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8-Bit ALU Build Help

Guest RET.CW4.ThievingSix=US=

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Guest RET.CW4.ThievingSix=US=

So one of my assignments is to design and build an 8-Bit ALU using discrete components( i have a year to build it so times not too much of an issue). I'm at a point where i've got the schematics drawn up for all my 8-Bits but i was just wondering if anyone knew anything about digital logic and could help me. I've chosen just to use AND, OR and NOT gates and im aware of NAND but i chose not to do them because the transistor count would have been higher(i think).


So here's my logic diagram(adding for 1-bit)




And here's my circuit diagram(adding for 1-bit)





Am i doing everything right here?, as far as i can tell i am, but i'd rather have another eye who knows what their doing look over it(its unfortunate i know a bunch of engineers who can't remember anything from digital logic).


Whats really confusing me is practically applying the gates. I know transistors should flow from collector to emitter and i'm using BC547 NPN's the data sheet is here http://www.datasheetcatalog.org/datasheet/philips/BC546_547_3.pdf but im unsure if i've got them hooked up right, because i don't want mistakes coming through on my PCB later on in the process.

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