0730: "Circuit Diagram"

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eviloatmeal
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Re: "Circuit Diagram" Discussion

Postby eviloatmeal » Wed Apr 21, 2010 1:16 pm UTC

Naiin wrote:Anyone else notice the random methyl group added? That gave me a chuckle.
Yes! :lol:

I didn't get through all the comments, but it seemed like nobody noted that this thing is powered by hamsters!

Seriously though, this is definitely not just for engineers, there's a little something in there for all of us.
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Steuard
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Re: "Circuit Diagram" Discussion

Postby Steuard » Wed Apr 21, 2010 1:33 pm UTC

I'm not certain of this, but something about the tangle of wires in the lower left reminds me strongly of a maze in the Colossal Cave Adventure. Am I crazy? Am I in a maze of twisty little passages, all alike?

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Armadillo Al
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Re: "Circuit Diagram" Discussion

Postby Armadillo Al » Wed Apr 21, 2010 1:33 pm UTC

eviloatmeal wrote:Seriously though, this is definitely not just for engineers, there's a little something in there for all of us.

That's what some people are complaining about, apparently.

monkeyman8 wrote:I had to look up that brown blue orange = 16K resistance, I feel shamed :(

Also, am I the only one who thought "Brown blue orange" was from Ender's Game? (If I recall, the children found their way around the station by following three-color sequences that appeared on the walls.) Or was Ender's Game referencing the same thing?
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Re: "Circuit Diagram" Discussion

Postby endolith » Wed Apr 21, 2010 1:45 pm UTC

Is that squirrel on the right hand side related to the operational hamsterfier?

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Re: "Circuit Diagram" Discussion

Postby flag » Wed Apr 21, 2010 1:49 pm UTC

Brilliant. Just for complexity and variety this becomes one of my faves.

The Arena and the faux-resistor wire were my faves.

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ATCG
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Re: "Circuit Diagram" Discussion

Postby ATCG » Wed Apr 21, 2010 1:55 pm UTC

Needs a WOM.
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Re: "Circuit Diagram" Discussion

Postby endolith » Wed Apr 21, 2010 1:57 pm UTC

dwasifar wrote:Back in the day, I remember looking at one of them and seeing a symbol I didn't recognize; it was two intertwined wavy lines, with a callout and pointer saying "Gimmick." I compared it to the actual chassis, and in that spot in the circuit was a pair of insulated wires twisted together for about half an inch. I guess they needed just a little capacitance with no particular need for precision, and it was cheaper to twist wires together than use an actual capacitor.


http://en.wikipedia.org/wiki/Capacitive ... ng#Gimmick

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Re: "Circuit Diagram" Discussion

Postby djc6535 » Wed Apr 21, 2010 2:28 pm UTC

This.... On a Poster. Now.

DCB
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Re: "Circuit Diagram" Discussion

Postby DCB » Wed Apr 21, 2010 2:34 pm UTC

Quicksilver wrote:I also noticed this whole thing looks like it's designed to power a light bulb. Randall needs to play some gizmo's and gadgets, because this circuit isn't a bright idea.


Actually, right below the 1 ohm resistor blob there is a vibrator. So it's designed to power a lightbulb AND a vibrator. There's also a blender and another unnamed thing. Plus it supplies competitors to the arena.

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Re: "Circuit Diagram" Discussion

Postby tastelikecoke » Wed Apr 21, 2010 2:43 pm UTC

aaahhh! Reminds me of my tech preparations class! I always wondered what the ground sign is, I whonce thought it was a radio emitting end.

CH3 :D cloverleaf diamong intersection :D Holy water :o

they say holy water is granted with holy power that it has an extremely high (20m ohm) resistance.

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Plasma Man
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Re: "Circuit Diagram" Discussion

Postby Plasma Man » Wed Apr 21, 2010 2:46 pm UTC

Hang on... Looking at the scale, that blender is about a mile tall! (Don't even think about the vibrator :shock: )
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Re: "Circuit Diagram" Discussion

Postby grep » Wed Apr 21, 2010 2:46 pm UTC

I suspect the circuit diagram is actually the Faerie's Aire and Death Waltz, arranged for electronic components. Maybe if you connect the outputs to a speaker?

Here is a page with the waltz, linked below:

Image

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Thadlerian
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Re: "Circuit Diagram" Discussion

Postby Thadlerian » Wed Apr 21, 2010 3:01 pm UTC

I usually measure my Engineering degree progression by seeing how many xkcd jokes I get. I get at least a few of these ones, so I can't be all that bad.

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Re: "Circuit Diagram" Discussion

Postby cscott » Wed Apr 21, 2010 3:21 pm UTC


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dash
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Re: "Circuit Diagram" Discussion

Postby dash » Wed Apr 21, 2010 3:47 pm UTC

Best one in a long time.
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Re: "Circuit Diagram" Discussion

Postby bmonk » Wed Apr 21, 2010 3:53 pm UTC

phira wrote:Obviously, this circuit would never work without I-95 South eventually turning into 93 North.

