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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.

Learning to recycle old electronics (components) by Fanny Blonnerstere - Tue, 14 Nov 2017 19:16:29 EST ID:zIm1Srig No.7158 Ignore Report Reply Quick Reply
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HI guys. This board seemed more suitable than /tech/.

My dear dad just passed away. He was an electronics hoarder (according to my mom at least). He collected a ton of broken, old or discarded but still working electronic equipment in my parent's garage. My dad was more of a collector than electrical engineer. He knew how to solder neatly and could name some components and what their specs meant. But he never really made anything out of his collection. One of the few things I remember was him fixing a radio that needed a component change.

My mom wanted to throw away all the "junk" when dad died, but I ended up taking most of them. I love electronics but I've never been good at them on a technical level. I'm more of a software guy. I know my basic electronics from physics class up until ohm's and kirchoff's laws. I can read a circuit diagram and have some clue about voltage, current and resistance. I'm not a complete noobie, but I'm still really really bad at electronics and have no idea how to approach a project.

I wanna recycle the old stuff my dad left. Salvage individual components, test to see if they work, organize them according to their properties, and make something new from them. My dream for a while has been building a radio transmitter. I've already got a super cool AM/FM receiver that can do all sorts of magic tricks but I lack a transmitter. I've done some googling, but a lot of it flies over my head.

So, I need sources about electronics. I want to learn. My dad left me a soldering iron so I got that covered. I probably should get some tools to remove singular components from circuit boards. The biggest issue is finding out if the components are still functional. Some of the stuff is from the 60s! Any easy way to do so?

Sorry for being all over the place with this post. I only took the mandatory electronics classes so I'm pretty intimidated. No clue where to start building my radio for example. Should I just pick everything apart and then start assembling components that fit together? There are plenty of radio transmitter schematics online.
3 posts and 1 images omitted. Click Reply to view.
Cyril Sicklepere - Sat, 13 Jan 2018 02:03:33 EST ID:l8g6dMpE No.7162 Ignore Report Quick Reply
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Not OP, but long time lurker here
I wish I could upvote that post, thanks for that info its useful in all its forms. Have one internet.
Hannah Deffingsteck - Sat, 31 Mar 2018 13:50:05 EST ID:IZhvBj47 No.7185 Ignore Report Quick Reply
Keep in mind though that you can get pretty much any common component from aliexpress these days for 1/3rd to 1/10th the price of retail on digikey, delivered.
Most of these will be even genuine parts because they are surplus stock from high volume productions.
I pay under $1 for STM32F103 microcontrollers for instance.

In general if something is sold on aliexpress or not is generally a good sanity check if a component is worth using in a design. Because if it isn't means that it isn't being used in consumer electronics and means information on it will be scarce.
Second: Never buy ICs where you can't find independent either a library for it on github or some discussion on a forum about it. This means they are meant to be used in special designs very close knit contract manufacturing.

My mantra is: When it comes to ICs there is absolutely nothing wrong with mainstream.
David Faddlelock - Fri, 06 Apr 2018 08:53:19 EST ID:gG97Tn7x No.7188 Ignore Report Quick Reply
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The Art of Electronics, by Paul Horowitz and Winfield Hill, is a good start, and there's a complementary text, Student Manual for The Art of Electronics by Thomas C. Hayes and Paul Horowitz.

Apart from that, you could ask around at Lainchan, that's where all the cyberpunk kids hang out.
And I mean the real Lainchan.org, not the graveyard copycat at .jp.
Phoebe Magglegold - Fri, 06 Apr 2018 14:27:59 EST ID:IZhvBj47 No.7189 Ignore Report Quick Reply
The first thread on their programming board is about FORTH
lol, shit, thanks dude I can't tell if I should smile or cry.
Betsy Hizzleforth - Wed, 25 Apr 2018 04:33:23 EST ID:lErcgTIf No.7193 Ignore Report Quick Reply
De nada, Lainchan is a well kept secret. Lord knows they could do with more tech traffic and less drama.

