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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.

Help me out bros by Cornelius Pockson - Mon, 24 Nov 2014 16:47:55 EST ID:PAbwN0uU No.6576 Ignore Report Reply Quick Reply
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Heya, dunno if im in the right board, but i thought you guys might know whats going on.
So I got a 120w Led panel with red led dominance, and i added a 40w CFL to boost up the grow. And the CFL's light and the bulb turned green when I turned it on. Seems weird since the light produced by the led is a bright pinkish color.
I was just wondering if leds overpower the spectrum somehow and the CFL is useless.. So do I just take the CFL outta there or leave it?
Molly Nickleville - Tue, 25 Nov 2014 09:48:17 EST ID:06ISvFUq No.6577 Ignore Report Quick Reply
I`m not an expert on that shit but I think the pink colour of the leds overpower the CFL, making it look green. I`m quite sure that when you switch the leds off the CFL will look white again. I don`t think a 40W CFL will add much to 120W led but its better than without it I guess.
Nicholas Chundercocke - Wed, 26 Nov 2014 16:20:46 EST ID:OYFPhNGh No.6578 Ignore Report Quick Reply
Answer's easy: optical illusion, human eye isn't really good at determining "true" color of light, think camera automatic white balance, our brain is just so good we normally don't realize. In practice we can tell when we see both light sources at the same time (assuming no mixing)

Career choice idea by Alice Gellysot - Fri, 14 Nov 2014 12:47:59 EST ID:ynSy5DbE No.6568 Ignore Report Reply Quick Reply
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So I'm working on getting my certification from a community college for HVAC/R. Then afterwards getting a certification in electrical engineering from the same CC. My plan is to use my contacts in the growing medical marijuana industry to get contrats for jobs setting up energy efficient/safely designed grow rooms.

My questions are is a 1 year certification in both going to be enough to have the credentials needed? Specifically if it becomes legal in my state, will I need more on paper education to be hired by the big commercial operations or will they want to see more on paper?

Do yall think I should just focus on getting my associates in HVAC or get two one year certifications?

I plan on starting my own HVAC business specializing in legal op setups.
Wesley Cliddlemene - Fri, 14 Nov 2014 13:28:09 EST ID:VBJecc+I No.6570 Ignore Report Quick Reply
Sounds like some bogus cert
Certified electrician is 3 years education + about 1 year apprentice in my part
the world.
Clara Wiggleforth - Wed, 19 Nov 2014 21:36:00 EST ID:7wKbt66O No.6575 Ignore Report Quick Reply
I'd go full HVAC for now you could do EET later if you want/need to. One year is probably not enough for HVAC. You probably already know this, but apprenticeship is really important so I hope you have someone in mind who will take you under t

Desulfator operations by Hannah Chuddlefit - Mon, 17 Nov 2014 22:02:24 EST ID:7AgRxdIR No.6572 Ignore Report Reply Quick Reply
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I got a battery restorer and it seems to be working but the manual dont say if
i should cycle the battery with the desulfator or keep it at constant charging with the desulfator connected.
Edward Drummleman - Tue, 18 Nov 2014 11:51:56 EST ID:06ISvFUq No.6573 Ignore Report Quick Reply
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Did you feel like sharing this with us or is it a question?
Nell Songershaw - Tue, 18 Nov 2014 12:31:54 EST ID:CTVNwfzg No.6574 Ignore Report Quick Reply
>if i should cycle the battery with the desulfator or keep it at constant charging

Electrical by Eliza Trotfield - Fri, 24 Oct 2014 01:59:12 EST ID:V3vXWr1R No.6539 Ignore Report Reply Quick Reply
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I want to switch from electrical engineering to computer sci in my 5th year

; still two semesters till I graduate, and falling grades.

No more "hang in there" and just finish; I still have 2 semesters left, and for me that's two semesters too long. Literally just working on a bunch of outdated software, and learning intangible circuit equations. I have been an intern already at a startup that makes aerial filming drones and I didn't like the electrical bit at all. I was more interested in just building them up than anything that had to do with electrician engineering.


