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Sandwich


Discord Now Fully Linked With 420chan IRC

The smallest mechanisms you ever did see

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- Thu, 16 Jan 2014 18:50:27 EST 5gD9lQi4 No.6099
File: 1389916227194.jpg -(99414B / 97.08KB, 750x563) Thumbnail displayed, click image for full size. The smallest mechanisms you ever did see
Here's what I need: A way of building a bunch of super small mechanisms with limited resources I can buy at the local hardware store and no real machining tools other than a dremel.
I enjoyed making an alcohol stove with no power tools using Tetkoba's videos on Youtube. I want to do more stuff like that.
If anyone has ideas about what to build and how to build it (mainly plans for the mechanisms), that would be super duper!
>>
David Passlewune - Fri, 24 Jan 2014 13:29:50 EST uEfymhfr No.6105 Reply
>>6099
Watch the youtube videos from KipKay!
Tutorials and whatnot.
>>
Cyril Chummerchadging - Thu, 30 Jan 2014 02:13:50 EST TRG9wKw/ No.6108 Reply
build a furnace out of a can, plaster of paris, sand, and a torch, then smelt cans and put them into molds
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Phineas Hashshaw - Wed, 26 Feb 2014 21:10:03 EST Jk2UBRNv No.6163 Reply
Or build a fucking SOLARFORGE with a fresnel lens...

we academia now

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- Wed, 19 Feb 2014 01:51:22 EST BKcz5mkY No.6147
File: 1392792682935.gif -(510061B / 498.11KB, 500x362) Thumbnail displayed, click image for full size. we academia now
literally probably the slowest board on the site


still love you guys


we should start some open source projects, I'm down if you're down

I've been thinking of designing a mesh network guerilla internet that is independent of ISPs and their bullshit

how do we organize this?

i'm serious about this too
2 posts and 1 images omitted. Click View Thread to read.
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Anonymous - Fri, 21 Feb 2014 01:25:51 EST kU/b2Op8 No.6153 Reply
for a mesh network you need a lot of users or large coverage. HAM packet radio has large coverage, but only slow connection. some fancy shooting up satellites, also large coverage and slow, taking years for research of course.
for home router usage there is b.a.t.m.a.n., a protocol for wireless meshing in actual use.
p2p and freenode have (had?) the same aspiration as OP, don't think they took of.
i find academic projects for the solely educational purposes that are not actually usable hardly motivating and ideas already cheaply implemented a waste of time.

any other ideas?
>>
Phoebe Dendlelure - Sun, 23 Feb 2014 23:08:39 EST /Alv3nG/ No.6160 Reply
>>6147
I'm thinking of starting an open-source/hardware audio-mixer, DJ controller type device that could be used to control DJ or music production software.

Variable Expansion

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- Sat, 15 Feb 2014 19:42:29 EST YZp2n0B6 No.6141
File: 1392511349325.jpg -(186753B / 182.38KB, 1571x2356) Thumbnail displayed, click image for full size. Variable Expansion
Hey guys and gals. I'm looking for something mechanical that expands and contracts lengthwise. Something like a baton or lightsaber. Only it has to be really tiny, like a pencil. But also have a fine resolution on how long/short it is. Does such a device exist??

Please let me know if you need some clarity.
2 posts omitted. Click View Thread to read.
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Fucking Sollyville - Mon, 17 Feb 2014 12:33:44 EST CKZoWqYh No.6144 Reply
A quartz crystal
>>
Simon Noffingsock - Thu, 20 Feb 2014 02:49:46 EST SB9ZYn17 No.6149 Reply
>>6141
Sigh, are you trying to make a gravity wheel?
>>
Jack Nicklefield - Sat, 22 Feb 2014 23:33:13 EST ICNMu9y9 No.6156 Reply
so like you have your compass right
you hold down the contractor and levitate the mouse slightly above the mousepad
and all of the sudden you can remember where the buttons are without clocking out left to right like the variable expansion of a drag
Like what do you mean lengthwise it's a pencil if you wanna drag charcoal around all the time it's gonna squeal like deaf

electrician time

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- Tue, 18 Jun 2013 20:39:42 EST Trq6+u+h No.5760
File: 1371602382238.gif -(333911B / 326.08KB, 163x200) Thumbnail displayed, click image for full size. electrician time
hey guys, i want to be an electrician

