Leave these fields empty (spam trap):
Name
You can leave this blank to post anonymously, or you can create a Tripcode by using the format Name#Password
Subject
Comment
[i]Italic Text[/i]
[b]Bold Text[/b]
[spoiler]Spoiler Text[/spoiler]
>Highlight/Quote Text
[pre]Preformatted & Monospace Text[/pre]
[super]Superset Text[/super]
[sub]Subset Text[/sub]
1. Numbered lists become ordered lists
* Bulleted lists become unordered lists
File

Sandwich


420chan is Getting Overhauled - Changelog/Bug Report/Request Thread (Updated April 10)

/a/ - Anime & Manga Discussion Now Available
LED strip Ignore Report View Thread Reply
Molly Secklemork - Fri, 31 Oct 2014 07:52:20 EST ID:IutPcDIx No.6556
File: 1414756340194.jpg -(52863B / 51.62KB, 640x360) Thumbnail displayed, click image for full size. 52863
I got hold of a led strip
The question is do you need a constant current driver to power it ?
There is no talk about that anywhere so im guessing the resistors on the strip is enough ?
Pic related im planning to glue it on the backside of my monitor
2 posts omitted. Click View Thread to read.
>>
Hannah Grimfield - Wed, 05 Nov 2014 00:28:22 EST ID:CU2h2CkN No.6563 Ignore Report Reply
>>6562
Also, be careful the power draw, a 1-2A may not cut it. If you're going crazy with LEDs, you could get a 24V 4A universal laptop power supply for < $20, which is pretty damn adjustable (12-24) and cheap. Now you can get a lot of good efficiency 12-24V power supplies, but they used to be outrageously expensive.
>>
Albert Hittinglan - Thu, 06 Nov 2014 10:47:48 EST ID:/iq4sJW2 No.6564 Ignore Report Reply
1415288868830.jpg -(94410B / 92.20KB, 1133x563) Thumbnail displayed, click image for full size.
Installation done
Im going to use the computers power supply to feed it
>>
Albert Hittinglan - Thu, 06 Nov 2014 11:32:19 EST ID:/iq4sJW2 No.6565 Ignore Report Reply
1415291539830.jpg -(66536B / 64.98KB, 791x585) Thumbnail displayed, click image for full size.
Test run with a tired 9 volt battery

pretty cool practical mod you can make for a 1$


Large Solar Panel Set Up Ignore Report View Thread Reply
Beatrice Trotbanks - Tue, 05 Aug 2014 01:07:08 EST ID:ZY7Dvhk/ No.6427
File: 1407215228906.jpg -(92593B / 90.42KB, 550x378) Thumbnail displayed, click image for full size. 92593
Ok , I need some serious help. I have a very large flat roof and I have the legal right to use Solar Panels. I would like to set up enough panels to run my business and my homes electical needs. I have about 15 thousand dollars to go into this. I would like be pretty much completely off the grid. I use about 3-4kw constantly and it adds up very fast through the electic company.I just got a 500$ bill . Could someone please explain to me how to do this properly. I basically need to be able to run 4kw -6kw constantly through the day min and i have 15000sq of space to put panels on money isnt really a problem for this but i dont want to be ripped off by a company so I rather do it by myself . Mainly to run lights, computers and Air conditioning and Heating devices. I want to be self sufficient and I want my dream of running a server hosting company to thrive but power seems to be the biggest problem right now. Pic related seems like a very easy way of setting up solar panels on the type of roof i have.
8 posts and 1 images omitted. Click View Thread to read.
>>
Nathaniel Tootville - Mon, 13 Oct 2014 23:40:25 EST ID:C5dsHNVe No.6518 Ignore Report Reply
1413258025264.jpg -(89474B / 87.38KB, 912x684) Thumbnail displayed, click image for full size.
>>6493
And thats why i added so much extra not to run them flat

