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We're recovering from a major server loss and are restoring backups as we gain access to them. Don't mind the odd time warp. Warn us in the future.

circtuit problems by Charles Sattingfene - Mon, 14 Jul 2014 01:34:00 EST ID:XObDUDiZ No.6399 Ignore Report Reply Quick Reply
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I posted here a couple of months ago that I was creating an automated sprinkler system, but I'll keep this brief. I'm running a DC solanoid valve and a relay switch using an Arduino from my computer. The Ardiono cannot power either device directly so it switches the device indirectly via a NPN transistor. The 9V batteries can power both devices sufficiently. The diode is a to neutralize any kickback in the coils (both the valve and the relay have coils so I'm using the same circuit design for both of them). I had the relay and valve turning on and off every 5 seconds to test them but then they stop doing this after a minute. I replaced the diode and that solved the problem for about a minute but then it stops working again (I think current is building up and gettting trapped somewhere but I don't want to remove the diodes). Is there any electronics whizz who can help me solve this riddle and stop the electical buildup or whatever it is causeing this?

I got the schematics from here using their design but I think there is something wrong and I can't figure it out . http://www.instructables.com/id/Controlling-solenoids-with-arduino/

Here are the design schematics im
Jarvis Trotridge - Thu, 17 Jul 2014 08:13:15 EST ID:gKi6WIvM No.6401 Ignore Report Quick Reply

Okay not really an electrician but by the sounds of it you're destroying the diode.

Is the diode in reverse or forward bias?
Is there anyway to lower the voltage?
Have you tried using Zener diode instead?
Ebenezer Dettingford - Mon, 21 Jul 2014 00:27:35 EST ID:XObDUDiZ No.6415 Ignore Report Quick Reply
Oh can you tell me how to put a capacitor in my circuit? I think this harmonizing is exactly what is happening but I don't know enough about electronics to know how to cancel something out or integrate a pendulum into my circuit.

Electromagnetics by Rodrick Hughes - Sat, 19 Jul 2014 17:30:54 EST ID:ppVBLVzM No.6410 Ignore Report Reply Quick Reply
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if emf=Work/charge and voltage=change in potential energy/charge and Work= -Change in Potential energy then does emf=-V

Sorry if this is a dumb question. My professor was using emf and voltage interchangeably but the definitions are emf=W/q and V=delta U/q so...

Pic unrelated
Rodrick Hughes - Sat, 19 Jul 2014 17:33:02 EST ID:ppVBLVzM No.6411 Ignore Report Quick Reply
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Fuck, just saw that this particular board is "work-safe" immediately after posting. Sorry guise....Plz don't n00b-hax-slash-ban me, IT WONT HAPPEN AGAIN! I PROMISE

Cool Tools by Whitey Clundlefed - Fri, 18 Jul 2014 22:32:05 EST ID:jvdtbojL No.6405 Ignore Report Reply Quick Reply
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So I was at work today and I found this weird, for lack of a better term, multi-wrench. Sorry the picture is shit, I was in a hurry. I have a picture of the box which I'll post as well. Google has done me no favors in finding places where I can buy this kind of thing.
Whitey Clundlefed - Fri, 18 Jul 2014 22:33:56 EST ID:jvdtbojL No.6406 Ignore Report Quick Reply
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Whitey Clundlefed - Fri, 18 Jul 2014 22:36:00 EST ID:jvdtbojL No.6407 Ignore Report Quick Reply
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I managed to buy another multi-tool, just to give some context on the kind of goofy yet useful stuff I'm looking for

Future Innovashuns by Polly Murdstone - Fri, 28 Feb 2014 16:43:10 EST ID:sKoRRU+w No.6166 Ignore Report Reply Quick Reply
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What are some interesting technological developments to arrive in the near future?
Also let's consider the implication thereof
I'm bittersweet about driverless cars, I recognize the value, but that's how many jobs gone?
5 posts and 3 images omitted. Click Reply to view.
Phoebe Niggleson - Thu, 13 Mar 2014 05:32:44 EST ID:XObDUDiZ No.6211 Ignore Report Quick Reply
what is the benefit of having a tokamak?
Sophie Caddlecocke - Thu, 13 Mar 2014 06:58:24 EST ID:SlDB4r2O No.6212 Ignore Report Quick Reply

