAIK: the 7490 is obsolete and had been replaced by a new device with 2 BCD counters in the same package (possibly a 74290) - the internals of either can be found online.

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13. ### DerStrom8 Well-Known Member

Feb 20, 2011
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That schematic is pretty much useless. Doesn't help us at all. Try again.

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14. ### absf Senior Member

Dec 29, 2010
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May be this would get you started... 3 JK Flip flops that would count to six.

Look for /10 and /12 circuits that use JKFF on the net.

Allen

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15. ### JoeJester AAC Fanatic!

Apr 26, 2005
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ok ... is it 12 hour format or 24 hour format?

Can you draw a block diagram of what you need to do?

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Apr 5, 2008
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Dec 8, 2015
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18. ### tamialjamily Thread Starter New Member

Dec 8, 2015
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no just one clock by jk f/f

Apr 5, 2008
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Hello,

On the following page of the EDUCYPEDIA you will find links about couters and registers:
Counters & registers

Bertus

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Dec 8, 2015
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thanks ^_^