There _was_ something called iron sulphate batteries they never wear out(!)
I dont think you can find them anymore except for ridiculous prices
They are ideal for heavy cycling power banks
>>
Emma Fodgedidging - Thu, 23 Oct 2014 03:45:58 EST ID:9Jhexzgj No.6537 Ignore Report Reply
Seriously, check out Aquion. There batterys cost only a litte more then lead/acid "car batterys", but have at least double the livetime + deep cycle capacity, non toxic and landfill safe but recycleable, and you get more energy back out of them (higher efficency). Also when standing at partial charge they dont crap out like lead/acid do, lower self discharge while maintaining low internal resistance (charge discharge at 5C!). Bonus is they require no balancing like lipo. And no im not affiliated, im a german electrician who has installed solar panels and stuff, i have seen commercial lead/acid energy storage and you would not believe the hassle you have (hydrogen build up, acid) with those, special ventilated and monitored rooms and stuff. I heard about aquion when they started out, and im pleased to see they have built a production line for a completely new product based on scientific progress in a few years. Even if aquion could hold only half of what they claim, these still would be real game changers for stationary energy storage. Not to forget this technology was invented and is produced in the US of A!
>>
James Cendleway - Tue, 04 Nov 2014 00:39:19 EST ID:5agsxU18 No.6559 Ignore Report Reply
>>6427
A forklift battery might be something to check out.


Basic Craftsmanship shit Ignore Report View Thread Reply
Edward Shakeway - Thu, 30 Oct 2014 12:49:51 EST ID:lwufqWOo No.6552
File: 1414687791675.jpg -(5240B / 5.12KB, 259x194) Thumbnail displayed, click image for full size. 5240
I am attempting to design and build a garbage bin grow chamber. What I have worked out, and this is very preliminary, is that I will use one LED light, a cone of aluminum foil from the light that directly focuses light on the growbed at the bottom. I'm drilling one hole, in which I will put a small fan. That is concern number one: how strong of a fan would I need to force the stanky ass kush air from the garbage can to my window, approximately a meter and a half away? Should I maybe install a larger fan on the top?

Concern number two is the hydroponic grow bed. Now I'm rreeaally new to this, truly out of my element, but I think a small waterbed with a pump that just swirls the water around, alongside careful nutrient and ph monitoring should be enough, right? I'd of course have the roots and clay medium in a cup with ample drainage so it can absorb nutrients.

Will post designs later today, when they are complete.

AS FOR WHY THIS ISN'T IN /CROPS/, because it has more to do with general knowledge of craftsmanship than a question directly related to growing.

Pic related, but I believe I can do better than that, with your help.

The end goal is to design the perfect garbage can grow op so that I can distribute it on the internet as an infographic.
>>
Edward Shakeway - Thu, 30 Oct 2014 12:55:59 EST ID:lwufqWOo No.6553 Ignore Report Reply
My room is about 21 degres, but since the airflow from the growbox is goig directly outside to the -20 Canadian weather, I think I'll need to some some heating in there just from leakage. Space heaters are bullshit, but maybe I could fit a small one into the garbage can?

The garbage can is also one of those giant, 360 liter motherfuckers.

So please, critique away!
>>
Edward Shakeway - Thu, 30 Oct 2014 13:00:26 EST ID:lwufqWOo No.6554 Ignore Report Reply
Does anyone know enough about carbon filters to help me perhaps substitute my stupid tube-to-window idea? If I could have a filter that eliminates odour I'd be more than happy.

nb sorry for spam


A hole in the wall Ignore Report View Thread Reply
HALP !8NBuQ4l6uQ - Tue, 21 Oct 2014 06:57:44 EST ID:c9D+RWua No.6533
File: 1413889064352.jpg -(2389691B / 2.28MB, 3072x2304) Thumbnail displayed, click image for full size. 2389691
Ok guys help me out?
How should I close this?
>>
HALP !8NBuQ4l6uQ - Tue, 21 Oct 2014 06:59:45 EST ID:c9D+RWua No.6534 Ignore Report Reply
1413889185307.jpg -(2856484B / 2.72MB, 3072x2304) Thumbnail displayed, click image for full size.
This is the ceiling of my room almost directly under the hole
it cant be a coincedence?
should i close the hole
and how?
pls hels
>>
Edward Broblingsan - Tue, 21 Oct 2014 15:19:36 EST ID:WgVvwjw+ No.6535 Ignore Report Reply
That rotten shit in the top of the picture is probably letting water in too

