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

/a/ - Anime & Manga Discussion Now Available
3d Printing Ignore Report View Thread Reply
Nicholas Shittingfield - Tue, 04 Mar 2014 18:06:15 EST ID:kWAgYbio No.6184
File: 1393974375035.jpg -(2230224B / 2.13MB, 3845x2889) Thumbnail displayed, click image for full size. 2230224
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 ID:nSYRePSf No.6228 Ignore Report Reply
>reinventing the basic metal screw.

Self Sealing Stembolts?
dave !N5MvbCntdE - Sat, 19 Apr 2014 14:50:17 EST ID:WCjzl674 No.6263 Ignore Report 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 ID:kWAgYbio No.6282 Ignore Report Reply
Nope, it has more has to do with solving a long dismissed problem on guitars.

Stairclimber wheels Ignore Report View Thread Reply
Samuel Hunderwidge - Sun, 19 May 2013 11:31:09 EST ID:t6Yu9g/A No.5663
File: 1368977469052.jpg -(110736B / 108.14KB, 1000x598) Thumbnail displayed, click image for full size. 110736
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 ID:MOd48Kn3 No.6239 Ignore Report 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 ID:8GdYYP4I No.6240 Ignore Report Reply
fewer moving parts?
Nathaniel Buncocke - Fri, 18 Apr 2014 17:50:39 EST ID:xZgv+GY1 No.6258 Ignore Report Reply
ur mom feels rough when im riding her

dumb and bad device idea Ignore Report View Thread Reply
Oliver Fallermork - Mon, 14 Apr 2014 10:31:01 EST ID:7zEswIka No.6251
File: 1397485861729.jpg -(61737B / 60.29KB, 700x465) Thumbnail displayed, click image for full size. 61737
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 ID:7zEswIka No.6252 Ignore Report Reply
plus you could radio tracks before the album comes out

Pilot Plant Real Book Ignore Report View Thread Reply
Edward Disslefuck - Wed, 09 Apr 2014 00:53:09 EST ID:UC+qXdSi No.6241
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Does anybody have a pdf of it?

Mimic a Remote's IR Code Ignore Report View Thread Reply
Faggy Febberput - Thu, 27 Mar 2014 01:47:11 EST ID:FABnkK5n No.6232
File: 1395899231735.jpg -(144845B / 141.45KB, 720x540) Thumbnail displayed, click image for full size. 144845
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 ID:xZgv+GY1 No.6236 Ignore Report 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
Comment too long. Click here to view the full text.
Basil Dezzletig - Mon, 31 Mar 2014 08:38:40 EST ID:+llB3/RB No.6237 Ignore Report 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 ID:DPsZhwc3 No.6238 Ignore Report Reply
Well I give up.
Thanks anyway though!

Chinese 60 years behind the space race Ignore Report View Thread Reply
Hedda Creffingdock - Mon, 10 Feb 2014 09:18:46 EST ID:9tRAlAIb No.6126
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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 ID:nSEO9O+z No.6222 Ignore Report 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 ID:5IdDtd2q No.6223 Ignore Report 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 ID:TLtnKWTx No.6231 Ignore Report Reply
I feel bad for the midged inside

Metal Wire Coating Ignore Report View Thread Reply
Ernest Pockville - Sun, 23 Mar 2014 14:28:35 EST ID:uEfymhfr No.6224
File: 1395599315823.jpg -(42328B / 41.34KB, 600x509) Thumbnail displayed, click image for full size. 42328
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 ID:uEfymhfr No.6227 Ignore Report Reply
Sir, I think the black wire is the ground
John Dartfield - Mon, 24 Mar 2014 13:47:20 EST ID:gxnGDEmu No.6229 Ignore Report Reply
it's the shielding which is connected to ground?
that stops radio and other signals from interfering
Nigger Nonkinnatch - Mon, 24 Mar 2014 14:16:11 EST ID:uEfymhfr No.6230 Ignore Report Reply

Space Station 13 Ignore Report View Thread Reply
Lillian Beblingdudging - Thu, 05 Sep 2013 06:09:36 EST ID:qcML6joZ No.5879
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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.
Priscilla Turveyville - Mon, 09 Sep 2013 21:35:02 EST ID:KFZ9rgNf No.5889 Ignore Report Reply
Doris Dartworth - Sun, 16 Mar 2014 09:09:46 EST ID:RG6LVbQe No.6221 Ignore Report Reply
420chan now has its own SS23 server.

So Engineer
very practical problem

Forced semester off, can study ahead online? Ignore Report View Thread Reply
Edwin Ferryshit - Thu, 13 Mar 2014 22:27:21 EST ID:9+I+k5VX No.6216
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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.)
Isabella Gemmerson - Thu, 13 Mar 2014 23:31:52 EST ID:CKZoWqYh No.6217 Ignore Report Reply
MIT has a lot of open course material
Augustus Sombleford - Fri, 14 Mar 2014 18:40:42 EST ID:gJ2Omk9E No.6219 Ignore Report Reply
Personally I'd study the textbook in advacnce. Find out what textbook the instructor uses.

Logging Circuit Ignore Report View Thread Reply
Walter Daffingwell - Thu, 13 Mar 2014 03:13:51 EST ID:4fpX8pqx No.6210
File: 1394694831517.png -(3606B / 3.52KB, 118x44) Thumbnail displayed, click image for full size. 3606
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 ID:2POYse6P No.6215 Ignore Report 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 ID:4fpX8pqx No.6218 Ignore Report 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? Ignore Report View Thread Reply
Anonymous - Sat, 22 Feb 2014 19:18:54 EST ID:kU/b2Op8 No.6154
File: 1393114734756.jpg -(37260B / 36.39KB, 385x384) Thumbnail displayed, click image for full size. 37260
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 ID:kU/b2Op8 No.6204 Ignore Report Reply
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>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 ID:NimfZmq9 No.6209 Ignore Report 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 ID:kahK/jZ9 No.6225 Ignore Report Reply
The fan needs volts to start not amps
Some 12volt fans do start on 5volt you might consider getting one.

Engineering youtube channels Ignore Report View Thread Reply
Charles Cheddlestone - Thu, 06 Mar 2014 16:33:04 EST ID:CKZoWqYh No.6195
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Post some good ones.
I only have found this one:
EEVblog, some Aussie who does electronics videos.

Amplifier Circuitry Ignore Report View Thread Reply
Barnaby Nongershaw - Mon, 03 Mar 2014 10:40:09 EST ID:MM8P09Mv No.6173
File: 1393861209505.jpg -(1136712B / 1.08MB, 2048x1536) Thumbnail displayed, click image for full size. 1136712
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 ID:kWAgYbio No.6185 Ignore Report 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 ID:2POYse6P No.6186 Ignore Report 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 ID:MM8P09Mv No.6189 Ignore Report 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 Ignore Report View Thread Reply
Walter Hummlepit - Sun, 02 Mar 2014 07:28:45 EST ID:cqsZD3rA No.6170
File: 1393763325374.jpg -(73384B / 71.66KB, 387x381) Thumbnail displayed, click image for full size. 73384
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 ID:cqsZD3rA No.6171 Ignore Report 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 ID:kU/b2Op8 No.6172 Ignore Report 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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