Electrical Engineering

vvavepacket

00:00

tnx coding, i feel like, i want to start one. but dont know how. ok lets keep waiting :)

@coding_corgi the time in ur place is?

coding_corgi

@vvavepacket EST (Eastern) / New York (but I am not in NY)

vvavepacket

same time zone as I

coding_corgi

@vvavepacket That's nice, it's easier talking to people that way...

vvavepacket

r u an undergrad?

coding_corgi

@vvavepacket No, a lot younger,

@vvavepacket What do you mean by: "...i feel like, i want to start one..."?

vvavepacket

00:05

i want to create high grade papers like others do in the scientific/ee community

i think u are getting a lot of exposure at your age. thats great

ee / coding stuff

coding_corgi

@vvavepacket Still don't know what you mean by that,

@vvavepacket Yeah, thanks, are you in college/high school

vvavepacket

college junior

yr

coding_corgi

@vvavepacket hmmm...

@vvavepacket ?

vvavepacket

college incoming senior student

coding_corgi

@vvavepacket ?

vvavepacket

00:11

yes coding

im in college

coding_corgi

@vvavepacket What do you mean?

vvavepacket

u know college has 4 yrs right. im in the 4th yr

coding_corgi

@vvavepacket Yes, I meant, what do you mean by:

5 mins ago, by vvavepacket

yr

vvavepacket

oh, it was supposed to be ' college junior year'

hit the enter key too early.. sorry

coding_corgi

@vvavepacket oh

@vvavepacket You can edit your msgs

vvavepacket

00:13

oh. i didnt know tht

coding_corgi

@vvavepacket Mouse over your message and a arrow button pops up, click that and hit the edit button, OR select the textbox, then hit the up key to select your message

@vvavepacket Though there is a time limit to edit msgs

vvavepacket

message edited

there you go.

:) tnx

coding_corgi

@vvavepacket your welcome, what are you studying in college

vvavepacket

computer engineering

coding_corgi

@vvavepacket Hmmm... Like what do you do in general at a class

vvavepacket

00:18

you take courses related to computer, electrical and electronics

and then you get to have a thesis to apply what ever you learn on your final year

coding_corgi

@vvavepacket Oh, do you by chance know some stuff about the Wii, going to see if I can reprogram it,

vvavepacket

unfortunately I dont

r the guy who speaks about arm. building wireless routers?

coding_corgi

@vvavepacket Oh, thanks though,

@vvavepacket I wish I was into ARM, I am into AVR, since I am trying to learn C++ I thought it would be a great combination

@vvavepacket I want to build cool stuff like that, someday...

@vvavepacket I am wondering if there is a micro sd card with the runtime stuff, etc. so I can check it out, modify it, edit, etc, since I don't game anymore

vvavepacket

what do u mean by '' I am wondering if there is a micro sd card with the runtime stuff, etc. so I can check it out, modify it, edit, etc,

The Photon

@vvavepacket At your school, can you work with a professor on a research project?

vvavepacket

00:23

@thephoton, yes.

coding_corgi

@vvavepacket If you roll over a message, you can see what the msg is replying to, (I meant on the Wii)

The Photon

Even if there's no formal program to do that, you can always just go talk to a prof about it. Are there any prof's doing research you'd be interested in working on?

vvavepacket

ohh

hmm, hw about a unsupervised research?

whats ur opinion about it

welcome back rawb

coding_corgi

@rawbrawb do you know anything about the Wii's runtime?

The Photon

@vvavepacket It would be very challenging ... Prof's know a lot about what kind of results are likely to be accepted for publication, how to write a paper in the right style, ...