Of course, the fact that it's actually a flux capacitor is also significant.

acheron wrote:
memcginn wrote:That may be why my favorite part of the diagram is "Not a resistor; wire just does this."


I laughed at that too.

Also I'm now picturing hot topless electrical engineer chicks wiring up a circuit. oh yeah.


Remember the doggerel that allows a correct English rhyme for "orange":

"The four engineers
wore orange brassieres."
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Re: "Circuit Diagram" Discussion

Postby LinuxTheKid » Wed Apr 21, 2010 4:10 pm UTC

grep wrote:I suspect the circuit diagram is actually the Faerie's Aire and Death Waltz, arranged for electronic components. Maybe if you connect the outputs to a speaker?

Here is a page with the waltz, linked below:

Image

http://www.youtube.com/watch?v=sCgT94A7WgI

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adaviel
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Re: "Circuit Diagram" Discussion

Postby adaviel » Wed Apr 21, 2010 4:42 pm UTC

Amazing diagram :)
And if we could harness the nerd-power of all the people who worked out the resistor values, we could really do something... hang on - Obama wants to go the the asteroids...

Re. magic smoke, the truth of course is that all electronics is powered by magic smoke. If the smoke gets out, the circuit will stop working, hence the "smoke test" - turn it on, and check for leaking smoke.
Once upon a time, I wrote test specifications for military electronics (where everything had to be testable, and tested, with a paper trail to prove it). For one piece of equipment the first test was "Switch unit on. Diode #1 shall not be ejected across the room." (On several units, an LED had been inserted backwards and tended to explode when voltage was applied).

Fry-kun
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Re: "Circuit Diagram" Discussion

Postby Fry-kun » Wed Apr 21, 2010 4:57 pm UTC

Anyone else notice that uni.xkcd.com doesn't work with this comic? I don't have time to investigate, but guessing the size has something to do with it (my browser window is 856x1680)

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Re: "Circuit Diagram" Discussion

Postby dwasifar » Wed Apr 21, 2010 4:57 pm UTC

monkeyman8 wrote:I had to look up that brown blue orange = 16K resistance, I feel shamed :(


I didn't, and it's due to a pungent mnemonic taught to me and the rest of my Basic Electronics class when I was a high school freshman.

0 - Bad (black)
1 - Boys (brown)
2 - Rape (red)
3 - Our (orange)
4 - Young (yellow)
5 - Girls (green)
6 - But (blue)
7 - Violet (violet, duh)
8 - Gives (gray)
9 - Willingly (white)

That should give you an idea of how long ago I went to high school. A public school teacher offering this mnemonic today would be flayed alive. But, for better or worse, it did stick with me, and as far as I know, Mr. Gene Spratt retired with his skin still attached.

Newto
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Re: "Circuit Diagram" Discussion

Postby Newto » Wed Apr 21, 2010 5:02 pm UTC

The only thing I see missing is a switch that is opened or closed instantaneously at t=0.

I especially like the ground, how deep is not too deep?

Okapi
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Re: "Circuit Diagram" Discussion

Postby Okapi » Wed Apr 21, 2010 5:02 pm UTC

jspenguin wrote:Anyone who laughs at the 666 timer is a nerd.


I'm a nerd.

clanders
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Re: "Circuit Diagram" Discussion

Postby clanders » Wed Apr 21, 2010 5:04 pm UTC

Looks like Randy wanted to put out a new poster.

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Re: "Circuit Diagram" Discussion

Postby RABBIDpanda » Wed Apr 21, 2010 5:16 pm UTC

It seems he forgot the canister of magical blue smoke.

onFyre
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Re: "Circuit Diagram" Discussion

Postby onFyre » Wed Apr 21, 2010 5:19 pm UTC

It's one of those things that gets a lot funnier the more you look into it.

Thing is, you'd need a pretty big tongue to link those nodes up.

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Re: "Circuit Diagram" Discussion

Postby RABBIDpanda » Wed Apr 21, 2010 5:23 pm UTC

dwasifar wrote:That should give you an idea of how long ago I went to high school. A public school teacher offering this mnemonic today would be flayed alive. But, for better or worse, it did stick with me, and as far as I know, Mr. Gene Spratt retired with his skin still attached.


A professor once alluded to a raunchy mnemonic, but refused to divulge it. Our closest guess was Big Bad ROY Goes Bananas Violent, Gay Wankers Go Silent.

