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Archived threads in /diy/ - Do It yourself - 245. page
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File: download.jpg (10 KB, 196x257) Image search: [iqdb] [SauceNao] [Google]
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So, I got really curious with Nikola Tesla's ideas of making the world a better place by building towers that could use "cosmic" energy and somehow transmit it to people for free. Then came Thomas Moray years later looking into Tesla's work and made his own device that worked and was verified by eye witness engineers and Congressman. My question is where would I start to experiment/Diy at home to expire these things for myself. Any schematics and details would be much appreciated for an Electrical engineer hopeful.
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> an Electrical engineer hopeful
You've clearly failed highschool physics.
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>>912127
>transmit it to people for free.
It still costs to generate this power so I doubt it would be free to the consumer. Not to mention the infrastructure.
>>
>>912127
From what I've read Tesla was basically tinkering along the likes of solar power. It's just that it all sounds weird and mystique when you read about it in the words and terminology of his time.
So buy a solar panel and there you have a free radiant energy to experiment with at home.

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Thinking about buying a pressure washer. My question is how much PSI is enough to get dried paint off of brick/concrete/asphalt?
13 replies and 5 images submitted. Click here to view.
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Well, depends on some factors

Wich Ground material?
Wich Paint?
Fres or old paint?
Damaged or perfectly fine paint?


without that its hard to tell, but 2030 psi (140 Bar) would do a nice job to most things.

The way you apply this force counts too.

So if you got a washer tip wich squirls, it puts the force in an angle on the Material, wich increases Effect.
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>>911739
Like2000-2400. Paint off asphalt sucks usually you end up just tearing the asphalt up and blowing the top layer away.-- removed USA markings for a year with a pressure washer
>>
Check out spinner tips for your pressure washer too. Usually you can use a lower psi more effectively and less risk of damaging the surface of what you're blowing off

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Ham thread? Ham thread.

KD9B** here, where my hams at?

Also, have to move in a couple months. I'll finally have a place with a yard. I'll finally have room to do some HF work. I'm thinking either a Kenwood TS-2000 or an ICOM IC-7100. Sure, a few tradeoffs between the two, but any opinions from those who have used both?
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-. .- .... --..-- / .. / . -. -.. . -.. / ..- .--. / . -. .--- --- -.-- .. -. --. / ... . -..-
>>
>>905054
>. / . -. -.. . -.. / ..- .--. / . -. .--- --- -.-- .. -. --. / ... . -..-
Buy the Kenwood!
73 de YO5***
>>
>>905249
Just bought a baofeng and the study manual.

I have yet to hear anybody on the airwaves.

Location Nova Scotia. Send help

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who generally electronics here?

>I'm new to electronics, where do I get started?
There are several good books and YouTube channels that are commonly recommended for beginners and those wanting to learn more, many with advanced techniques. The best way to get involved in electronics is just to make stuff. Don't be afraid to get your hands dirty.

>Links to get started
http://pastebin.com/9UgLjyND

also, general electronics thread
255 replies and 56 images submitted. Click here to view.
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>>909883
I have a question.

I want to connect a single 3.5 wire from the computer and have it split into speakers and headphones. I want to have two switches connected to the ground of each (Headphones/Speakers) so that I can choose which one gets any sound. Would that work?
Will the headphones stay silent with R and L connected but GND being opened at the switch? I can whip up a diagram if the description above is confusing.
>>
>>910040
> Will the headphones stay silent with R and L connected but GND being opened at the switch?
No. You need to use a double-pole switch to switch both the R and L wires.

Also, you really should be connecting speakers and headphones to different jacks. Active speakers (powered, with a built-in amplifier) should be connected to the line-out jack, headphones to a headphone jack.

A headphone jack may have too high a voltage for something expecting a line-level signal, which will...
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>>910048
Ok, I will look into double-pole switches.

The reason I'm doing this is because at the moment I change between headphones and speakers (Amp with speakers attached to them) by changing what is plugged into the Audio/USB extension that used to be in the front panel.
Works fine for me, but I would rather reduce the number of lose cables and switch between the two with a flick.

Like this
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>>901871
prolly works great,,,, in Seattle
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>>901871
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I am going to find a way of growing spirulina and feed it to homeless people, help me. My research starts now, everything usefull I will post here.
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Buttermilk is great nutrients
>>
If you are going to process it at all for them, be sure to add some b12 and vitamin d.

I suggest also giving them milk, cheese or yogurt (cheese keeps the best)

Additionally they need omega fatty acids which is really only available in oils, so add in some olive, soybean, or fish oil
>>
You are going to fuck up their livers op, I promise you don't have the equipment required to ensure you don't get any algal bloom

It's not as simple as letting water and spirulina sit in a vat and you get infinite supply, too much nutrients you get an algal bloom, too little you get acidic water which causes other shit

And if you do just the right amount and you get decent growth, if you remove too much you get an algal bloom and too little you get algal bloom

It is very difficult to maintain

My company used to use it for feed for fish,...
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Hi /diy/ show me what you build for no fucking reason at all.
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>>912284
Fucking commie robots coming over and stealing our spare parts. Trump was right all along!
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>>912284
speakers for eyes
You got me OP
this is what I did today
model for uni project which is a modular pre fabricated house
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>>912300
>no fucking reason at all
>uni project

pick one

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First time poster
Never lurked

My girlfriend is weird and told me not to get her anything for Christmas even though she snapchatted me a picture of the wrapped presents she apparently got me. I wanted to make her something special because I'm poor and can't afford Sephora or anything like that.