If you have a really good idea, you can probably find a prof to give you just very nominal supervision, not really meddle in what you do.

vvavepacket

00:29

tnx photon

The Photon

But they can also help out a lot --- find equipment resources, give advice on writing when you get to that point, etc.

coding_corgi

It's strange how @!rawbrawb joins the room, but doesn't talk

The Photon

I'm out.

coding_corgi

@ThePhoton Wait, do you know anything about Wii's runtime?

coding_corgi

01:13

@vvavepacket Are you still here?

vvavepacket

yes coding

im here

coding_corgi

@vvavepacket Ok, I was just bored, taking screws out of my Wii, whatcha doing?

coding_corgi

01:46

@anorton Yo!

anorton

yo.

vvavepacket

studying fpga

coding_corgi

@anorton Whatcha doing?

anorton

Waiting... I'm about to watch a DVD with the rest of the people in my family, but I'm waiting on them... :)

coding_corgi

@anorton :] What are you going to watch? The Matrix?

anorton

01:52

No... actually, I was going to watch Monk.

Watching that show is probably bad for me... I pick up OCD traits when doing so.

coding_corgi

@anorton Monk! I love Monk! And Psych

@anorton :] Don't worry, I have extreme cases of OCD, at least it's better than Monk's, I'd hate to be that way

anorton

Psych is cool, but I like Monk a bit better...

He's more of who I'd like to be... :P

Ok... g2g. Everyone just got ready! :D

coding_corgi

@anorton Ha ha! I see why I like to watch Psych, I like to wing things...

@anorton See ya! :]

rawbrawb

02:17

@coding_corgi none what so ever

coding_corgi

@rawbrawb Huh

@angelatlarge Yo!

rawbrawb

03:05

@coding_corgi You asked me a question, I answered it. If you want to trace back the originating link click on the arrow on the left hand side . In this case in front of the @

angelatlarge

04:08

Hello all.

Looks empty though...

Anindo Ghosh

04:32

@jippie That's an MSOP10 not a DIP10. For a moment I was intrigued.

Anindo Ghosh

04:51

grEEtz all

@coding_corgi The Mono runtime is a run-time library for a C# clone compiler, open source.

angelatlarge

@AnindoGhosh Hello dear leader

Anindo Ghosh

@angelatlarge Not empty, it never really is. We always have at least one ghost reading this chat, though he can't join it I believe.

@angelatlarge Hi :-)

angelatlarge

@AnindoGhosh Are you speaking literally or metaphorically?

Anindo Ghosh

@angelatlarge Any way you want to look at it ;-)

angelatlarge

@AnindoGhosh Right

@AnindoGhosh Actually, I think there is no way of preventing someone from joining, no? It is just that speaking requires priviledges.

Anindo Ghosh

04:56

@angelatlarge Hmm I think you are right

angelatlarge

@AnindoGhosh In that sense, is there a danger of making the "ghost" larger than life? He is like Stalin/god: omnipresent and omniscient, at least in some sense sense of the latter word...

Anindo Ghosh

@angelatlarge Sometimes people are just unwell, and are best left to their own means unless they disrupt others' lives. I try to be as tolerant as possible because I know one person close to me, who has such issues.

brb

Anindo Ghosh

05:11

back

PeterJ

05:58

@AnindoGhosh, you do a bit with contract PCB manufacture / assembly don't you?

Anindo Ghosh

@PeterJ I use a local manufacturer / fabber yes.

PeterJ

@AnindoGhosh, I was just wondering in India to get 1000 pieces of a PCB made & assembled (ignoring BOM) what something virtually identically to the following would cost, double-sided but only components on top, 0603 parts and IC pitch is TSSOP.

Anindo Ghosh

@PeterJ Can you give me an estimate of the number of soldered points? Also, is the battery holder through hole? For that matter, is there any through-hole part at all?

PeterJ

@AnindoGhosh, no through-hole, I think soldered points will be around 80

Anindo Ghosh

@PeterJ For the actual board etch/route/v-score/drill, you can make your own estimate by visiting PCBPower, one of the local manufacturers that we use... You'll have to register, then you can put in your parameters and they'll provide a figure.

jippie

06:05

@AnindoGhosh I con;dn't tell from the image

good morning @all

PeterJ

@AnindoGhosh, thanks I've made a note of them. Any hints on a good place to try for assembly? Hi @jippie

Anindo Ghosh

@PeterJ For hand-soldering each board, it would cost you around $0.54 per board from the assembler I use, plus parts of course.

@PeterJ If you want automated assembly, then there's a minimum set-up fee of $360 or so (bulk of which is the laser cut steel stencil), which should cover about 500 boards (assuming the boards are around 2 sq cm each), add another $100 per additional 500 boards.