Second best mnemonic of my academic career.

drow
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Re: "Circuit Diagram" Discussion

Postby drow » Wed Apr 21, 2010 5:33 pm UTC

but its missing the interociter component...
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Wnderer
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Re: "Circuit Diagram" Discussion

Postby Wnderer » Wed Apr 21, 2010 5:37 pm UTC

The most expensive chip is the Signetics 25120 Write-Only-Memory.

http://www2.vmi.edu/Faculty/squirejc/Re ... Memory.pdf

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Re: "Circuit Diagram" Discussion

Postby kps » Wed Apr 21, 2010 5:40 pm UTC

dwasifar wrote:That should give you an idea of how long ago I went to high school.

And if you learnt a less polite version in high school, you're either old enough to be dead, or went to school in Mississippi. (hint: ++duh)

There was also a "... behind Victory Garden walls" variant.

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Locoluis
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Re: "Circuit Diagram" Discussion

Postby Locoluis » Wed Apr 21, 2010 5:45 pm UTC

Max2009 wrote:I'm not sure whether it's good or bad that I didn't get all of the jokes in this one. But I did get the vast majority.
I'm not an EE, just a little geeky. I particularly like the weird units given to the elements in the diagram. (an 11 kg inductor, pi resistor, 8 mm resistor...)
But I'm not sure I got the holding pen and scarab beetles...

For those still trying to work it out, the arena is a reference to one of the Mad Max movies (I forgot which).


The scarab beetles must be the blue/gold, flesh-eating, biologically immortal kind. They're for making dung balls that are then fed to the rest of the circuit.

And to protect it from intruders.

This means YOU.
Last edited by Locoluis on Wed Apr 21, 2010 5:46 pm UTC, edited 1 time in total.
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Kalos
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Re: "Circuit Diagram" Discussion

Postby Kalos » Wed Apr 21, 2010 5:46 pm UTC

Another obvious poster grab.

Daver4100
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Where's Mr Fusion?

Postby Daver4100 » Wed Apr 21, 2010 5:49 pm UTC

The Flux Capacitor will never flux without the power of a Mr Fusion Home Fusion Reactor or equivalent.

~Dave

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Postby kps » Wed Apr 21, 2010 6:01 pm UTC

Can a squirrel's whisker be used in place of a cat's whisker?

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Re: "Circuit Diagram" Discussion

Postby kps » Wed Apr 21, 2010 6:05 pm UTC

Max2009 wrote:For those still trying to work it out, the arena is a reference to one of the Mad Max movies (I forgot which).

Two holes enter, one hole leaves.

daenku32
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Re: "Circuit Diagram" Discussion

Postby daenku32 » Wed Apr 21, 2010 6:10 pm UTC

leftsquarebracket wrote:
Doodle77 wrote:The answer is that the circuit bursts into flames because there's a 50V source with both sides connected to ground.

And a 240 VAC source connected to itself and the ground-side of the 50 VDC supply and the... I'll stop.

You are both discounting the effect of the flux capacitor. It creates a wave gradient that causes both sides to be off phase, creating a time-continuum resistor.


I think this is our ECE 255 final.

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Re: "Circuit Diagram" Discussion

Postby jrab » Wed Apr 21, 2010 6:16 pm UTC

I am wondering why noone saw this...... a reassessment is needed for anyone who thinks their a nerd....
lady.robot.PNG
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CorruptUser
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Re: "Circuit Diagram" Discussion

Postby CorruptUser » Wed Apr 21, 2010 6:39 pm UTC

pyroman wrote:Assuming I didn't mess anything up the resistor blob comes out to 1.3141 Ohms... And now that I have been adequately nerd sniped by Randall, I'm going to sleep. Night all.



Can't be; I see 2 distinct paths with 4 ohms, and 1 distinct path with 2 ohms. Not even including the extra resistors, 1/((1/4) + (1/4) + (1/2)) = 1. Therefore, the resistor mess must be less than or equal to 1 ohm.

exoren22
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Re: "Circuit Diagram" Discussion

Postby exoren22 » Wed Apr 21, 2010 6:48 pm UTC

TheoGB wrote:I don't really get it. But I like the UK-centric 240V AC.

That's all I've got.


Actually, it's not UK centric, as that's what high-voltage appliances run on in the US. Think laundry/dish washers, etc.

dwasifar
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Re: "Circuit Diagram" Discussion

Postby dwasifar » Wed Apr 21, 2010 6:59 pm UTC

exoren22 wrote:
TheoGB wrote:I don't really get it. But I like the UK-centric 240V AC.

That's all I've got.


Actually, it's not UK centric, as that's what high-voltage appliances run on in the US. Think laundry/dish washers, etc.


Where do you live that your washing machine and dishwasher are 240? Mine are both 120. The only things in my house that run on 240 are the oven and the central air.

Or were you talking about commercial appliances?

BlissfulRhythm
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Re: "Circuit Diagram" Discussion

Postby BlissfulRhythm » Wed Apr 21, 2010 7:10 pm UTC

Only three resistors in that mass have been specified, so it's impossible to solve without making wild assumptions.


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