DO PEOPLE ENJOy comp sci at school and work?
Polly Breffingstotch - Sat, 25 Oct 2014 17:50:41 EST ID:CU2h2CkN No.6544 Ignore Report Quick Reply
>computer scientists
No. Computer Science is like a Math degree, people get it for fun, but it is SHIT SHIT SHIT for work. Computer scientists usually end up getting certifications or find some training in some database or network language, and go work on managing some network for an organization.

There's probably something else like Computer Engineering or something you could get into which would still overlap at least somewhat with the electronics.

College work also tends to be esoteric compared to what you end up doing in the real world. They mostly use degrees so they can claim some sense of responsibility. An Electrical Engineer could go into wiring up buildings (related to civil but they focus far more on structure itself), designing systems for cars or other vehicles, managing things on the component level, and not the intrahardware or programming designs.

Something more microcomputer+electronics would ABSOLUTELY be more fruitful, as "the internet of things" meme will catch on, and you'll get to be right in the middle of the boom that will come from digitizing everything.
Hannah Nunnershit - Thu, 06 Nov 2014 13:53:02 EST ID:pW0l2lUu No.6566 Ignore Report Quick Reply
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Switch to something like "physical technology". You learn how to design, and put together all these ideas in your head with a focus on making a complete product.
  • you already know a good part physics so its gonna be "easy"
  • one of the most future proof and versatile well paid degrees you can get

LED strip by Molly Secklemork - Fri, 31 Oct 2014 07:52:20 EST ID:IutPcDIx No.6556 Ignore Report Reply Quick Reply
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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
Phyllis Gannerridge - Mon, 03 Nov 2014 23:41:43 EST ID:01krkNKo No.6558 Ignore Report Quick Reply
Impossible to say without knowing the specs or anything about it. Most LEDs can be driven with a PWM. That's better for dimming anyway,
Hannah Grimfield - Wed, 05 Nov 2014 00:23:01 EST ID:CU2h2CkN No.6562 Ignore Report Quick Reply
LED strips are pretty damn consistent 12V driven. Unfortunately the resistors drop the efficiency like crazy. There is likely per LED, and literally mine are 3 separate LEDs, so there isn't even a 3Vresistor+3Vserial LED(75% efficient), it is (9R+3LED)x3, 25% efficiency.

There might be a way around it, like maybe some brands have all-on or all-off that are more efficient. If you want better efficiency, you can look into LED squares+heatsinks. Those fuckers reach the same brightness/panel as 60-75W incandescent bulbs. Most LED bulbs are half that.
Hannah Grimfield - Wed, 05 Nov 2014 00:28:22 EST ID:CU2h2CkN No.6563 Ignore Report Quick Reply
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 Quick Reply
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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 Quick Reply
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Test run with a tired 9 volt battery

pretty cool practical mod you can make for a 1$

Large Solar Panel Set Up by Beatrice Trotbanks - Tue, 05 Aug 2014 01:07:08 EST ID:ZY7Dvhk/ No.6427 Ignore Report Reply Quick Reply
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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.
6 posts and 1 images omitted. Click Reply to view.
Sidney Pundlegold - Fri, 19 Sep 2014 04:31:47 EST ID:XpPyXVeY No.6494 Ignore Report Quick Reply
"Aquion Energy" use their batterys, they have all u ever wanted for stationary use.
Nigel Drashcocke - Mon, 13 Oct 2014 13:01:23 EST ID:CU2h2CkN No.6517 Ignore Report Quick Reply
You can look into investing in Vanadium batteries.
Nathaniel Tootville - Mon, 13 Oct 2014 23:40:25 EST ID:C5dsHNVe No.6518 Ignore Report Quick Reply
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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 Quick 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 Quick Reply
A forklift battery might be something to check out.