@PeterJ Does that fully address your question, or am I missing some part?

@jippie :-) Good morning.

PeterJ

@AnindoGhosh, thanks :-). It's for a little alarm project I actually thought of about 10 years ago but it's really only now things have got low-power and cheap enough to make it small and cheap enough to be practical. Those automated costs are about half the cost of here, manual even more so. Thanks for your help.

Anindo Ghosh

@PeterJ Yes, but those automated costs are not regular price: I have a relationship, and they basically run my orders as part of surplus capacity. Normal automated assembly works out pretty much the same as US prices.

@PeterJ Also, note that I haven't mentioned the bed-of-nails and automated testing: Those are actually more expensive in India. Manual testing, just add 5 cents to each board, if there is a simple pass-fail test possible.

PeterJ

@AnindoGhosh, ahh OK thanks. Anyway development will take a while but I I'll go ahead, those numbers give about the $5 cost I'd hope for so they could be sold retail for about $10 a piece. When I first looked at the project way back it was more like $40 all up.

Anindo Ghosh

06:21

@PeterJ Good luck. You should also consider getting the boards done at iTeadStudio in China and shipped to India for assembly, that may save you some bucks.

PeterJ

@AnindoGhosh, thanks just made a note of them. Now just need to get back into the PIC swing, been years since I've used them but they have a part perfect for this app.

Anindo Ghosh

@PeterJ Also look at the ATTiny series of processors, there might be something there too.

PeterJ

06:36

@AnindoGhosh, trust me it was a last resort ;-). It's one of the PICs with integrated RF and covers the frequencies I want. Actually while I prefer the AVR instruction set / toolchain one good thing about Microchip is they maintain product availability for a long time after they are not recommended which will be good for something like this. In fact I think Atmel did have ISM devices for a while that disappeared pretty quickly?

Anindo Ghosh

@PeterJ ... wait, RF? Have you looked at the TI offerings at all? They are currently kings of cheap low-power RF integrated MCUs, I believe.

PeterJ

@AnindoGhosh, looked at them a while back. They look impressive but I only need a transmitter (at the remote end) and no protocol stack, the PIC devices are only around $1.20 in volume and don't need hardly any external support circuitry.

Anindo Ghosh

@PeterJ Fair enough.

jippie

someone mentioned ATtiny?

abdullah kahraman

@jippie shh

PeterJ

06:46

@jippie, does that make your browser light up lol? Anindo was asking if I'd looked at one but as above I'm only using a PIC because the RF capabilities match what I need.

jippie

@PeterJ I'm sure @CamilStaps would know how to make that happen, but I have no idea where to start.

abdullah kahraman

Shiny, ha?

PeterJ

@jippie, I've used PICs in the past a fair bit but one thing I do need to work out is a compiler to use. That's one good thing about AVR - the free and rock solid GNU based C compiler. There was a question somewhere recently that mentioned a good free PIC compiler I'll have to track down.

jippie

@PeterJ the boy will probably know it

PeterJ

Either that or just use the Microchip C compiler, it'll probably be done in 30 days and then if successful don't mind buying a copy.

jippie

06:51

@abdullahkahraman nice picture you found on google, what's up with it?

abdullah kahraman

@jippie Ahem, Freescale

angelatlarge

@PeterJ Some people called it "made by amateurs" though.

Time to go to bed.

Good night all

PeterJ

@angelatlarge, lol. Good night.

jippie

@angelatlarge night

@angelatlarge if that is the best argument they can come up with ...

PeterJ

@jippie, just had a look and the Microchip / Hi-Tech Lite compiler is free. Missing a few optimizations but that won't matter for what I'm doing.

abdullah kahraman

07:08

@angelatlarge Bye bye

@PeterJ Nooo! It is too 2000 and late lol

@PeterJ Use XC8 if you are working with 8-bit.