Well, to keep it brief, they can be fueled by isotopes that are ready available, nearly inexhaustible, safe to use, and easy to obtain. They do not create emissions such as coal/oil/natural gas plants, they can potentially create much, much more energy than our current fossil fuel power plants, are much safer than nuclear power plants (for example if something goes wrong with a tokamak, the building might explode, but you wont have to evacuate cities) and Tokamaks can be made so that the waste product they produce has zero radioactivity.

Unlike nuclear power plants today which use Fission, which creates tons of radioactive waste, and if a meltdown or another Chernobyl/Fukushima event happens. Tokamaks use Fusion instead. If a Tokamak was hit like Fukushima or Chernobyl was, there would of course be damages (venting superheated, compressed plasma will do that) but you would not have an ecological disaster.
Sophie Caddlecocke - Thu, 13 Mar 2014 07:04:04 EST ID:SlDB4r2O No.6213 Ignore Report Quick Reply
1394708644927.png -(1425387B / 1.36MB, 1502x751) Thumbnail displayed, click image for full size.

Totally forgot the image. Also forgot to say that some of the isotoped used to fuel a Tokamak can be harvested without damaging the environment. Here you can see one of them powering up.
Oliver Billingridge - Tue, 03 Jun 2014 11:32:10 EST ID:ON3r94Xq No.6339 Ignore Report Quick Reply
the maturing of wakefield-accelerators
these are the next generation of ultra-high energy particle accelerators. pretty neat and the principle behind it is very slick. one interesting aspect considering the possible uses is the size of these accelerators - with laser technology advancing and bringing forth table-top-terawatt lasers (and possibly soon even table-top-petawatt lasers) a full scale multi-GeV electron accelerator could fit inside a small laboratory instead of an underground complex spanning more space than a whole village.
Phoebe Hundleshit - Sun, 06 Jul 2014 12:03:13 EST ID:zSk0lVcV No.6393 Ignore Report Quick Reply
But how many fewer deaths? I'm not that old, yet I've already had 5 friends die in car accidents. Also, this is a pretty interesting topic. I had a principal in high school who was friends with one of the developers of those flat-panel TVs thin enough to hang on your wall. They had supposedly started working on that in the 60s with the goal of creating a TV thin and light enough to hang on your wall like a portrait. I can't even begin to imagine the amount of tech that various governments have under wraps.

engineering past 20? by Angus Hennerfit - Wed, 07 May 2014 16:45:31 EST ID:RFYmpDbI No.6293 Ignore Report Reply Quick Reply
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How old is too old /tesla/ ?

At what point am I too old to become an engineer?
5 posts and 2 images omitted. Click Reply to view.
Sidney Shittingdock - Sun, 18 May 2014 20:40:14 EST ID:cB3JxN8o No.6319 Ignore Report Quick Reply
I went to school with someone in their 40's in Mechanical Engineering. They learned incredibility fast and understood how physics functions in my Dynamics course. I say they were better student than majority of people in the major including younger ones

I've seen many older people in College succeeded over younger students. I think you just need to put effort into what are you learning.

just believe it and blaze it faggot
Simon Wommerwan - Mon, 02 Jun 2014 10:51:53 EST ID:QGLqmiTA No.6335 Ignore Report Quick Reply
Young people have higher brain plasticity BUT

Older people are more used to work and responsibility, and usually take studying a lot more seriously.

