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3d Printing

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- Tue, 04 Mar 2014 18:06:15 EST kWAgYbio No.6184
File: 1393974375035.jpg -(2230224B / 2.13MB, 3845x2889) Thumbnail displayed, click image for full size. 3d Printing
Hey /TESLA/, I recently came across an invention that involves reinventing the basic metal screw.
I've been looking into 3d printers so I don't have to take my idea to China. Though I am filing a patent soon and I may be forced to outsource it.
I'm just looking for experts on the subject, maybe direct me to the cheapest, most practical personal-use 3d printer that only produces small stuff.
I'm searching, but so far all I'm finding are these massive rigs for making guns and engines lol
7 posts and 1 images omitted. Click View Thread to read.
Charlotte Sunkinpack - Mon, 24 Mar 2014 04:48:18 EST nSYRePSf No.6228 Reply
>reinventing the basic metal screw.

Self Sealing Stembolts?
dave !N5MvbCntdE - Sat, 19 Apr 2014 14:50:17 EST WCjzl674 No.6263 Reply
I'm thinking of getting a reprap kit to make my own plastic parts, and maybe consumer goods. they're getting cheaper than photo printers which is cool.
Anybody have advice for a 3D printing n00b?
Oliver Tillingworth - Fri, 25 Apr 2014 04:13:12 EST kWAgYbio No.6282 Reply
Nope, it has more has to do with solving a long dismissed problem on guitars.

Stairclimber wheels

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- Sun, 19 May 2013 11:31:09 EST t6Yu9g/A No.5663
File: 1368977469052.jpg -(110736B / 108.14KB, 1000x598) Thumbnail displayed, click image for full size. Stairclimber wheels
So how come these never caught on?
4 posts omitted. Click View Thread to read.
John Brookspear - Thu, 03 Apr 2014 16:03:14 EST MOd48Kn3 No.6239 Reply
It looks like it would feel rough to have the triwheel rotate while riding in it.
Barnaby Blenkinchitch - Sat, 05 Apr 2014 12:44:10 EST 8GdYYP4I No.6240 Reply
fewer moving parts?
Nathaniel Buncocke - Fri, 18 Apr 2014 17:50:39 EST xZgv+GY1 No.6258 Reply
ur mom feels rough when im riding her

dumb and bad device idea

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- Mon, 14 Apr 2014 10:31:01 EST 7zEswIka No.6251
File: 1397485861729.jpg -(61737B / 60.29KB, 700x465) Thumbnail displayed, click image for full size. dumb and bad device idea
DRM to the ears. earbuds that take an encrypted digital signal to a digital circuit in each earbud, which then decrypts it, and then energizes a driver - with almost no wire - attached directly to the center of the IC. securely give audio to humans only.

:x i think it would be pretty cool though. perhaps if music generated more revenue, the music released would be much better. none of this good faith enough people are buying it bullshit
Oliver Fallermork - Mon, 14 Apr 2014 10:32:22 EST 7zEswIka No.6252 Reply
plus you could radio tracks before the album comes out

Mimic a Remote's IR Code

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- Thu, 27 Mar 2014 01:47:11 EST FABnkK5n No.6232
File: 1395899231735.jpg -(144845B / 141.45KB, 720x540) Thumbnail displayed, click image for full size. Mimic a Remote's IR Code
My goal is to make a little circuit with an IR LED that can function as the original remote. So I need to somehow "learn" that original code from the original remote and program that into the circuit.

Is this possible? I know that a hacked PSP can do it.
3 posts omitted. Click View Thread to read.
Frederick Depperhall - Sun, 30 Mar 2014 01:41:43 EST xZgv+GY1 No.6236 Reply
do you have the original remote?

if you do you can press the button and receive it in the other end with a circuit

the circuit is kinda involved, but it's easy if you're willing to learn

basically the signal is gonna come in as a square wave and you're going to have to grab that bit by bit, and turn in into a word, how ever long it might be.

