simple logic circuit

uuhhh..I'm not really sure about this..
i'm an electronics engineering student
and my instructor in Logic Circuit and Switching Theory
requires us to make a project which will include logic gates.

now i searched in the net for some ideas
i found two..but i know i shouldn't copy their projects..
can anyone help me?


thanks guys!

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hazelcharisse (author) 9 years ago
we have to use those logic gates. our instructor in Logic circuit and switching theory told us to use ICs but when we asked for an advice from another instructor he told us that we should make our own logic gate since it's impractical to use ICs if (for example) we only need to use one inverter gate, if we would buy one Hex inverter IC then its like buying 6 logic gates!
Your second instructor is whacked. The hex inverter has 6 gates, but it will typically cost less than the parts to "build" a single inverter from scratch.
Patrik westfw9 years ago
Your instructor may have meant that if you build something that only takes a single inverter, you're not going to get full credit unless you make it worth his while. Kinda like how a circuit consisting of a single diode could be OK for an electronics class, but only if you were to build the diode yourself! :-)
Goodhart westfw9 years ago
I agree and the CMOS # 4000 - Dual 3-Input NOR Gate and Inverter or the # 4002 - Dual 4-Input NOR Gate OR Gate are Duals.
Lets see: the 4007 is a dual complimentary pair and an inverter Data sheet here at this link...

anyways, here is the transistor representation of an inverter: .

Transistor inverter.gif
hazelcharisse (author)  Goodhart9 years ago
i mean.. we have to make a circuit which uses logic gates.

like this one
Ok, well, without doing all the work, here is a section with some computer related ideas.
Patrik9 years ago
Sooo many choices. Let's approach it from another direction - do you have any hobbies that you'd like to add a little automation to?
westfw9 years ago
More suggestions:
  • a clock. Not so original, but try one of the "interesting" display formats that have been done or mentioned on Instructables.
  • dice. Ditto on not original, but how about dice with more than 6 "sides" (gamer dice!) For extra credit, have the max count be an input via switches of some kind.
  • TV display. While a full "TV typewriter" is probably too complex, you might be able to do something that blinks a computer monitor through its several possible colors (full screen of color each time.)
westfw9 years ago
So do you have to build something out of your "basic" logic gates (and, or, not), or do you get to use the more complicated chips that are available in "logic" families like flip-flops, shift registers, counters, and so on?
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