>she collects garden gnomes
>her favorite animal is an owl
Should I sculpt an owlgnome out of clay or make an owlgnome plushie? How do I into crafts?
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>>914812
check sticky
>>
Maybe you l should draw her a picture of an owl or get her a poster of one.. Don't do anything with gnomes that's just weird
>>
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>>914845
This could be good. Potato pic related my wife (gf at the time) drew me this for my bday and now it's hanging in our home. I think it's dope.

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Hello /diy/. Not sure if this is against the rules or not, but this post is not about making stuff.

Lately, I started to feel really lonely, and realised that all my ex-gfs bored me because they were not interested in doing shit. Just buying stuff, watching tv and stuff. Not that I want a woodworker girl or something, but someone that can see value in creating something, you know.

So, what do you think on the subject? Do you have a nice girl that do stuff too? You think I'm being too stupid?

If this should be deleted, I will, no problem.
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>>913973
You are being too stupid.

Women are not creators by nature, they are consumers. "Ayy gurl, wanna weld with me" will never work.

Just pick the generic vapid whore and be done with it, "the perfect girl" does not exist in the real world.
>>
>>913978

It's not about a perfect girl. It's just one that I will not get bored in some months.
>>
>>913981
Well then you either lack sufficent funds or a large enough dick to keep her interested past the phase where just smooth talking works.

Your quest is hopeless. Just keep changing women.

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if i have a wire of (x) length coiled into (y) number of wraps, i'll have an impedance (z)

if i add a second identical wire of (x) length and parallel coil the two wires into (y) number of wraps, i'll have an impedance (0.5z)?

now if i cut the length of the wires to (0.5x) and parallel coil the two wires into (y) number of wraps, i'll have an impedance (0.25z)?
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>>913728
Yes
>>
>>913739

thank you
>>
>>913728
>>913739
no

19 replies and 1 images submitted. Click here to view.
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Can you legally ship potassium nitrate in Europe?
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>>913240
yes its usd for curing meat and stuff its not dangerous on its own and blackpowder is hardly tnt or c4
the rules about actually making fuel will fuck you though.
>>
https://en.wikipedia.org/wiki/Tsiolkovsky_rocket_equation

Any questions?

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I spent yesterday assembling my parallel-vertical ebb and flow rig.

Here's what I learned:

-The fill/drain port should be as close to the bottom as possible, so that a slight inclination will allow the tube to drain completely while making it possible for the water level on the high side to get... well, almost a high as right next to the fill port.
-If your setup involves multiple horizontal tubes and a single vertical fill line, then you need valves on each of them (except the topmost) to restrict flow, or else the bottom tubes will overflow.
-The overflow...
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14 replies and 1 images submitted. Click here to view.
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Instructions unclear, bleeding profusely.

Seriously though, do you have more detail about this, it looks interesting.
>>
>>913201
It's just a box full of water, a pump and a timer to fill the pipes every 12 minutes or so
>>
Tomatoes get very big quickly, same with their roots. You're going to need some support.

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Check out this Surface Pro 3/4 leather sleeve case I made :)


Here is the video of the making process:
https://www.youtube.com/watch?v=GCFNj-0IkjI
18 replies and 1 images submitted. Click here to view.
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>>911207
How's your sleep apnea?
>>
>>911207
>>911332
great
>>
Quick question: I have waterproofing she wax that I used to my boots, worked great. Can I use the same wax for my recently purchased leather mitts (Hestra)? Should work fine right?

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Be honest, how often is your workbench ever clean like this?
87 replies and 29 images submitted. Click here to view.
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>>910865
Workbench too full.
Oscilloscope, drill stand, multimeter and a few random tools resting on my night stand along with misc. components and a shitty PSU that I built a few years ago.

Sine wave generator and Lab PSU are on top of a closet.
Breadboard with a PWM controller is on my computer desk chair along with my netbook.
I'm in bed with my laptop because I've got no room elsewhere, unless I move stuff to the bed.

pls give me more space
>>
>>910867
why don't you.... do it yourself
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>>910865
Once. When I first put it together (Ok, in reality, not even then).

File: image.jpg (133 KB, 800x1459) Image search: [iqdb] [SauceNao] [Google]
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They are just a meme, right?

Is there any real advantage?
202 replies and 29 images submitted. Click here to view.
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Have you tried using them? They are so much nicer in that they are nearly impossible to strip, and easy to turn.
>>
>>903042
Pretty much this
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>>903042
Literally no benefit compared to Allen
>>903034

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