# I need to condense my 2 3-8 decoders, but i cannot figure out why.

Discussion in 'Homework Help' started by MARK.C, May 16, 2018.

May 16, 2018
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2. ### MARK.C Thread Starter New Member

May 16, 2018
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I am also at the final part, i need to condense my 2 3-8 decoders but i cannot figure out why. My circuits look the same as Jessy1221

3. ### dl324 AAC Fanatic!

Mar 30, 2015
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What school are you guys attending? Going from 3 inputs to 8 makes the problem more difficult (IMO).

Using the gear inputs more directly makes more sense. You can't use a standard logic block to do it, but it can be implemented with AND, OR, and NOT gates.

4. ### MARK.C Thread Starter New Member

May 16, 2018
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Griffith Uni.
Unfortunately, this is what they want. So what would be the easiest way to go from the 2 3-8 decoders (16 outputs) and condense it into 1 led only using AND, OR and NOT gates?

5. ### dl324 AAC Fanatic!

Mar 30, 2015
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This is homework, so we can only give guidance.

How would you solve any other combinational logic problem that had 6 inputs and 1 output?

EDIT: And a belated Welcome to AAC!

Last edited: May 16, 2018
6. ### MARK.C Thread Starter New Member

May 16, 2018
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MMm, I cant seem to figure it out.

7. ### MARK.C Thread Starter New Member

May 16, 2018
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My difficulty is within this last section, I dont know how to connect the last part.

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8. ### dl324 AAC Fanatic!

Mar 30, 2015
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I don't think you're wiring the thing you're calling a selector correctly.

Can you post your lecture notes that covered doing something similar?

I can make the "selector thing" work, but it requires a brute force method for solving the problem.

MARK.C likes this.
9. ### MARK.C Thread Starter New Member

May 16, 2018
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Thank you for the help, i figured it out

10. ### dl324 AAC Fanatic!

Mar 30, 2015
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Didn't do much, but you're welcome anyway.