So eh.
Hugh Fenninglock - Tue, 03 Jun 2014 05:17:43 EST ID:WCjzl674 No.6337 Ignore Report Quick Reply
you can join the army and join the corps of engineers untill around age 30
Samuel Lightwill - Fri, 13 Jun 2014 16:11:13 EST ID:cEF2IEg5 No.6361 Ignore Report Quick Reply
don't compare yourself to other people because what matters the most to yourself should be you. do you like it? do you really like it? do it. i think you rather should ask yourself if you are competent enough to be an engineer.
as a freshman in ME, all of the older students seem to have gotten past the whole highschool-mentality point in their lives. being the youngest in the class has made me value older people for their experience.

be swift, try to remember the code/formulas as best you can by practicing,
& yenno, don't blaze it everyday (weekday) because staring into the fucking abyss while looking at equations you can't understand isn't fun
Phoebe Hundleshit - Sun, 06 Jul 2014 11:57:42 EST ID:zSk0lVcV No.6390 Ignore Report Quick Reply
I have a friend that's in his 30s who decided to go PE after he decided he hated his original profession. He always gets top grades. Sometimes they'll hire older candidates just because they're typically more responsible. You're only too old if you have alzheimers imo.

Good videos by Charles Chebblebury - Sun, 22 Jun 2014 19:10:43 EST ID:1GHqB3hY No.6375 Ignore Report Reply Quick Reply
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I just found this youtube channel that's a bunch of short expositions on engineering. They're pretty good. https://www.youtube.com/user/engineerguyvideo/videos?shelf_id=1&sort=dd&view=0
Hamilton Peblingman - Mon, 23 Jun 2014 13:54:59 EST ID:5gD9lQi4 No.6376 Ignore Report Quick Reply
I just got back from taking a tour of U of I. Godamn, it's flat out there...
Great campus though.
Ernest Soddlechun - Sun, 29 Jun 2014 20:31:55 EST ID:CKZoWqYh No.6384 Ignore Report Quick Reply
EEVBlog is great for electronics videos and some misc crap too

Increase voltage with a coil by Nathaniel Gonningwuck - Tue, 24 Jun 2014 08:17:41 EST ID:KZwWB+IQ No.6378 Ignore Report Reply Quick Reply
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I got small pump wanting 24V DC and a 19V power supply
How to make a simple coil to increase the voltage a bit ?
I know a step-up voltage regulator would be better
Hugh Sonningson - Tue, 24 Jun 2014 23:37:30 EST ID:01krkNKo No.6379 Ignore Report Quick Reply
How much current does the pump draw?
How much current can your power supply output?
Charles Chunderwill - Wed, 25 Jun 2014 00:16:32 EST ID:CKZoWqYh No.6380 Ignore Report Quick Reply
I'd just try to plug the power supply to the pump. Maybe it works on lower power too. Otherwise: http://en.wikipedia.org/wiki/Boost_converter
Thomas Sasslestock - Wed, 25 Jun 2014 06:58:04 EST ID:JxNe1/8s No.6381 Ignore Report Quick Reply
1403693884123.png -(16803B / 16.41KB, 250x162) Thumbnail displayed, click image for full size.
The power supply is 19Vx3A laptop charger
The pumps ampere is unknown i doubt its more then a few 100mA = 3-5watt total
Yes it works at 19V but i want full power
John Dunderludge - Sun, 29 Jun 2014 03:59:50 EST ID:XObDUDiZ No.6382 Ignore Report Quick Reply
even if you do get yourself full power, don't you also have to consider current loss?
How far is the pump from your laptop charger? From what I understand, the voltage will leak and diminish if you run your pump using cables over a long distance. My suggestion is to increase the voltage to something higher than what you need to make up for the voltage drop you might get.
David Gabberchodge - Mon, 30 Jun 2014 19:52:33 EST ID:WqKxlb7L No.6385 Ignore Report Quick Reply
There isnt much watt involved that's why this "dumb" solution would work out fine.
I know i got a ferrite ring somewhere,until i find it the project is on ice.