are there any recomended trade schools that i could attend that cheap/good educating/ect? i live in the nyc area thanks guys
4 posts omitted. Click View Thread to read.
>>
Eliza Shakefuck - Tue, 02 Jul 2013 20:55:38 EST BCwPed96 No.5783 Reply
>>5760
Look into University of Delaware for Electrical Engineering. I'm currently going there for Mechanical Engineering and it is a great school.
>>
Lego - Mon, 17 Feb 2014 17:21:43 EST 6gKb6+Eq No.6145 Reply
Move to moxxy/yakima washington. There's a tech school there called Perry technical institute. I believe it's about $30 grand for a 2 year program from electrician. They have a 100% employment rate too. There's a few hours of classroom time every day, followed by like 5 with hands on training. It's pretty much a full time job. The cost of living in Yakima/Moxxee is easily manageable though. I have a cousin who just got done with his program and had several job offers into good companies. The school even helps you build your resume, and they make it a point of setting you up with an awesome job, as it reflects back on their service. It would be a big life change, but I can definitely tell you that if you have time and money, it is by far one of the best places to educate you properly and set you up with an awesome career with room to move up.
>>
Nigger Blackleville - Tue, 18 Feb 2014 05:10:22 EST BKcz5mkY No.6146 Reply
>>5783
he wants to be an electrician not an engineer foo

MET vs ME

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- Tue, 26 Nov 2013 01:15:59 EST lu2Ug2u8 No.6013
File: 1385446559152.jpg -(24789B / 24.21KB, 475x321) Thumbnail displayed, click image for full size. MET vs ME
Whats the difference between a BSMET and a BSME? My local tech uni claims that their MET grads are 'engineers' but from what Ive read MET's are considered 'technologists'

(This school's ME program hasn't produced any grads yet and is therefor unaccredited)
4 posts and 1 images omitted. Click View Thread to read.
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Samuel Buckleheg - Sat, 15 Feb 2014 00:39:23 EST BKcz5mkY No.6139 Reply
>>6138
wouldn't the negative voltage on top and positive on the bottom fry it? is that why you're saying it's railed at 52?
>>
Edward Mangernad - Sat, 15 Feb 2014 13:37:02 EST UD9Q5Q+J No.6140 Reply
>>6139
He didn't specify which power pin the negative voltage is connected to. Even though the negative voltage is on top, we have to assume that it's connected to the negative supply pin, and positive to positive. For some reason he has the output of the 1st op amp tied to the negative supply on the left, so that op amp will get fried, but let's just say in a perfect world the power supplies have zero source impedance and can source an infinite amount of current. The input to the second op amp would be -15V, and it has a gain of -2, so the output is railed at 15V (minus a diode drop here or there, I forget).

Audio Electronics

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- Thu, 09 May 2013 10:25:57 EST 5EiDjcTO No.5631
File: 1368109557306.jpg -(697015B / 680.68KB, 1600x900) Thumbnail displayed, click image for full size. Audio Electronics
I would be very grateful if anyone with any knowledge of audio engineering could give me a hand here. Even basic electronic descriptions would be great.
Could someone please explain to me the purpose of Capacitors, Resistors, and other components within a mixing console?
I understand there's a total "we wont do your homework for you" and that's fine, but I'm struggling to find a description of what these components actually do when in the context of an analogue recording desk.
Thanks for the help guys, I'll probably try cross posting this in /m/ but I'm not sure about the expertise of the guys over there.
7 posts omitted. Click View Thread to read.
>>
Simon Genderfield - Mon, 03 Feb 2014 04:42:44 EST U0IJI7OT No.6113 Reply
>>6112

Obviously there is a transformer to bring the AC voltage to a decent lower value, which I forgot to mention.
>>
Doris Cricklespear - Mon, 10 Feb 2014 22:12:36 EST kU/b2Op8 No.6129 Reply
>>6112
Filters are also used in D-Class amps, where a signal is converted to a digital pwm signal. the digital is converted back to analogue at a different voltage using a low pass of some kind.
filters dont need to be LRC circcuits, opamps do it as well or better, with a steeper frequency response and less phase shift. just fyi
>>
Eliza Semmlefure - Fri, 14 Feb 2014 06:37:04 EST PDTgKfh5 No.6132 Reply
>>5631
Go to khanacademy.com and watch everything in the Calculus and Differential Equations sections, then go to libgen.info and torrent a few EE textbooks.
Do you really think you're going to learn four years of EE in an image board post?
Granted you only really need to learn basic circuits, electronics, and signals, but if you're not willing to put in the time, you're never going to really understand what's going on.

DIY LED-lighting

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- Fri, 31 Jan 2014 09:09:43 EST 5NXy03ws No.6109
File: 1391177383025.jpg -(84957B / 82.97KB, 1024x768) Thumbnail displayed, click image for full size. DIY LED-lighting
So heres the situation:

I want to grow weed. Suprise. The system need to be extremely stealth because i got lot of neighbors and friends hanging around my apartment.