PeterJ

@abdullahkahraman, thanks for the hint, even if you did make me feel old ;-)

abdullah kahraman

@PeterJ Don't worry, you may be old, but you are not alone

2

@PeterJ You have @jippie, @AnindoGhosh and lots of others that you will drink coffee with and chat about how new agers behave :)

Anindo Ghosh

@abdullahkahraman You forgot @rawbrawb and of course the bearded one.

jippie

isn't @kortuk like 53 or so?

abdullah kahraman

@AnindoGhosh lol, I did not want to ping him, maybe he would grunt at me

@jippie Reverse those digits!

Anindo Ghosh

07:15

@abdullahkahraman Not all of us are insufferable old fools, you know.

abdullah kahraman

@AnindoGhosh lol, aren't you?

jippie

@AnindoGhosh not all

Anindo Ghosh

@abdullahkahraman I might be, but not all of us are.

abdullah kahraman

You guys are cool, I don't feel any age barrier at all.

Anindo Ghosh

@abdullahkahraman It's like diodes, the barrier is unidirectional ;-)

abdullah kahraman

07:17

@AnindoGhosh That deserves a star, lol

jippie

It isn't me! intodns.com/byethost12.com <= that shows the reason why I can't access pdp11.byethost12.com/AVR/ArduinoAsProgrammer.htm most of the time. (cc: @yogece )

Missing nameservers reported by parent

abdullah kahraman

07:44

When I finish my masters, what could I write to my business card as my title?
Electronics Engineer M.Sc.Eng ?

jippie

08:34

@abdullahkahraman making-it-happen'er

abdullah kahraman

Yay! Found a new channel on YouTube about electronics:

youtube.com/user/gezzasw

abdullah kahraman

09:10

What does Q2 do in this circuit?

jippie

10:09

@abdullahkahraman current sink or source, depends on how you want to see it

if Q1 isn't conducting, it 'shorts' G to D

jippie

10:28

seems to act like a pull up ~~resistor~~ current source

abdullah kahraman

12:06

@jippie Why not simply put a pull-up resistor?

@jippie Btw, IRF540 is an N-Channel MOSFET.

jippie

limit current for the 30V supply and at the same time have a relatively high current to discharge the MOSFET's capacity.

abdullah kahraman

@jippie I don't get it, could you explain more?

Anindo Ghosh

This tango-tango is getting on my nerves with his totally ill-researched questions.

PeterJ

@AnindoGhosh, dance around and do the tango to relieve the stress, but make sure to take a video :)

abdullah kahraman

@AnindoGhosh @PeterJ Could you explain what is Q2 doing in the above schematic? @jippie told me it limits current, discharges MOSFET's capacity and acts as a pull-up current source. But I don't get any of these?

PeterJ

12:25

@abdullahkahraman, I'm not sure what it does but at least I can admit it. @jippie probably just made it up to sound smart ;)

abdullah kahraman

@PeterJ lol

jippie

@PeterJ shoot, after 9700+ rep you guys are finally up to me.

sorry @abdullahkahraman, I have limited time right now.

abdullah kahraman

@jippie Sure, thanks

Anindo Ghosh

@abdullahkahraman No, I have no clue. Sorry.

abdullah kahraman

@AnindoGhosh Thanks.

jippie

12:41

make it a question on the stack ;o)

Anindo Ghosh

How does a person expect to buy a bare IC and make it talk directly to a PC? Or, converse question: Why do PCs not yet have a contact-free mind-reading (or for ICs, processing reading) interface?

0

A: Can i directly connect this chip to PC and how can i amplify it (NRF24L01)?

No, the IC cannot be directly connected to a PC, as it does not have any means of communicating with the PC through any of the standard interfaces the typical PC supports. Please also note that the particular IC linked in the question is clearly indicated as obsolete on the manufacturer's page: ...

jippie

@abdullahkahraman and trolling is more fun

Anindo Ghosh

Troll alert:

user24313

1

abdullah kahraman

@AnindoGhosh Why do you even bother to answer? For me to upvote?

Anindo Ghosh

@abdullahkahraman Because there are other newbies who will expect the same magical ability to plug an unrelated IC into a PC and make things happen.

abdullah kahraman

12:57

@AnindoGhosh That is a big fantasy world of these guys lol

jippie

@AnindoGhosh not sure

Anindo Ghosh

@abdullahkahraman Well, we can either ridicule them, "tar and feather them and run them out of town", or try to help them understand which end is up. I try not to do the first too often, doing the second is for people with really sad lives and poor social skills, so that leaves the third.

