Elec1101 (1 Viewer)

[Winston]

Originally posted by Wyvern
when they say how many octal digits needed to represent numbers upto 20000.......how do you do that without calc? lol

That's when u really need a calc ...

basically it's just like

8^n = 20 000

so your best bet is to guess around 6 or 7 or lower etc... and see which one gives it around that digit... so you're gonna have to go back to primary school multiplication ... 8 x 8 x 8 x 8 x 8 x lol...

 

[Wyvern]

haha.........ill be working that out for half the test

 

[Carlito]

Do you reckon they will ask similar questions this year? 2002 vs 2003 seem totally different

 

[Winston]

Originally posted by Carlito
Do you reckon they will ask similar questions this year? 2002 vs 2003 seem totally different

They're goal is to screw us over so we fail and then pay more dough to do summer school, it's their aim.

 

[Carlito]

look at the SID's in the labtest results page. so many are 2003 students doing it again

 

[Winston]

Originally posted by Carlito
it looks as if some people have repeated since 2001 if you look at the SID's in the labtest results page

"some" ? lol... the whole dozen dude... fuck i shouldn't of picked this elective

 

[Wyvern]

how do you simplify sum of product expressions using k-maps?

isnt the point of kmaps to simplify from the truth table...........i hate this

 

[Carlito]

fuck i can barely do question 1, and i can sort of do question 2 and 4 after looking at the answers.

q3 - the kmap thing. buggered if i know.
q5 - looks exactly like a tute quetsion that i never understood how to do. i guess ill go see if i copied down the answer, but like theres any point because i dont think theyll put the same question in twice 2 years in a row
q6 - umm.. ripple counter.. .hrmm... i kinda remember those. but 1.2 killopulse persecond output from a 18 killopulse per second input..... wtf?
q7 - umm.. excuse me while i get my magnifying glass
q8 - [blank look]
q9 - [blank look]
q10 - like im even going to bother reading the last question on the paper

overall - why are we bothering trying the past papers, when 2002 is completely diff to 2003, thyere not even similar.

 

[Winston]

Originally posted by Wyvern
how do you simplify sum of product expressions using k-maps?

isnt the point of kmaps to simplify from the truth table...........i hate this

Nah it's quite easy too, you just need to know how to circle them... like if you circle a quad, you eliminate 2 terms if i remember right :S... and you try to circle larger blocks that yields more terms being eliminated.

Basically... once you'e circled something, say you circled a group of only two bits, you look amongst them to find the common terms
ok i'll give you an example

say you circled two blocks and it block one had /A/BC and the other block had /A/B/C

then obviously the term(s) that are similar amongst them both are /A/B, so you keep those and eliminate the /C and C you just keep doing that to all your circled ones... and then just add them together

 

[Wyvern]

my tutor said we have to pass the test to pass the unit :/

 

[Carlito]

Originally posted by Wyvern
my tutor said we have to pass the test to pass the unit :/

Do you know what's considered a pass? I guess 50%? Shit.

 

[Wyvern]

Originally posted by Winston
Nah it's quite easy too, you just need to know how to circle them... like if you circle a quad, you eliminate 2 terms if i remember right :S... and you try to circle larger blocks that yields more terms being eliminated.

Basically... once you'e circled something, say you circled a group of only two bits, you look amongst them to find the common terms
ok i'll give you an example

say you circled two blocks and it block one had /A/BC and the other block had /A/B/C

then obviously the term(s) that are similar amongst them both are /A/B, so you keep those and eliminate the /C and C you just keep doing that to all your circled ones... and then just add them together

so you basically factorise?

 

[Carlito]

Originally posted by Wyvern
so you basically factorise?

Yeah I think the k-maps are like something that help you to factorise Sum of products equations

 

[Winston]

Originally posted by Wyvern
so you basically factorise?

Yeah you could say that, you just need to master circling them...

 

[Carlito]

Originally posted by Winston
Yeah you could say that, you just need to master circling them...

I think you circle largest groups first, then the smallest groups last . eg groups of 8 then of 4 then of 2

lol 3 pages of this thread now. i should just log onto msn, but that will make me study even less i think

 

[Winston]

Originally posted by Carlito
I think you circle largest groups first, then the smallest groups last . eg groups of 8 then of 4 then of 2

lol 3 pages of this thread now. i should just log onto msn, but that will make me study even less i think

lol... ... i've studied a little... i'm just a little stuck on the flippos flops, ring counters, the Opal JR fuck..

 

[Wyvern]

yeah i know how to do it when we are given a truth table but i am talking about 2002 paper question 5

we just factorise there right?

i need all the marks i can get on those easy ones..........building flip flops and all that........all i can say is that ill meet you there

 

[Winston]

Originally posted by Wyvern
yeah i know how to do it when we are given a truth table but i am talking about 2002 paper question 5

hmmm good point... oh i know!... so basically it's 4 inputs so construct a truth table with ABCD and list from 0 - 2^4, and ummm you fill in the numbers get the solutions then form a karnaugh map andyeah.

 

[Wyvern]

Originally posted by Winston
hmmm good point... oh i know!... so basically it's 4 inputs so construct a truth table with ABCD and list from 0 - 2^4, and ummm you fill in the numbers get the solutions then form a karnaugh map andyeah.

that would take a while to do, the first equation is huge

 

[Winston]

Originally posted by Wyvern
that would take a while to do, the first equation is huge

Indeed it is... however it's the pain staking thing of making the truth table and transcribing it to a k map.