You need to wack away everything that is lose and put some new paint and plaster on.
>>
Emma Fodgedidging - Thu, 23 Oct 2014 03:20:16 EST ID:9Jhexzgj No.6536 Ignore Report Reply
Get a small (~1kg) bag of "Regulated set cement" aka "fast set cement". Unlike gypsum or plaster when hard its waterproof. Then get some old Newspaper, crumple it and stuff it in the hole, just enough so it will stop the runny cement from going where gravity wants it. Moisten the edge of the hole for the cement to stick better. Now mix the cement in a small container with a bit of water to get a puddy. Yes it will feel like a lot of cement to a small amount of water. Then quickly dump it in there, have a spatula handy to keep it at bay while runny, it should quickly (5min) start to harden. Instead of a spatula a flat piece of hard plastic could be used, so the only thing you need to buy is cement.


Former military maint. here Ignore Report View Thread Reply
Lillian Demmlenud - Wed, 10 Sep 2014 14:00:59 EST ID:mJgHVzRU No.6478
File: 1410372059808.jpg -(63265B / 61.78KB, 353x403) Thumbnail displayed, click image for full size. 63265
I did electronics in the military. Mainly RF related stuff but we had to learn the fundamentals of electronics and shit for component level maintenance on radios and stuff. I still have all the study materials actually.

>basically I'm not incompetent with electronics.
>I fucking hate the power company. Seriously. I run a window unit maybe twice a week and my bill is over $100/month.
>I have a few hundred bucks to spend on this.


Can I:
>Buy 1Kv worth of solar cells off eBay. $350-400. Prices have fallen a lot. Maybe $100 in supplies to frame/protect the fragile cells properly.
>A big ass UPS. Maybe a 750W since they're cheaper. A 2000W is $1,000USD. There are some smaller ones for $150. All in all it's cheaper to do a UPS as opposed to inverter + batteries.
>Also I can get more batteries and add in series to the UPS. I've done it before on a smaller one.

I've already rigged up an idea to move the panels if need be at different times of the day on my roof. Pivot it on the apex of my roof. also I have fucked with Arduino and servos and I know I could easily rig/program something up with a timer or photosensor.

Is this reasonable to power a Window A/C unit or something? I know I can't power my house or anything, but What could I reasonably expect to do with such a setup and is it reasonable?
Comment too long. Click here to view the full text.
5 posts and 1 images omitted. Click View Thread to read.
>>
Hugh Gabberkane - Sat, 27 Sep 2014 18:43:22 EST ID:mVz7+fwB No.6501 Ignore Report Reply
>>6485
The UPS is made for 1 battery 12v ?
you runt x5 = ~60volt

I doubt it will survive for long with that arrangement

If you connect the batteries in parallel you get juice from all the batteries AND the 12 volt in the UPS was built for.
>>
Augustus Hindlelutch - Tue, 07 Oct 2014 09:35:53 EST ID:gC5PoI5b No.6510 Ignore Report Reply
>>6478
just a quick thought.

you could use water potential to save your energy. especially since you could easily scale your capacity. also no stupid amounts of clusterfuck battery work. just water.

of course you would loose a lot of energy due to friction and efficiency of your pump/generastor set up.

but it would reduce the probability to kill yourself. which seems pretty high to me after reading this thread.
>>
Nigel Drashcocke - Mon, 13 Oct 2014 12:58:46 EST ID:CU2h2CkN No.6516 Ignore Report Reply
To charge batteries you should look into a pulsed constant-current power supply. The pulse frequency can be set to a voltage level, so that way with low incoming volts you charge slowly, but at higher ones you charge faster. To control all of this requires a fair amount of calculations and integrated circuits to be efficient, but it's infinitely better than trying to do it a simpler way.


wat do Ignore Report View Thread Reply
Edward Ginnerlet - Mon, 22 Sep 2014 06:26:14 EST ID:loYdgfM0 No.6497
File: 1411381574582.jpg -(127554B / 124.56KB, 718x720) Thumbnail displayed, click image for full size. 127554
Next year I specialize my engineering major, I'm thinking chemeng but also environmental engineering as the whole environmental industry is growing and will continue to grow.
what do u guys reckon?
>>
Phoebe Hozzledock - Mon, 06 Oct 2014 21:04:09 EST ID:LH0JElb5 No.6508 Ignore Report Reply
I'd say something viable in the market. Chemeng I've heard is flooded with people and it's one of those deals where you have to keep getting degrees to beat out the competition.