Identify component by Henry Brummlebanks - Sun, 22 Jun 2014 06:39:40 EST ID:2yGc5OTu No.6372 Ignore Report Reply Quick Reply
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Hello tesla
Im wondering what those blue pucks are on this old circuit board
Isabella Blythehall - Sun, 22 Jun 2014 16:51:13 EST ID:01krkNKo No.6373 Ignore Report Quick Reply
those are 100 uH inductors
Henry Brummlebanks - Sun, 22 Jun 2014 17:45:06 EST ID:2yGc5OTu No.6374 Ignore Report Quick Reply

solanoid valves by Basil Bunville - Fri, 06 Jun 2014 02:49:15 EST ID:XObDUDiZ No.6345 Ignore Report Reply Quick Reply
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I have a solenoid valve that I would like to control from my computer. I don't really want an expensive control box and my budget is $20 for something that is really simple. Literally all I want to do is plug in a usb that i can connect directly to my valve and turn it off and on from my computer but I don't want some large bulky or expensive thing or any kind of elaborate setup. What should I look for because I don't really have a clue what all the funky names are for the thing im looking for is called.
2 posts omitted. Click Reply to view.
Hugh Gucklewitch - Sat, 07 Jun 2014 08:12:29 EST ID:XObDUDiZ No.6348 Ignore Report Quick Reply
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They look so cool. Is there guides that I can get so I can figure out how to use it? I got specific ideas in mind. I just figured out I can control one from the internet. I want to do this instead. How cool would it be if I made a website you could all go to and control solenoid valves at my house? I really want to go through with this.
Phineas Sizzlebog - Sun, 08 Jun 2014 11:07:44 EST ID:sgRmu6cC No.6350 Ignore Report Quick Reply
There's a fuckin shitload of guides on how to use the arduino, for every single level of experience.
Phineas Cloppershaw - Sun, 08 Jun 2014 14:09:07 EST ID:As+rlL8l No.6351 Ignore Report Quick Reply

You need to know how to program in C to write programs for the arduino.

But for something as simple as what you need to do you could probably figure it out in a weekend if you've never programmed before.
Hugh Fublingbick - Sun, 08 Jun 2014 22:53:24 EST ID:XObDUDiZ No.6354 Ignore Report Quick Reply
On a sidenote, does python share similarities to C++?
I already have it on my computer and I was looking into tutorials for it. Otherwise I'd just get C
Caroline Brottinglock - Sat, 14 Jun 2014 12:32:07 EST ID:IvewFQxU No.6362 Ignore Report Quick Reply
You need something called a USB relay
They cost a few $
And then you probably need a powersupply that fits your solenoid

underwater rov by Shit Povingwill - Mon, 19 May 2014 18:07:05 EST ID:8ACDD/S2 No.6320 Ignore Report Reply Quick Reply
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how to insert cables into hermetic underwater structure?
what materials would you recommend for the skeleton? its supposed to be able to go 150m deep, sea water.
how do you attach parts (engines, lights, etc) to such skeleton?

i have no idea where to look for answers to questions like that. they're probably pretty retarded.
2 posts and 2 images omitted. Click Reply to view.
Hedda Chummerhood - Tue, 20 May 2014 17:56:35 EST ID:8ACDD/S2 No.6323 Ignore Report Quick Reply
told you i'm no good at it
actually i got bored once
Reuben Hellercocke - Sun, 25 May 2014 12:32:38 EST ID:WCjzl674 No.6327 Ignore Report Quick Reply
how about you use gaskets, OP
Nell Suffingfoot - Wed, 28 May 2014 15:07:54 EST ID:P1FecDgQ No.6330 Ignore Report Quick Reply