i can't imagine the remote outputting more than 16 bits of information per button but i could be wrong, testing something like that might require an oscilloscope, but you might be able to find one at a hackerspace or something

to turn it bit by bit to a word you need something that's called sipo shift register which stands for serial in parallel out shift register. you might need a clock for one of those as well, and the clock speed might need to match the speed of the remote output though if you're clever you can get by that with a microcontroller or some clever circuitry but i'm not getting into that

and the output of that goes into a data buffer

and then from that you can either output it to LEDs through individual buffers and read the codes of the buttons like that

so that's a whole circuit just for determining what's coming out of your remote

if you now want to output that you need to do the opposite, except now you can map with memore diffent output combinations to differnt buttons depending on what you recorded

does what i wrote make sense?
Basil Dezzletig - Mon, 31 Mar 2014 08:38:40 EST +llB3/RB No.6237 Reply
1396269520444.jpg -(197292B / 192.67KB, 564x423) Thumbnail displayed, click image for full size.

There is a lot of various circuits
Simplest build is like 5 parts
Software will take care of the rest
Sidney Clenkinweg - Tue, 01 Apr 2014 13:51:36 EST DPsZhwc3 No.6238 Reply
Well I give up.
Thanks anyway though!

Chinese 60 years behind the space race

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- Mon, 10 Feb 2014 09:18:46 EST 9tRAlAIb No.6126
File: 1392041926891.jpg -(282326B / 275.71KB, 752x1063) Thumbnail displayed, click image for full size. Chinese 60 years behind the space race
Why did the Jade Rabbit moon rover fail /tesla/ ;_;


Trap card: Most of the Chinese engineers who developed it would have got theirs Masters and Docotrates from American Universities. I'm looking at you, Cal-Tech. and UCLA
2 posts and 1 images omitted. Click View Thread to read.
Graham Honeyman - Fri, 21 Mar 2014 22:38:15 EST nSEO9O+z No.6222 Reply
>During this time temperatures plunge to -170 degrees Celsius (-274 degrees Fahrenheit) and Jade Rabbit – which is powered by solar panels – must enter into a hibernation state to preserve its core systems.
Why the fuck would extreme cold hurt it? Preserve it's core systems? The dragon that powers it? Can't it boot up again after gathering energy after the lunar night?

>"If this journey must come to an early end, I am not afraid. Whether or not the repairs are successful, I believe even my malfunctions will provide my masters with valuable information and experience.
Yeah, maybe not to write half assed buggy software next time? Just making guesses...
Augustus Dummermetch - Fri, 21 Mar 2014 23:04:23 EST 5IdDtd2q No.6223 Reply
space grade dragons and electronics alike are usually just not made to resist those low temperatures. or should i say, resist very low temps too good? get it?
Hugh Chosslefield - Tue, 25 Mar 2014 11:01:01 EST TLtnKWTx No.6231 Reply
I feel bad for the midged inside

Metal Wire Coating

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- Sun, 23 Mar 2014 14:28:35 EST uEfymhfr No.6224
File: 1395599315823.jpg -(42328B / 41.34KB, 600x509) Thumbnail displayed, click image for full size. Metal Wire Coating
I'm trying to connect two different USB cords together, but one of them has this metal coating.
Is this a 5th contact or what does it do?
1 posts omitted. Click View Thread to read.
Nigger Nonkinnatch - Mon, 24 Mar 2014 01:06:26 EST uEfymhfr No.6227 Reply
Sir, I think the black wire is the ground
John Dartfield - Mon, 24 Mar 2014 13:47:20 EST gxnGDEmu No.6229 Reply
it's the shielding which is connected to ground?
that stops radio and other signals from interfering

Space Station 13

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- Thu, 05 Sep 2013 06:09:36 EST qcML6joZ No.5879
File: 1378375776066.png -(191008B / 186.53KB, 896x909) Thumbnail displayed, click image for full size. Space Station 13
There is so much engineer in this game, I don't think I've seen so much engineer in a game since Team Fortress 2.

So much engineer, so many Practical Problems.
Doris Dartworth - Sun, 16 Mar 2014 09:09:46 EST RG6LVbQe No.6221 Reply
420chan now has its own SS23 server.

So Engineer
very practical problem

Forced semester off, can study ahead online?