I'd go with environmental engineering, a buddy of mine graduated with that and is doing well for himself, has worked for the city and is now at a power plant station doing idunnowhat, but he's doing well for himself either way.
>>
John Clannerferk - Mon, 13 Oct 2014 01:57:46 EST ID:oGFKhUDK No.6513 Ignore Report Reply
Western world is declining
No one will give a shit about your compost engineering degree when they roast a rat over a burning car tire.

If you want to play it safe take field that will always be needed.
>>
Nigel Drashcocke - Mon, 13 Oct 2014 12:53:55 EST ID:CU2h2CkN No.6514 Ignore Report Reply
I'm currently going for Industrial Engineering, but it's literally more of a management position. I may go for a Bachelors in Manufacturing Engineering instead, go for maybe a Electronic's Master, then go for a DoE in Physics.

The Industrial Engineering program I'm going for also has a variant so in +3 years I could go for IE+Management Bachelors, instead of just the +2 for IE.

I love working with machines but I'll probably do electronics and programming on the side.


International Internship Ignore Report View Thread Reply
M - Wed, 10 Sep 2014 10:45:50 EST ID:06ISvFUq No.6477
File: 1410360350705.jpg -(24597B / 24.02KB, 534x443) Thumbnail displayed, click image for full size. 24597
Hello dear /Tesla/

I am a longtime lurker and sometimes poster on this board. I am in my second year of my Bachelor in mechanical engineering. At the start of my third year I will do a 5/6month internship, I want to do this anywhere but The Netherlands, where I live.
This brings a problem with it though. I have absolutely zero professional international connections. Please help me find companies or organisations where I might be able to do my internship.
I really don`t care what direction it is in as long as it`s mechanical engineering. I only speak English and Dutch so that might something to take into account.
picture fairly unrelated
>>
Samuel Driblingstone - Sun, 14 Sep 2014 19:23:44 EST ID:zMqrLaGO No.6486 Ignore Report Reply
"Hi professor, I see you worked for this US/UK/German/Swedish firm. I'd like to do my internship abroad. Could you write me a letter of recommendation to your former place of work."
>>
M - Mon, 15 Sep 2014 01:55:06 EST ID:06ISvFUq No.6488 Ignore Report Reply
>>6486
Yes I tried that, didn`t turn up anything.

I might be on to something in India trough Leave Ur Mark though. I hope that turns out to be something nice
>>
Whitey Sazzlefire - Wed, 17 Sep 2014 09:28:58 EST ID:moeap6T7 No.6492 Ignore Report Reply
Ask family and friends. I worked one summer with a guy from Spain whose dad had asked our boss about work. I've gotten 4/5 summer jobs through family and friends.


homework help Ignore Report View Thread Reply
marcus - Wed, 09 Apr 2014 23:02:14 EST ID:Zi2fG07Z No.6242
File: 1397098934086.jpg -(1610760B / 1.54MB, 2592x1944) Thumbnail displayed, click image for full size. 1610760
Can anyone tell me how to find the radius of this circle is?