Need food.

BRB

jippie

@AnindoGhosh please add a forth option, one for having a bit of fun :-)

Anindo Ghosh

@jippie hmm, that too :-D

@jippie Don't you think this question deserves to be reopened? My view is that it got closed because people assumed it was not feasible - due to not being familiar with the NetDuino for one thing.

-1

Q: Controlling Microcontroller using Visual C#

I want to control some motors from the Microcontroller but I want to control the Microcontroller from the computer using C# or at the very least get some feedback to the computer How can I do that ? I'm planning to use Atmel AVR microcontroller to control an ROV

microcontroller motor robotics

jippie

@AnindoGhosh I'm not sure what exact problem the OP has.

The answer I wrote feels too trivial to be a good answer.

I think there is something else.

Anindo Ghosh

13:12

@jippie They want to manipulate the device in C#, presumably because that is the language they are most familiar with.

jippie

I understood C# on host side

not client side

so what is the problem? I control my controllers from Perl equally well.

Anindo Ghosh

@jippie Your answer is a subset of the solution: It is just communication, what they probably want to do is something like a custom LabView thing on the PC to manage the device

jippie

I mean, it doesn't matter

Anindo Ghosh

@jippie It does in the following way: If they could also program the device side in the language they are most familiar with, that would increase their productivity.

jippie

@AnindoGhosh I think the question should be more clear in that respect. You mean like more information about a robust protocol?

Anindo Ghosh

13:14

@jippie No, protocol doesn't matter. They want to use a C# compiler at either end, is my reading.

jippie

didn't read it that way.

Anindo Ghosh

@jippie I'm doing a decode based on interactions with other C# folk getting into electronics, over the years.

jippie

and who in his right mind would want .net on a microcontroller anyway ;o)

Anindo Ghosh

@jippie No reason not to have one. The netDuino does, plus there is the .net micro effort which has done decently well so far, and then there is the whole mono open source .net platform which is being ported to various MCUs.

@jippie Don't forget, a few years ago, the Parallax Stamp, running BASIC of all languages, was one of the most successful beginner MCU platforms out there.

jippie

@abdullahkahraman D3 allows the comparator to influence the base of Q1 only when it is pulled low. The comparator output is pulled low only when the inverting input is higher than V_REF. This means the comparator and Q1 form a shutdown switch. Once you realize this, it is also trivial to see that the shutdown input forms a wired or through D5. So base of Q1 is pulled high through R3 or pulled low through D3 or D5. When it is pulled high, Q1 will close.

PeterJ

13:22

I'm going to prepare a few tasty snacks and go to bed, catch you all soon

jippie

@abdullahkahraman Q2/LED D4/R4 form a current source/sink of about (1.7-0.7)/100 = 10mA

when Q1 is not conducting, Q2 will pull Q3's gate to Q3's Drain (30V) with a maximum of 10mA until the Q2 saturates

@AnindoGhosh never liked the basic stamps, nor picaxe

Anindo Ghosh

@PeterJ sleep well!

jippie

@PeterJ night

Anindo Ghosh

@jippie Personal likes or dislikes, like religion, have limited merit in technology.

jippie

however when connecting a 100 ohm reistor directly to Q3's gate, and you want to shut down the power supply, you have to sink 30V/100E=300mA, which is a bit steep for a logic input.

and the resistor will dissipate 30V²/100E = 9W.

@abdullahkahraman Q2 just limits the current in the shutdown situation.

It wouldn't surprise me is the comparator is forced in linear operational mode, so you get a proper control loop for the output voltage

@AnindoGhosh We live in a free world, I can like my AVR's and dislike PICAXE and .NET :o)

abdullah kahraman

13:31

@jippie Oh, thank you a lot. I get it now!