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- Thu, 13 Mar 2014 22:27:21 EST 9+I+k5VX No.6216
File: 1394764041986.gif -(902889B / 881.73KB, 312x176) Thumbnail displayed, click image for full size. Forced semester off, can study ahead online?
Hey /Tesla/,

I was taking Calculus and CS courses last semester, but was suspended from registration due financial issues. These were both prerequisite classes for my intended major.

My question is are there any websites or libraries besides Khan academy that I could use to study Physics, Statics, and or Heat dynamics?
(Preferably with proper notation and formula.)
Augustus Sombleford - Fri, 14 Mar 2014 18:40:42 EST gJ2Omk9E No.6219 Reply
Personally I'd study the textbook in advacnce. Find out what textbook the instructor uses.

Logging Circuit

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- Thu, 13 Mar 2014 03:13:51 EST 4fpX8pqx No.6210
File: 1394694831517.png -(3606B / 3.52KB, 118x44) Thumbnail displayed, click image for full size. Logging Circuit
I wouldn't know where to begin here, but I need to log the opening of a small door.
So I could have some kind of circuit, and there would be little metal contacts on the door and the hinge, then whenever the door is opened -> circuit broken -> log that somehow.

Does anyone know I could make this logging device?
Nigger Cheffingville - Thu, 13 Mar 2014 21:01:18 EST 2POYse6P No.6215 Reply
arrange it so when the door is opened, a lever moves and presses down on a key on a manual typewriter.
OP - Fri, 14 Mar 2014 11:08:49 EST 4fpX8pqx No.6218 Reply
While that would get the number of opens, what I'm looking for is the time/dates of them.

I've done this by setting up a webcam that activates when it detects motion.

fucking smps - how do they work?

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- Sat, 22 Feb 2014 19:18:54 EST kU/b2Op8 No.6154
File: 1393114734756.jpg -(37260B / 36.39KB, 385x384) Thumbnail displayed, click image for full size. fucking smps - how do they work?
hi tesla,
i'm building a led panel with integrated fan and don't know how to run a pc fan from the same voltage source. the fan is rated 12V @ 450mA, the supply does up to 1A and has 5V left after the leds. the fan needs probably 2A at startup and it should also run when the leds are off.

a switch mode dc/dc converter seems a good idea. it should boost the 5V to somewhere between 6 and 10 V and also deal with the excess voltage when leds are turned off, ie. short circuited via dpdt switch. a look at wikipedia tells me buck-boost or sepic converters can do that.
downsides, what to watch out for? don't most those converters hardly work in parallel?
are there alternatives? a zener would be enough to limit the volts but only with an ohmic load.

i want to learn the basics and take a closer look, just asking if i am headed in the right direction basically.
9 posts and 3 images omitted. Click View Thread to read.
Cedric Diblingbanks - Sun, 09 Mar 2014 15:52:51 EST kU/b2Op8 No.6204 Reply
1394394771532.jpg -(77825B / 76.00KB, 1024x768) Thumbnail displayed, click image for full size.
>Where is this 36V coming from? I thought your power supply was only 12V. And what's the point of the RC in front of the switcher? The resistor is only going to burn current that's used by your fans
The PSU is 36V, Vout is the regulated 5V.
The powerloss of R5 is only 0.2W, no biggie. The current spikes on the switcher input would be way too high for the psu, judging by the specs. Although the supply might withstand that, i am not gonna risk it. the capacity of the filter was chosen randomly. if you criticized that, i would understand. tips for choice of the the cap would be welcome, there are so many types and i need them rated for the voltage and ripple current,

12V on the fan would be nice to have, but it should run with less and quieter at that.

>If you want it to start up slower, why wouldn't you just increase R8? There's no need for the inductor.
Don't want the rise time of U_DS too high. Don't know if it really matters.
>It's a 5V step-down regulator
No, this is a lt1076. You might think of lt1076-5. That one i didn't know, it's interesting.