Jobs by Augustus Chellyson - Thu, 18 Jan 2018 19:16:58 EST ID:+f2IvV05 No.7163 Ignore Report Reply Quick Reply
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Just got my first job offer for an equipment engineering position. BS in mech eng. Debt free thanks to uncle sam.

55k/yr + EoY bonus, avg 8k
company car + insurance/maintenance/gas
paid expenses for travel around the country and internationaly (mexico, canada, japan)
company credit card
phone allotment

with a 2.81 GPA that they didn't even ask about.

stay in school nerds.
James Farryson - Fri, 23 Mar 2018 22:36:04 EST ID:uF4LZrh/ No.7179 Ignore Report Quick Reply
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>BS in mech eng
>55k starting

you got low balled *hard*. who are the swindlers who conned you into accepting that offer? also,

>2.81 GPA

makes even more sense that they were able to flim flam you so easily.
Reuben Fenkinketch - Wed, 28 Mar 2018 13:16:20 EST ID:57dUc+ts No.7183 Ignore Report Quick Reply
I live in ohio
Reuben Fenkinketch - Wed, 28 Mar 2018 13:45:32 EST ID:57dUc+ts No.7184 Ignore Report Quick Reply
They told me in my school's career center that 55-60k was what could expect starting out and with that eoy bonus I'm looking at 60k at least. Glassdoor says 67 in Ohio though for entry level mech eng.... I'll be looking for a new job in a year or two anyway. This isn't a very interesting job tbh. Not nearly as much design work as I'd like.
Samuel Dirringdale - Fri, 20 Apr 2018 10:21:19 EST ID:OIsgto+6 No.7191 Ignore Report Quick Reply
55k/yr? thats cool bro
People that couldnt graduate highschool make 100-150k a year in the oilfields their first year.

Mech eng jobs in Dubai by Dean James - Tue, 03 Apr 2018 09:26:07 EST ID:w3XZoMCx No.7187 Ignore Report Reply Quick Reply
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is the opportunity of mech eng jobs in dubai good? or maybe in other places in U.a.e.? what are the companies that are usually found there? i needed help cause i dont have much friends who know about engineering jobs there. if you have additional advice please do tell. i need all the help that i could get.
Eliza Sucklesodge - Sat, 14 Apr 2018 09:18:01 EST ID:l8g6dMpE No.7190 Ignore Report Quick Reply
Well, if you`d want to work in oil, you can score a nice job there, besides that industry it will be a lot harder I guess

How fix roof by Emma Turveydale - Sun, 25 Jun 2017 13:54:25 EST ID:nZyDw8HR No.7137 Ignore Report Reply Quick Reply
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idk where to ask this but engineers pls help
i have this wooden shack in the garden and the roof is rotten and it leaks when storm.
i can patch it a bit with tar, but its wont be enough so..
tl:dr any advice/protip to fix leaky roof??
2 posts omitted. Click Reply to view.
Basil Mogglefedge - Fri, 11 Aug 2017 07:48:07 EST ID:Qvyc/LxJ No.7148 Ignore Report Quick Reply
Put a big tarpaulin over it
Jack Gimblecocke - Tue, 06 Feb 2018 00:48:17 EST ID:Gcu3ZTpB No.7165 Ignore Report Quick Reply
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tarp is easy, tin would last forever, or you could rip off the old roof, put on new plywood, cover it with roofing felt and then nail down asphalt shingles like roofers do, or you could just hire a handyman.
Jack Gomblesick - Mon, 12 Feb 2018 22:39:52 EST ID:GMWUPGcJ No.7168 Ignore Report Quick Reply
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Tear out bad wood, put in good wood.
Sophie Heggleworth - Mon, 19 Feb 2018 00:47:15 EST ID:B5sChTdx No.7178 Ignore Report Quick Reply
what kinda shit you keep in there? if outside airflow is ok then just get corrugated metal and bolt that shit to some 2x4's, job's done
Phoebe Bigglelock - Sun, 01 Apr 2018 11:37:55 EST ID:dCUgPqyh No.7186 Ignore Report Quick Reply
This is actually an easy one.
Buy nail puller.
Attempt to take roof apart.
If you find you don't know what you're doing
Hire a fucking framer before you get yourself hurt.