Gaskets could fail at those pressures if OP isn't careful. I'd recommend finding someway to waterproof and seal the electronics themselves, and allow water to enter the structure.
Captain Blackheart - Tue, 03 Jun 2014 05:25:49 EST ID:WCjzl674 No.6338 Ignore Report Quick Reply
for lights and cameras use gaskets & wrap in layers of clear plastic
and as for engine axles or hydraulics, look up submarine spec gaskets
good luck with your deep sea roving, Shit Povingwill !
underwater rov solution water pressure - Thu, 05 Jun 2014 06:09:13 EST ID:EDnokgZa No.6344 Ignore Report Quick Reply
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OP i remember reading somewhere that electronics can run uninterupted in mineral oil so my theory is anything that must keep dry i suggest creating a normal underwater and oil-tight enclosure and placing the electronics in the box fill till overflowing with mineral oil and seal with rubber o rings and gasket protected nuts n bolts and test at depth i remember this from overhearing a few marine rov pecialsts on natgeoHD and apoparently use it to stop camera and light bulbs from imploding underwater they pump any airpocket full of the stuff not only that but the oil acts to not only insulate from water and possible shorts but can severely lower the water pressure exerted upon your electronics enclosure

btw pic unrelated but stfu ozfag here

Books by Barnaby Dibblebanks - Sat, 17 May 2014 01:58:41 EST ID:RFYmpDbI No.6315 Ignore Report Reply Quick Reply
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Any good books on mechanical or electrical engineering, or engineering in general?
M - Sun, 18 May 2014 11:16:02 EST ID:06ISvFUq No.6317 Ignore Report Quick Reply
What are you looking for? something like a handbook?
Edwin Sidgeshaw - Wed, 21 May 2014 07:40:39 EST ID:RFYmpDbI No.6324 Ignore Report Quick Reply
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>something like a handbook?
A book of any kind, really. Where do I start?
Walter Niggergold - Wed, 21 May 2014 23:02:45 EST ID:CKZoWqYh No.6325 Ignore Report Quick Reply
Depends on your level and what you want to learn.
If you are a complete noob then start with just a basic inroductory physics books, like ''University Physics by Young and Freedman" and read the relevant chapters.
Then on the other hand if you want to know about signals and a lot of other EE stuff and you already know complex number theory, linear algebra and the other math involved, you could read something like "Signals and Systems by Oppenheim and Wilsky".
All really depends on what you know, what you want to learn, how intricately do you want to learn it(general description or mathematically going into it) et.c..
Reuben Hellercocke - Sun, 25 May 2014 12:30:46 EST ID:WCjzl674 No.6326 Ignore Report Quick Reply
if wanted to start engineering TODAY without prior knowledge of my field, maybe something beyond physics and basic maths
Hedda Wazzlewene - Thu, 05 Jun 2014 05:15:56 EST ID:ar3QJwTD No.6343 Ignore Report Quick Reply
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>if wanted to start engineering TODAY without prior knowledge of my field, maybe something beyond physics and basic maths.
What do I look at; Engineering monthly?
Do I want a dummies book?

Video Recording for Senior Design by Whitey Hemmledale - Wed, 04 Jun 2014 14:15:42 EST ID:8+Ra4Lcx No.6341 Ignore Report Reply Quick Reply
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Hey Tesla,

My group is currently designing an engineering capstone project, a video camera that automatically detects and records meteors or other aerial phenomenon. So far, we have acquired a camera outputting BNC cabling, designed our framing, and are starting to design an environmental container to keep the camera safe.

The problem we are having regards actually getting the camera to show up on the computer, that is, we have the BNC cable going to a BNC to USB converter, plugged into our USB (3.0) port on our computer. However, we are unable to get the camera to display with our capture software (UFOCapture).

We surmise that we may be missing a physical DVR box between the camera and computer to record the footage. Thus, I have come to you for help.

What is, in your opinion, the best way to get a BNC wired camera to display a live feed onto a computer. We also prefer to use a non wireless solution, as well, due mostly to out Mechanical concentrations in studies. Any help would be greatly appreciated, as video is generally our weakpoint in this project.

Thanks fellow Enginerds

pic related, an example of a best case scenario capture of a meteor.
Betsy Bligglechere - Thu, 05 Jun 2014 02:07:20 EST ID:2POYse6P No.6342 Ignore Report Quick Reply
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>unable to get the camera to display
why not?

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