I am still concerned if the switch topology is suitable. There's so much more to learn and this project gives me a reason to explore.
Jarvis Faddlekane - Thu, 13 Mar 2014 02:50:50 EST NimfZmq9 No.6209 Reply
admittedly, it's written a bit confusing. first i didn't understand myself when i just reread.
The resistor in front of the switcher IC has to be at least 36 Ohm so that the current is limited to 1A, because else the voltage might be cut off by the overpower protection of the PSU.
nb because you show not much interest
Archie Simmerkadge - Sun, 23 Mar 2014 15:54:37 EST kahK/jZ9 No.6225 Reply
The fan needs volts to start not amps
Some 12volt fans do start on 5volt you might consider getting one.

Amplifier Circuitry

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- Mon, 03 Mar 2014 10:40:09 EST MM8P09Mv No.6173
File: 1393861209505.jpg -(1136712B / 1.08MB, 2048x1536) Thumbnail displayed, click image for full size. Amplifier Circuitry
Soup /tesla/

The other day, I plugged in my 100W solid state Marshall Reverb, and the only noise to come out of the speakers was the loudest, most irritating buzzing noise.

So I exposed the circuit board and turned it on. Some sparks shot out from somewhere very close to those two blue "things". Dammit, Jim. I'm a musician, not an engineer.

Now, assuming the actual circuit board isn't fucked, how would I go about replacing those? What are they even called?

I already tried to get the reverb pan fixed by Marshall, but it's so old that they don't want to fuck with it.
10 posts and 2 images omitted. Click View Thread to read.
Nicholas Shittingfield - Tue, 04 Mar 2014 18:19:59 EST kWAgYbio No.6185 Reply
Do a shit ton of research and find youtube videos/stories is my advice. Amp repair guys are all "guru's" and they'll charge you guru price for any kind of repair.
Eugene Baffingmit - Tue, 04 Mar 2014 19:45:15 EST 2POYse6P No.6186 Reply
>Looks like you blew the capacitor on the left
based on what evidence?

>As in, you could die doing it if you fuck up.
this is incredibly unlikely from a 50V cap. stop scaremongering.
Oliver Blatherdock - Wed, 05 Mar 2014 09:49:57 EST MM8P09Mv No.6189 Reply

>Amp repair guys are all "guru's" and they'll charge you guru price

Naw, the guy I know probably won't charge me anything. I just don't want to have to wait.

spycam reverse engineering

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- Sun, 02 Mar 2014 07:28:45 EST cqsZD3rA No.6170
File: 1393763325374.jpg -(73384B / 71.66KB, 387x381) Thumbnail displayed, click image for full size. spycam reverse engineering
Hello /tesla/, any idea what this chip do?
I've got a STK3350 spycam, but i have other ideas to it. i want to modifiy it to drive an RC car over wifi, and i want to reverse engineer it. i can telnet into it can enable ftp, it has busybox, has a MIPS cpu and the wifi "shield" has tons of GPIO, even the system itself has a GPIO executable binary but i don’t know how to work it. Any idea where to start?
Walter Hummlepit - Sun, 02 Mar 2014 07:48:22 EST cqsZD3rA No.6171 Reply
1393764502374.jpg -(553976B / 540.99KB, 2048x1536) Thumbnail displayed, click image for full size.
this is the wifi module on top of the video module. The page it loads tell me that this is is a RT5350 module, but the system loads an RT2860... the under the masked part there is only MAC some 2d code, and a serial number.
Cyril Narrypirk - Sun, 02 Mar 2014 10:58:45 EST kU/b2Op8 No.6172 Reply
is that the mips soc?
you probabbly searched for the part number and didn't find a datasheet because the manufacturer hasn't published it to the public or it is written in moonrunes.
the function of the chip is easier to guess when knowing where on the board it is and where it connects to.
maybe the RT2860 ... driver(?) works for both versions.
you assume the GPIO executable binary is a cmd to modify the ports? your expression is not quite clear.

reverse engineering is no picnick. if you are lucky there is a compiler tool chain, for mips there is, i guess, if not you write one, at least asm/disasm (and linker?). disassemble the gpio cmd, extract the bootloader, map memory regions, write you own procedures as PoC come to mind.

i really have no idea though, it seems easier to build your own or use ready made RC stuff. i was looking for camera modules before, shit is expensive.

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