Anindo Ghosh

@jippie Absolutely... which doesn't make it irrelevant as a technology - only irrelevant to you.

jippie

@AnindoGhosh anyways, I thnk it can be a good question if it is more clear what the actual question is. I don't mind open-voting it when it gets better.

abdullah kahraman

I was ignoring that LED all the time, thanks @jippie!

jippie

so I typed for 15 minutes and I only had to mention: "Did you notice the LED?"

Anindo Ghosh

@jippie That's fair enough. Maybe I should try suggesting an edit.

abdullah kahraman

13:33

@jippie Yeah, sorry :(

jippie

@AnindoGhosh I think this is a typical situation where the OP has turned all grumpy and can't be bothered to improve his question (or even realizes that it should work that way).

abdullah kahraman

@jippie I appreciate your effort. Also, if you didn't mention that logic disable function I may not be able to understand, too.. So, it is not the LED only :)

jippie

@abdullahkahraman So where does that leave my rep?

abdullah kahraman

@jippie I am going to give your rep for your effort, now :)

jippie

stepping in the shower.

Anindo Ghosh

13:36

@jippie No, OP did edit the question based on the comment about which MCU they were planning to use.

jippie

14:04

@abdullahkahraman or the control loop acts like a PWM modulator

abdullah kahraman

@jippie No, it is in linear region, as writer says in Part 2 of his series.

How do I obtain (s^2)/(s + 0.383 + i*0.924) transfer function with opamps?

David Kessner

Hi all.

abdullah kahraman

@DavidKessner Hey!

Anindo Ghosh

@DavidKessner hiya

David Kessner

What's up this morning?

jippie

14:23

@DavidKessner the sun?

coding_corgi

14:41

Yo yo yo!

@jipppie Yo!

abdullah kahraman

@coding_corgi y0

abdullah kahraman

14:53

@AnindoGhosh Hahhah! "English."

@AnindoGhosh You are editing my posts faster than me.

Anindo Ghosh

@abdullahkahraman It's my standard note on such edits, please don't take it personally. It doesn't mean you don't know English, it means I did some English related changes.

jippie

I'm going to try something new today!

2

Anindo Ghosh

@jippie I did that yesterday.

jippie

I'm going to actually do some cooking

Anindo Ghosh

@jippie Keep the webcam on and give us your local fire control phone number, so we can dial when we see the flames.

Why is this answer of mine not getting any love?

abdullah kahraman

14:57

@AnindoGhosh Oh, OK, lol

Anindo Ghosh

1

A: Stable voltage and current source

For a temperature compensated, high precision voltage source, the LM317 is not the way to go. It is a very basic voltage regulator, of ancient design, about as viable to electronic designers today as the LM741. They serve at best as teaching tools, preferably to teach what not to use. Further, a...

abdullah kahraman

Why is this question of mine not getting any attention?

0

Q: How to realize this transfer function with OP-AMPs?

This is a homework question. I know that: Given a transfer function of \$H(s)\$ below, we can realize it with an OP-AMP as follows. \$H(s)=-\dfrac{2}{s+2}=-\dfrac{\dfrac{1}{2}}{\dfrac{s}{4}+\dfrac{1}{2}}=-\dfrac{Zf}{Zi}=-\dfrac{\dfrac{Rf}{Rf*s*Cf}}{Rin}\$ where \$Rin=Rf=\dfrac{1}{2}\Omega\$, \...

op-amp transfer-function

Anindo Ghosh

@abdullahkahraman Would "Because I don't know the answer" sound familiar to you? :-)

abdullah kahraman

@AnindoGhosh lol

Anindo Ghosh

@abdullahkahraman I would still have upvoted it (maybe) except that I'm out of votes for the next 8 hours.

abdullah kahraman

14:59

@AnindoGhosh Wow, why does that happen?

Anindo Ghosh

@abdullahkahraman Because there is a maximum number of times one can vote per day. I max this out almost every day.

jippie

@AnindoGhosh same reason mine don't

abdullah kahraman

@AnindoGhosh Wow, you are generous, not like a gray-bearded I would know.