>no sound
>no smell
>no light leaks
>small size
>energy efficient


Ok so computer case is my best option. I can do activated carbon filter myself but lights are the main reason why im here. I dont know how to make my own LED-panel. Commercial lights are too big, wrong shape and they have build-in cooler which makes them noisy.

So heres the deal:

Can someone tell me how to make my own panel? Simple as possible. Blueprints and stuff you know.

Because setup is going to be in computer case and need to be noise free, watts need to be low as possible to keep heat down. Heat sink and small computer cooling fan need to be enough for the whole system.

What are the best way to go with this kind of setup? Few powerfull quality leds?

It would be cool also if you tell me some good shops in europe where i can get all what i need. Shoplist with links would be real great.

And btw Lowryder is the strain i got.

Here is something what it should look like
https://www.icmag.com/ic/showthread.php?t=146324

I really appreciate if someone be able to help. Thanks a lot.
14 posts and 3 images omitted. Click View Thread to read.
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Doris Cricklespear - Mon, 10 Feb 2014 22:04:56 EST kU/b2Op8 No.6128 Reply
1392087896169.jpg -(20525B / 20.04KB, 591x370) Thumbnail displayed, click image for full size.
>>6116
>The peaks are for red, 625-675 nm
the peaks are a the bounds of that interval, the interval is depending on the plant though. anyway, with the peak of the led somewhere in the middle shouldnt that be suboptimal? also, chlorophyl a is found in bigger amounts, afaict from wikipedia.
>>6117
that pic shows plants can take a lot of bandwidth between red and green, here's another one. it alludes me, that little red and blue should be enough. some have linked raisin production quality to lighy quality.

for electrical egineering, what was the engineering part, did you design the psu? did you work with a biologist?

>>6121
everyone does build led panels these days. doing it cheap and well is the hard part. needs a degree just for the cost analysis
>>
Fanny Snodwater - Tue, 11 Feb 2014 07:25:49 EST CKZoWqYh No.6130 Reply
>>6128
We tried to aim for within the peaks of chrlophyll a and b. Other wavelengths do affect the plant and all the mechanisms are not understood. I read a study from Sweden for example where green light affected the taste of herbs even though it should just bounce off when you think of it.
Illumination engineering here is a subset of electrical engineering. Designing street lighting, office lighting, plant lighting and everything involved with lighting basically.
We didn't work with any biologists but there are guys at the university who are researchers in plant lighting so they gave us some material and helped us out. For example this guy, a Ph.D. in EE who did it about plant lighting with LED. http://lightinglab.fi/personnel/ppinho.html
>>
Fanny Snodwater - Tue, 11 Feb 2014 09:09:18 EST CKZoWqYh No.6131 Reply
>>6128
A guy in our group did his bachelor about building a control and PWM-system for the lamp, though. Still, electrical engineering isn't only about power systems but includes a lot more.

Free information thread go!

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- Mon, 29 Jul 2013 15:59:46 EST Jr33UkvF No.5815
File: 1375127986191.jpg -(23049B / 22.51KB, 500x384) Thumbnail displayed, click image for full size. Free information thread go!
So, I`m a great fan of free information and I came across this site today

http://ocw.mit.edu/index.htm

A lot of you probaly already know about it. It is a huge source of data regarding prettymuch every type of engineering. Please share with us any interesting free information source regarding engineering.
2 posts omitted. Click View Thread to read.
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M - Wed, 31 Jul 2013 12:14:28 EST Jr33UkvF No.5822 Reply
>>5818
wow thanks a lot for those, really interesting stuff there
>>
Doris Bevingdutch - Thu, 01 Aug 2013 01:15:23 EST y4QqaCQl No.5823 Reply
1375334123518.png -(573517B / 560.08KB, 720x400) Thumbnail displayed, click image for full size.
%spoiler that doesn't apply here%
>>
Lydia Grandbury - Fri, 24 Jan 2014 19:11:26 EST CmnGBHIs No.6107 Reply
edx.org or edx.com

BRUK BRUK BRUK BRUK

How to Splice Headphone wires

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- Sat, 08 Jun 2013 22:08:06 EST 4fpX8pqx No.5726
File: 1370743686987.jpg -(137781B / 134.55KB, 2096x488) Thumbnail displayed, click image for full size. How to Splice Headphone wires
Hey look at these headphone wires. I stripped the big black wire. Then I get these 3 wires. But look CLOSELY! See the fuzzy white stuff? It's like a wire inside the wire. Do I need to strip 1 more time? What is that white stuff?