Sorry for the crappy artwork.
10 posts and 3 images omitted. Click View Thread to read.
>>
M - Fri, 29 Aug 2014 13:48:22 EST ID:06ISvFUq No.6465 Ignore Report Reply
>>6329
Autodesk Inventor 2014
If you don`t study something like mechanical engineering I`d not recomend buying it. Don`t know how hard it is to torrent it
>>
Eric Olsen - Sun, 07 Sep 2014 13:11:15 EST ID:dc6TfhZQ No.6474 Ignore Report Reply
>>6242
the lawe of sines states that:
sin A/a = sin B/b = sin C/c
so, sin(30)/30 = sin(90)/x
just use algebra now to solve for x
>>
Basil Farringnot - Tue, 16 Sep 2014 15:03:56 EST ID:LH0JElb5 No.6491 Ignore Report Reply
draw it in autocad or something


Heating duct engineer Ignore Report View Thread Reply
William Conderfoot - Thu, 25 Oct 2012 10:43:16 EST ID:LmAefPGY No.5034
File: 1351176196262.jpg -(508304B / 496.39KB, 1372x925) Thumbnail displayed, click image for full size. 508304
I came into this game for the action, the excitement. Go anywhere, travel light, get in, get out, wherever there's trouble, a man alone. Now they got the whole country sectioned off, you can't make a move without a form. Listen, this old system of yours could be on fire and I couldn't even turn on the kitchen tap without filling out a 27b/6... Bloody paperwork.
>>
Isabella Snodwater - Mon, 15 Sep 2014 01:58:32 EST ID:0l9kqM5+ No.6489 Ignore Report Reply
>>5034

brazil


Electric Gun Ignore Report View Thread Reply
Charles Millerwetch - Tue, 03 Jun 2014 16:08:16 EST ID:5gD9lQi4 No.6340
File: 1401826096844.jpg -(239646B / 234.03KB, 1366x768) Thumbnail displayed, click image for full size. 239646
Any information about the piezoelectric ignition threshold for firing a .22 rimfire round?
What kind of math would you have to do to find the electricity needed for this sort of thing?

Super compact rimfire potentially incoming.
4 posts omitted. Click View Thread to read.
>>
Barnaby Clashhall - Thu, 04 Sep 2014 17:19:17 EST ID:2s0Y1xJY No.6472 Ignore Report Reply
>>6340
Hey my thread is alive again!

I wanted to put a gun into a super small space, like an altoid tin or a zippo lighter.
Thought it would be cool to have a zippo gun. I know people do it, but with piezoelectric ignition, it could be SUPER compact.
>>
Simon Blatherwill - Sat, 06 Sep 2014 22:36:02 EST ID:VGutYBla No.6473 Ignore Report Reply
That would be cool. Have you got any plans drawn up to see if it would work?

I found this that looks pretty cool: http://www.everydaynodaysoff.com/2010/11/27/zippo-lighter-gun/
>>
Frederick Heblingchatch - Sun, 07 Sep 2014 22:53:39 EST ID:2s0Y1xJY No.6475 Ignore Report Reply
>>6473
Yep I'm pretty sure that's where I first got the idea.
I don't have any formal plans at the moment, I just made it a goal of building a system that could safely fire .22 rounds before getting fancy about it. After studying the extensiveness of mechanical/physics knowledge necessary to casually construct things like this, I don't think I will be able to put it together until I have some serious free time. Plus, I'm back in school now, so I gotta focus on finishing my Biology major before I can go and do all the other projects.
>Having ADD doesn't help either.


career advising Ignore Report View Thread Reply
Reuben Buzzshaw - Tue, 02 Sep 2014 17:42:41 EST ID:h4yAb3hN No.6468
File: 1409694161194.jpg -(7425B / 7.25KB, 305x165) Thumbnail displayed, click image for full size. 7425
Completed my first term community college. All I know is I'm pretty good at math and I enjoy it. People keep telling me to pursue engineering degree or something. Don't know what else I would want to do. Have a career advising appointment in a couple weeks. I want to know what my choices are if I do decide to become an engineer. Do you guys have any advice for me? I would seriously appreciate it.
>>
Gazpacho - Wed, 03 Sep 2014 23:44:52 EST ID:9Fgjepcp No.6469 Ignore Report Reply
1409802292002.jpg -(210255B / 205.33KB, 500x750) Thumbnail displayed, click image for full size.
Advice for following any career line; pick one you good go to work on a shitty day and tolerate if at worst, or at best makes your day better. From there see what you'd wanna practice. CE, CS, EE, ME or in my metallurgy.
>>
Gazpacho - Wed, 03 Sep 2014 23:46:44 EST ID:9Fgjepcp No.6470 Ignore Report Reply
>>6469
Fuck my grammar isn't with me tonight.