Geeks by Alice Greenfoot - Thu, 25 Oct 2012 12:55:33 EST ID:dKl95iv8 No.5036 Ignore Report Reply Quick Reply
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"Have fun sitting in front of a computer all day staring at a screen you silly CprEs and ChEs, leave the heavy stuff for the big boys"
Construction Engineers and Civil Engineers
32 posts and 3 images omitted. Click Reply to view.
William Bremmerfodging - Tue, 19 Sep 2017 03:58:49 EST ID:IIl/zDcN No.7154 Ignore Report Quick Reply
wow the most recent thread on /tesla/ was made in 2012. maybe we should give it a fucking icon?
Hedda Lightshit - Wed, 20 Sep 2017 18:09:21 EST ID:CIqbsWn5 No.7155 Ignore Report Quick Reply
lol :)
Jenny Sengerkit - Sun, 12 Nov 2017 09:58:24 EST ID:U0gJ/NiL No.7156 Ignore Report Quick Reply
James Farryson - Fri, 23 Mar 2018 22:41:44 EST ID:uF4LZrh/ No.7180 Ignore Report Quick Reply
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"just got my bachelors; 100k starting, any job i want, any field i want, any environment i want. enjoy being pigeon holed."

  • mechanical engineers
Caroline Wodgewod - Mon, 26 Mar 2018 18:01:03 EST ID:Y+2uaWNz No.7182 Ignore Report Quick Reply
I’m a mathematical statistician...half my shit doesn’t even involve a computer.

Offshore expansion by Nathaniel Drapperhall - Sun, 14 Dec 2014 18:42:04 EST ID:y/HQD3oY No.6594 Ignore Report Reply Quick Reply
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Let's talk Sealand and other offshore constructions.

I'm no engineering expert, which is why I'm asking you guys this. If someone were to somehow acquire an offshore structure such as an oil rig, would it be possible to expand off of it? How would this be done? At what point would support struts be needed to hold up any extra land?

Yes, I was thinking about Outer Heaven.
10 posts and 2 images omitted. Click Reply to view.
Eliza Pittville - Fri, 23 Sep 2016 09:09:13 EST ID:BKy0pcqN No.6995 Ignore Report Quick Reply
Well, Sealand is a WW2 fort, Frying Pan is a lighthouse designed after oil rigs, and Rose Island was a purpose-built structure, presumably again patterned after oil rigs.

Any micronation better be prepared to defend itself, established nations HATE micronations, and other people with the micronation bug have been known to take over established ones by force.
Basil Pedgelock - Mon, 31 Oct 2016 10:21:50 EST ID:mCRRFwWn No.7012 Ignore Report Quick Reply
Emma Dobberhetch - Wed, 14 Feb 2018 17:58:58 EST ID:Gcu3ZTpB No.7169 Ignore Report Quick Reply
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Islands can be built using plastic bottles and foam. Then you can layer dirt and organic compost on top for growing things. if you need to expand, put another layer of bottles on top of the dirt, and start your garden over again. You will need to haul wood and other supplies from mainland for building shacks. freshwater catchment, alternitive energy.
pic unrelated.
Sophie Heggleworth - Mon, 19 Feb 2018 00:43:26 EST ID:B5sChTdx No.7177 Ignore Report Quick Reply

at first i thought this was yet another nature-destroying human abomination, but then i was pleasantly surprised and intrigued by the idea.
Cedric Sollyford - Sat, 24 Mar 2018 06:01:40 EST ID:XmsT5veL No.7181 Ignore Report Quick Reply
People who roleplay their own little polities should stick well to realizing the definition of a state includes the words "monopoly of force". Without that monopoly of force, you are little more than a conquest waiting to happen.