Anindo Ghosh

@jippie Dude, you got at least 4 upvotes from me today, maybe 3-4 yesterday. You're responsible for my running out of votes daily!

jippie

@abdullahkahraman poor research? :-p

abdullah kahraman

15:01

@jippie Man, I could not find anything :(

coding_corgi

@jippie HA HA!

jippie

at least 4 upvotes!? so tomorrow a rollback :-(

Anindo Ghosh

@abdullahkahraman Not generous at all. I vote only when I find something strongly worth voting for, up or down. It's just that I also look at old questions and answers all the time, so totals add up.

jippie

@AnindoGhosh Because it is too long to read

Anindo Ghosh

@jippie Well, if that happens let me know and I'll be very careful about counting my jip-votes.

abdullah kahraman

15:03

@AnindoGhosh Well, at least you upvote and give value to answers too, unlike some gray-beards who only downvote..

jippie

µA723 is at least 25yrs old too, at least here in europe.

coding_corgi

@AnindoGhosh Sure...

Anindo Ghosh

@abdullahkahraman Like I said about someone else earlier today - Some people are unwell, we need to accept that and as far as possible work around it :-D

jippie

right cooking

user61389

Hullo

abdullah kahraman

15:05

@AnindoGhosh Wow didn't know that a word "unwell" existed!

@CamilStaps Hi!

Anindo Ghosh

@jippie Oh absolutely. It's got better stability than the 317, though... and it's available at some ridiculous 10 Rupees each in retail, 5 Rupees in lots of 20 or more.

@abdullahkahraman It's the opposite of that hole in the ground where you get your water from. :-)

user61389

@jippie sounds like fun :)

abdullah kahraman

@AnindoGhosh Yeah, yeah, totally :)

rawbrawb

@abdullahkahraman you seem to be missing an addition here

abdullah kahraman

@rawbrawb oops, a +1

@rawbrawb Thank you!

rawbrawb

15:11

@abdullahkahraman I have a question for you ....

what does "s" represent?

mathematically

abdullah kahraman

@rawbrawb I don't know Laplace Transforms, I should admit.

@rawbrawb But here, s=jw, I guess?

rawbrawb

@abdullahkahraman and w = ?

abdullah kahraman

@rawbrawb w=2*pi*f where f is frequency

rawbrawb

@abdullahkahraman so in that equation you have f^2 correct?

abdullah kahraman

@rawbrawb In the second one?

rawbrawb

15:14

@abdullahkahraman you have R*s*C*f <- where does that second f come from?

you already have an implicit f in the S

abdullah kahraman

@rawbrawb Oh, that is sub-character, Cf like C1 or C2

rawbrawb

@abdullahkahraman Ooooh sorry.

user61389

@abdullahkahraman you might want to fix some other subs as well :)

abdullah kahraman

@rawbrawb I have to say sorry, actually. I did not made them \$C_f\$ because it looked so small and hard to read.

@CamilStaps There comes TeX police lol

rawbrawb

@abdullahkahraman I was in there editing for you and then you started so I backed out.

user61389

15:17

@abdullahkahraman sorry ;)

abdullah kahraman

lol

coding_corgi

@abdullahkahraman Ha ha!

anorton

Just a side note regarding TeX: Over on the Math site, since we use TeX so much (even in chat), one of the regulars made a bookmarklet that renders MathJax code: meta.math.stackexchange.com/questions/1088/…

3

(some of you guys may find it useful)

user61389

That's great.

coding_corgi

@anorton Yo

anorton

15:24

Hello

abdullah kahraman

@anorton Thanks for that!

$$C_f=1F$$

Wow, it renders!

\[R_{in}=\dfrac{1}{2}\]

anorton

Yep. :) It's pretty useful, especially for some of the weirder stuff:
$$\mathcal{E} = -\frac{d\Phi}{dt}$$

abdullah kahraman

user61389

Awesome, it works! :)

abdullah kahraman

@anorton I hate magnetics and other RF :) And that is because I am too dumb to understand them :)

anorton

15:33

:D

Kortuk

@abdullahkahraman Ha, I am not 35 either.

abdullah kahraman

@Kortuk You are no way more than that!

@Kortuk Silly us, your profile tells the truth :)

Kortuk

@abdullahkahraman :)

reverse is closer, but I am younger.