I don't mean to sound rude. Thanks for the help.
7 posts and 2 images omitted. Click View Thread to read.
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David Tillinghall - Sun, 30 Jun 2013 12:36:00 EST IawMSZ+a No.5776 Reply
I still haven't gotten around to fixing these... but when I do, I'll be sure to tell you.
>>
Nell Duckstone - Sat, 03 Aug 2013 23:53:10 EST x57V/kbu No.5824 Reply
Not pro tips:

Burn the white nylon with a lighter.

THe wires have non-conductive enamel on them. Untwist the wire, and but the enamel off. You need to blow it out quickly, or else you'll make the wire brittle.

Headphone wires are shit to solder. Use a small bit of copper wire as a scaffold.

Stereo is kinda pointless. Your shitty soldering job will hurt the quality of the sound anyway, so just wire it to be mono. I guess for games and movies you want stereo, but for music mono's fine.

Where to find knowledge

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- Sat, 11 May 2013 19:16:29 EST RqK0DV1Q No.5641
File: 1368314189504.jpg -(775702B / 757.52KB, 1024x768) Thumbnail displayed, click image for full size. Where to find knowledge
Currently looking for "John Bellamy Digital Telephony" eBook

Help
>>
Shit Clottingdirk - Wed, 15 Jan 2014 02:14:22 EST mbW+t54X No.6098 Reply
>>6097
Shit just bumped a really OLD thread. sorry,
nb

dmt vape

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- Thu, 09 Jan 2014 15:34:34 EST JJaFAAPc No.6096
File: 1389299674103.jpg -(439981B / 429.67KB, 1850x850) Thumbnail displayed, click image for full size. dmt vape
Greetings engineers, I really want to vape my DMT through a pen but could not find a kit that would reach low enough temperatures(140-178F). Most vape pens burn in the 400F range and would burn DMT. However I did find a 3-6 volt adjustable battery and 4.5 ohm atomizer. Do you think that is enough resistance to safely reach the desired vaporizing temperatures?

Torsion Springs n stuff

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- Fri, 22 Nov 2013 20:26:17 EST 0/Zz0xo3 No.6008
File: 1385169977078.jpg -(77571B / 75.75KB, 800x602) Thumbnail displayed, click image for full size. Torsion Springs n stuff
Hello Tesla, and may I say, I love your namesake.
I recently became interested in torsion springs, but for the life of me I can't figure out how to buy them. How do I tell what they can hold/do? For instance, this spring:
http://www.amazon.com/Torsion-Spring-065W-62M-270L/dp/B00GO7HIBW/ref=sr_1_14?s=industrial&ie=UTF8&qid=1385166448&sr=1-14
Can someone explain to me what each of the parts of ".065W .62M 270L MW" mean? Thanks a bunch.
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Esther Nadgetag - Sat, 23 Nov 2013 17:54:36 EST 0/Zz0xo3 No.6009 Reply
1385247276078.png -(13151B / 12.84KB, 438x329) Thumbnail displayed, click image for full size.
>>6008
Okay, so apparently .065W is the "wall" of the spring (the diameter of the metal itself), 270L is the type of metal, MW is "machine wound", and I can only assume .62M is the spring's total diameter.
>>
Jack Tillingville - Tue, 03 Dec 2013 20:53:27 EST W6qmmfPc No.6021 Reply
>>6012
Isn't that what you wanted to buy? Have you bought it yet? What? You didn't want to buy it? Why would you click on something if you didn't want to buy it? No, you want to buy it. We'll show it to you in ads in case you forgot. Well did you remember to buy it? BUY IT.

Computer Engineering or Electrical

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- Wed, 28 Aug 2013 10:37:35 EST daBibOpE No.5856
File: 1377700655680.png -(525908B / 513.58KB, 605x800) Thumbnail displayed, click image for full size. Computer Engineering or Electrical
I'm going to study either one of these next year. I've had a bit of experience in programming chips and also I've made hobby electrical shit.
Right now I want to get on top of the maths. I've heard that computer engineering uses a lot of linear algebra. I've tried looking it up on Khan Academy but I'm not sure what I should be looking for there. All the linear stuff looks like grade 8 stuff. Can anyone give me some resources on what I should be studying?
Also, an idea on what kind of math I should be studying for EE would be great.

komatsu

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- Sat, 04 Jan 2014 11:35:12 EST DMR//ClT No.6090
File: 1388853312050.jpg -(49755B / 48.59KB, 434x489) Thumbnail displayed, click image for full size. komatsu
i need a service manual to komatsupc200, i m made a giant grinder with pc200, for stones , if nobody help, i can aid in future with service in this machines.

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