Making humanity great again by bWolf - Thu, 15 Feb 2018 15:29:53 EST ID:h+Bh4Jf9 No.7171 Ignore Report Reply Quick Reply
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I started this thread for us to throw out ideas on human augmentation, how we as a race can be improved.
bWolf - Thu, 15 Feb 2018 15:33:22 EST ID:h+Bh4Jf9 No.7172 Ignore Report Quick Reply
what can be done from chemistry, physics, biology, biomimicry, engineering, implating nano tech. which steps would've have to take etc etc.
Sophie Heggleworth - Mon, 19 Feb 2018 00:41:42 EST ID:B5sChTdx No.7176 Ignore Report Quick Reply
gotta cure cancer
Sidney Chengerstock - Tue, 24 Apr 2018 17:03:14 EST ID:B0ruPCF5 No.7192 Ignore Report Quick Reply
Dont need to cure cancer if we're all robots

Good resources for Beginning Electrical Engineering? by Isabella Fanfoot - Wed, 19 Apr 2017 17:13:48 EST ID:kZFkh/Yo No.7119 Ignore Report Reply Quick Reply
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Hey /tesla/, Just started taking my EE Pre-Reqs and am having trouble keeping up with stuff like circuit design (ie, I have no idea how to do pic related).

I tend to learn by doing problems, so do you guys have recommendations for textbooks with circuit problems?
Samuel Cleckletun - Thu, 11 May 2017 23:08:33 EST ID:FE8bC1PI No.7123 Ignore Report Quick Reply
Samuel Fagglehood - Thu, 15 Feb 2018 16:07:28 EST ID:MRVxMXcW No.7174 Ignore Report Quick Reply
I really enjoyed a game by Zachtronics called SHENZHEN I/O.
Great place for a beginner!

Mit open course-ware, go to MIT for free!

Another MIT project is circuit lab, a great little tool to give your new found interests a playground.

Trade schools often sell books/booklets for apprenticeships that really hammer in the maths aspect.

There is also a lot to be said for the hobbyist DIY communities for arduino and raspberry pi.
Wesley Ballerware - Sun, 18 Feb 2018 13:21:08 EST ID:dmDYXkOV No.7175 Ignore Report Quick Reply
Finishing my certificate in EE. (Pre-Apprentice)

Delmar's Standard Textbook of Electricity is what we use. But basically any textbook involving is going to be the same, since electricity hasn't for hundreds of years.

Also, to solve that superposition circuit: Whoever thought using three power sources to learn superposition is a real asshole to the people who want to learn this type of stuff. You only need two to get the idea.

But in a really crappy way of explaining things because I'm really bad at this:

Basically sort out two of the VT and solve each circuit as its own, you must use Ohm's Law to solve I and VRs. You repeat this process for the other two VTs. Then you must find which way current flows on each separate circuit, it can easily be found with the VTs. After you solve the three circuits, you now put your current directions and VRs on all the resistors. From there, you can solve this problem.

I would solve this but I'm not gonna spend an hour working on three circuit superposition problem.

Civil Engineering by Angus Fuddledut - Fri, 09 Feb 2018 16:57:11 EST ID:sC8vxqle No.7166 Ignore Report Reply Quick Reply
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As is in the picture, why or what was the factors that made the construction go the loop rather than linear roadway?
Priscilla Pellywell - Sat, 10 Feb 2018 18:04:00 EST ID:ZOwxft1m No.7167 Ignore Report Quick Reply
either the height difference was too great for such a short length so they needed a more gradual angle so they stretched it out with the loop, or its for safety so people dont go rocketing from an expressway onto a slower speed street, so they slow down to execute the loop turn
Emma Dobberhetch - Wed, 14 Feb 2018 18:04:36 EST ID:Gcu3ZTpB No.7170 Ignore Report Quick Reply
yeah, I think its for trucks to trucks slow down, so they don't run over all those people standing at the bottom of the bridge. there's also room to run another roadway under there.
Samuel Fagglehood - Thu, 15 Feb 2018 15:45:09 EST ID:MRVxMXcW No.7173 Ignore Report Quick Reply
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if you look at the other side its quite clear this is the answer.