can this be done? Ignore Report View Thread Reply
Simon Duvingdore - Wed, 06 Aug 2014 00:34:57 EST ID:zCR9OQf3 No.6429
File: 1407299697013.jpg -(40204B / 39.26KB, 900x601) Thumbnail displayed, click image for full size. 40204
is it possible to engineer robotic engineers to make nanos that go into the stream and flow of a cancer patient?

i see doctors these days using technology kinda like a video game right?

if nano technology is real then why can't it be usesd to cure cancer? and then little lasers or something eat away at the cancerous cells bit by bit.. i mean.. if it can be done would this be a practical way to rid the body of cancerous cells?
>>
Rebecca Cimmerwater - Sun, 31 Aug 2014 06:03:54 EST ID:5JL102Ix No.6466 Ignore Report Reply
Nothing close to nanodocs, like in Dirty Pair: Sim Hell or the Eric Bana Hulk, Michael Crichton's "Prey" covered the problems with making itsy little clanking self-replicators pretty well.
Closest I've heard to that was an application of Buckyballs made of a co-polymer, like a tank of them used as a filter, that captures diseased blood cells for treating leukemia. Only they had to manufacture the buckyballs in space, in microgravity.


Thermite yo Ignore Report View Thread Reply
Shitting Bushstune - Thu, 21 Mar 2013 07:40:29 EST ID:nhiG8qtg No.5506
File: 1363866029859.png -(36564B / 35.71KB, 331x325) Thumbnail displayed, click image for full size. 36564
Would this work? If so how could it be optimized? I was thinking of adding some barium nitrate in there but I fear it may burn too quickly, was also wondering how effective it would be if the oxidizer was replaced with say, copper oxide?. I need suggestions from the fine folk of /tesla/.
18 posts and 2 images omitted. Click View Thread to read.
>>
Matilda Geblingdale - Sat, 16 Aug 2014 19:03:20 EST ID:zo57f3iv No.6444 Ignore Report Reply
>>5562
>thermite near any part of your body
retard had it coming
>>
Albert Greenfield - Wed, 27 Aug 2014 17:49:39 EST ID:5+sMfTlK No.6459 Ignore Report Reply
OP's dildo may contain sensitive information, and consequently he/she needs a way to destroy it quickly should it fall into enemy hands. Consider adding a radio detonator in addition to >>5517 's advice.
>>
Angus Dundlehall - Fri, 29 Aug 2014 09:31:41 EST ID:SwrqeSTp No.6464 Ignore Report Reply
This boards namesake would be proud, you guys.


Water System Ignore Report View Thread Reply
Henry Greenham - Thu, 28 Aug 2014 11:09:15 EST ID:zp5ivIRS No.6461
File: 1409238555876.png -(379587B / 370.69KB, 482x509) Thumbnail displayed, click image for full size. 379587
Hey /tesla/

2nd year Civil Engi student here. I'm balls deep in an assignment for a Water Systems unit taught by some Indian guy. His english isn't too great and there's often small spelling errors in his lecture material and sometimes equations.

In this assignment he asks the following question;
"Water is pumped from underground storage the ground reservoir to the network ABCD.
The flow in DC is 15 L/s and C = 100 for all pipes."

My question is what are DC and C?
I'm thinking DC is De-Compressible? I'm not sure and all google searches lead to electrical current, not that of water.

Also not sure what C is either. Any help appreciated.
>>
Henry Greenham - Thu, 28 Aug 2014 11:14:22 EST ID:zp5ivIRS No.6462 Ignore Report Reply
1409238862876.gif -(2860882B / 2.73MB, 240x135) Thumbnail displayed, click image for full size.
>>6461
Fuck I'm stupid. Just realised DC means the pipe connection between D and C. Sorry guys. Still not sure what C could be. NB. LIKE IT MATTERS ON TESLA FUCK ME RIGHT? KEK


<<Last Pages Next>>
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
Report Post
Reason
Note
Please be descriptive with report notes,
this helps staff resolve issues quicker.