Basic Craftsmanship shit by Edward Shakeway - Thu, 30 Oct 2014 12:49:51 EST ID:lwufqWOo No.6552 Ignore Report Reply Quick Reply
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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 Quick 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 Quick 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 by HALP !8NBuQ4l6uQ - Tue, 21 Oct 2014 06:57:44 EST ID:c9D+RWua No.6533 Ignore Report Reply Quick Reply
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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 Quick Reply
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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 Quick 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 Quick 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 by Lillian Demmlenud - Wed, 10 Sep 2014 14:00:59 EST ID:mJgHVzRU No.6478 Ignore Report Reply Quick Reply
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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.
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Hugh Fushnod - Fri, 12 Sep 2014 08:05:12 EST ID:xrky+ufW No.6482 Ignore Report Quick Reply
You could shine mirrors on the cells for more power.
Samuel Femblemick - Sun, 14 Sep 2014 10:25:03 EST ID:mJgHVzRU No.6485 Ignore Report Quick Reply
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OP here

Right now I have 4 of these wired in series and connected to a shitty old single battery, dual plug UPS. Just testing the waters. It runs a full sized fan on medium setting for a few hours without dying. I don't want to leave it overnight because I don't know whether these batteries die permanently if drained 100% or if my ghetto contraption will burn my house down.

Also there is noticeable noise/hum coming from the unity so I think the quality of AC power isn't great. Probably needs a power conditioner. I won't dare plug a computer or anything needing a stable and consistent 60hz in yet.


Shit I didn't think of this. I was trying to avoid a power inverter by going the UPS route but this is probably right. I'm pretty sure if I got ahold of a decent schematic I could etch a pcb up but I don't have test equipment other than my Fluke Digital Multimeter if it was required.


Instead of all that fancy stuff I could go analog too. Put the panel on a hinge on the apex of my root. One rope to pull it to the east-facing side for sunrise, one to pull it to the west facing.
I literally have 3000ft of "550 cord" so the possibilities are endless for that. I'll check those batteries out. I just know I need the kind where if I run it 100% dead it won't kill the battery altogether.
Hugh Gabberkane - Sat, 27 Sep 2014 18:43:22 EST ID:mVz7+fwB No.6501 Ignore Report Quick Reply
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 Quick Reply
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 Quick 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 by Edward Ginnerlet - Mon, 22 Sep 2014 06:26:14 EST ID:loYdgfM0 No.6497 Ignore Report Reply Quick Reply
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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 Quick 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 Quick 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 Quick 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 by M - Wed, 10 Sep 2014 10:45:50 EST ID:06ISvFUq No.6477 Ignore Report Reply Quick Reply
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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 Quick 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 Quick Reply
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 Quick 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 by marcus - Wed, 09 Apr 2014 23:02:14 EST ID:Zi2fG07Z No.6242 Ignore Report Reply Quick Reply
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Can anyone tell me how to find the radius of this circle is?

Sorry for the crappy artwork.
8 posts and 3 images omitted. Click Reply to view.
marcus - Wed, 27 Aug 2014 23:25:48 EST ID:Zi2fG07Z No.6460 Ignore Report Quick Reply
60 would make a hexagon the width of the block. I need the full width of the circle.
Sophie Blosslestune - Fri, 29 Aug 2014 00:58:34 EST ID:01krkNKo No.6463 Ignore Report Quick Reply
Alright since you've been so patient, the radius is roughly 93.06280143852685029519

You have to use a little trig, do some algebraic substitution, and you have to complete a square somewhere. If you don't know where to start, try to picture a second right triangle formed by a line from the center of the circle to the top right corner of the box, and use a variable (y) to represent the height from the center of the circle to the bottom horizontal line.
M - Fri, 29 Aug 2014 13:48:22 EST ID:06ISvFUq No.6465 Ignore Report Quick Reply
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 Quick Reply
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 Quick Reply
draw it in autocad or something

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