The Peace Ray and Power Switch by Fucking Dinderchot - Thu, 17 Apr 2014 16:32:33 EST ID:LNG8f7Rs No.6253 Ignore Report Reply Quick Reply
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First of all I would like you to share with me any of your ideas pertaining to particle based weapons. I do not care about efficiency.

Second: Has anyone thought about focusing whole cities worth of electricity to a single city block? What would prevent this and how destructive could it potentially be?
10 posts omitted. Click Reply to view.
Ian Pittfoot - Thu, 24 Apr 2014 01:09:32 EST ID:KULKiVdY No.6280 Ignore Report Quick Reply

Neither have you.
Shit Tillingbanks - Sat, 26 Apr 2014 00:21:13 EST ID:FMSlzPfk No.6283 Ignore Report Quick Reply
Focusing whole cities worth of electricity to a single block? Electricity isnt like light in that it can be 'focused'. You could make a machine which consumes the same amount of power as what a city would consume, but essentially you're looking at making a huge heater or fan or something which would never recieve full power because the city transmission network is equipped with protective devices to prevent exactly that from happening
Priscilla Turveyford - Wed, 30 Nov 2016 03:53:53 EST ID:wXQYwiD/ No.7022 Ignore Report Quick Reply
>Second: Has anyone thought about focusing whole cities worth of electricity to a single city block? What would prevent this and how destructive could it potentially be?
It would turn the air into plasma and melt/burn everything.
Prevention of an attack depends on the method of delivery. But I didn't propose any, I just told you what would happen.

It would probably be very fun to watch.. from afar.
Acaelus - Mon, 06 Feb 2017 19:25:51 EST ID:2e0ggO16 No.7043 Ignore Report Quick Reply
Probably more fun from up close.

But yeah how would the "power" be transfered to the block? What specifically is it transfered to?

If it is just transfered to everything equally, how high and low would the power be transfered into the atmosphere/earth.
Charlotte Blatherworth - Wed, 26 Apr 2017 18:20:59 EST ID:BbwchrDn No.7121 Ignore Report Quick Reply
x ~ -

Title 24 Energy compliance/Thermal properties of CMU by Molly Blabbleford - Thu, 15 Jun 2017 23:56:29 EST ID:ff47CWkA No.7135 Ignore Report Reply Quick Reply
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I'm trying to make constructions in trace 700 to match title 24 baseline requirments. Light/Heavy Masonry walls are giving me trouble. Its kind of a long shot to ask here but if there any Trace (or any energy modeling software) users that have done constructions for title 24 CMU's, I would appreciate a simple explanation of what you did to achieve baseline requirements for your constructions.

pick related

GD&T for Dumb-dumbs by Samuel Bepperpure - Tue, 28 Mar 2017 22:02:10 EST ID:LMSWX1C6 No.7114 Ignore Report Reply Quick Reply
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What are some of the best GD&T resources that don't make you want to shove a nail through your eyesockets?

I've got The Ultimate GD&T Pocket Guide, and it's not to bad, but still self-referential in areas, or doesn't go into enough detail on certain subjects.

I think CNCookbook has a GD&T course, and I know his stuff is usually straightforward. I'll have to check that out sometime soon.
Shit Worringdock - Thu, 30 Mar 2017 12:51:10 EST ID:IZhvBj47 No.7115 Ignore Report Quick Reply
Your mechanical engineering high school textbook(s) perhaps?
I had 4 volumes, but they are long lost.
Barnaby Gindlekag - Thu, 30 Mar 2017 14:19:18 EST ID:LMSWX1C6 No.7116 Ignore Report Quick Reply

Never went to school for it, so no textbooks to reference.

Been in the manufacturing field working with my father as a kid, since the early 00's. The thing is that the old easy to read dimensional drawings are slowly being phased out in certain industries towards pure GD&T true position messes. It pays more if you're fluent in it, but it's certainly a lot of hieroglyphs that take time to get use to. .

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