Anindo Ghosh

@jippie I added the cheapest low tempco Micrel LDO I could find to my answer. 40 ppm/degree C, compared to the LM317's 200 to 300 ppm/degree. Is that an improvement over the 50 to 100 ppm ancient part you didn't like? :-)

jippie

I think it actually helps when you know what burrito's should look like before attempting to make them ...

@AnindoGhosh didn't say I don't like them

Anindo Ghosh

15:42

@jippie They look black and well-burnt, and have a delicious smoky flavor. I'm sure you did well making them. :-)

coding_corgi

@jippie Ha ha! Too bad you guys don't have Chipotle in Holand

jippie

how does this MathJax help us discuss $$\beta\epsilon\varepsilon\mathbb{R}$$

2

?

abdullah kahraman

@jippie lol

jippie

$\tag{1}$

The Photon

16:05

@coding_corgi I like Chipotle, but Chipotle should not be the source of your "reference burrito".

The "reference burrito" should come from a shop where you are the only person there who speaks English.

anorton

@ThePhoton what is this heresy you are saying? :)

Kortuk

@ThePhoton seconded.

anorton

I've had burritos from that shop before, and they were nothing like Chipotle. Of course, that was only one attempt...

Kortuk

@ThePhoton That is offensive, many people in Texas have learned basic English. Should come from a shop where I am the only one that speaks English fluently

The Photon

@Kortuk I didn't say you're the only one there who can speak English.

jippie

16:08

hey @Kortuk how is you?

Kortuk

@ThePhoton ha.

@jippie Crazy busy, back upstairs I go, thought I would say hi.

jippie

@Kortuk family and you OK?

abdullah kahraman

@Kortuk Seems like all his nerdy stuff is in his basement :)

jippie

I didn't really worry because I saw him online. If people are online they must be OK.

abdullah kahraman

@jippie If people are online, their computers are OK :)

2

David Kessner

16:12

@jippie I thought that everyone on the internet were jerks (using the nice word since there are pre-schoolers around).

jippie

so?

The Photon

@DavidKessner They're OK jerks.

abdullah kahraman

Quoted from a PDF:

Richard Feyman (Nobel QED) liked the equation
$$e^{j\pi}+1=0$$
because it tied together 0, 1, e, j, pi.

What a nerd :)

David Kessner

@ThePhoton Oh, that makes all the difference in the world! :)

jippie

@abdullahkahraman so we can calculate j from that.

The Photon

16:19

@jippie pi * ln(-1) ?

jippie

hush

@ThePhoton don't even think of finishing that sentence.

abdullah kahraman

@jippie hahahaha

coding_corgi

@ThePhoton Are you sure, I mean they are one of the biggest retail burrito people in the US, what are you thinking Taco Bell?

The Photon

@coding_corgi hahaha

anorton

actually... it should be: $$j=\frac{\ln(-1)}{\pi}$$
However, from my understanding, the $\ln$ function is multi-valued in the complex plane, so this may assume that you're taking the principal root? (perhaps--I don't really know)

abdullah kahraman

16:22

@anorton Exactly.

The Photon

@anorton Sorry I am not MathJaxing in chat...I read the backslash pi as divided-by-pi and followed through without thinking about it.

coding_corgi

@ThePhoton I'm not joking around. I am serious.

abdullah kahraman

59 mins ago, by anorton

Just a side note regarding TeX: Over on the Math site, since we use TeX so much (even in chat), one of the regulars made a bookmarklet that renders MathJax code: http://meta.math.stackexchange.com/questions/1088/should-chat-have-tex-support/3297#3297

@ThePhoton Or, go to here: math.ucla.edu/~robjohn/math/mathjax.html

This is the new trend, lol

jippie

a non-MathJax chat is soooooooo $$23^{rd} of May\ 2013$$

6

The Photon

@coding_corgi Ohio might not be the best place to look for the National Standard Burrito.

abdullah kahraman

16:24

I have to go, bye all!

user61389

@abdullahkahraman later

Anindo Ghosh

16:42

@abdullahkahraman Bye!

coding_corgi

16:56

@ThePhoton Really? We have plenty of delicious Mexican food up here....

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