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File: example_power_supply.jpg (532 KB, 1331x998) Image search: [iqdb] [SauceNao] [Google]
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I'm planning out my first bench power supply, just ordered all the parts I think I'm gonna need for this first try at it. If you have any features you would like to suggest I add, or just wanna post your own power supplies you made, please do so

Here's some rough specs for my own design

>LM317, LM337 dual supply (1.5A max on each)
>about -20 to +20 VDC
>2 ten turn pots, 5k
>2 panel mount voltage and current meters (one for above...
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Oh, and no short circuit protection. The circuitry on that is a hassle too. The LM317 and LM337 can handle have the output shorted for a little while as long as the Vin - Vout is less than 40V. So I guess I would only need some sort of protection between -V and +V

And I will be protyping on veroboard
>>
you can use the 2-diode trick to make sure the output goes to 0V instead of 1.2V minimum. also, ten-turn pots are a pain in the ass. i'd go for the more traditional 2-series pots, for coarse and fine adjustment.
>>
>>1073907
yup, definitely gonna go with this schematic. nice

I think the pots are just a personal taste, I much prefer the ten turn pot

Guys how do I wire this board to 4 18650 cells to power a hand drill? I don't get what those VL,VM,VH are for.
14 replies and 3 images submitted. Click here to view.
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>>1073351

Small education in basic googling :

USE IMAGE SEARCH.

The pic was the 4th pic for 4S-30A.

You better be sure your cells are genuine high discharge rate 18650's, or they will explode.

PS. just in case you don't know, the two parallel line symbols in there are symbols for voltage sources. In this case your batteries, the side with the longer line is the positive.
>>
>>1073385
Thanks and no these are cells I recovered from a laptop battery. I bought this board to not connect them directly to the drill so I'll be using these yeah.
>>
>>1073414

How many cells in the laptop?

If you had 8 you could simply use 4S2P with that some protection board.

File: 1476728581069.jpg (1 MB, 3264x2448) Image search: [iqdb] [SauceNao] [Google]
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Best way to put up flags in your room?

pic related.
65 replies and 13 images submitted. Click here to view.
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>>1071975
1) take flag
2) shove up ass
>>
>>1071977
=/

I'm serious, I now this is a dumb image but I like the idea of flags.
>>
>>1071975
dig holes in the floor

dig holes in the ground below foundation

put in metal poles tall enough to reach your room from the ground

weld in rings for the cords for raising the flag

acquire flags

hang them on the poles

put a fan next to it

stand under it

sing the national anthem

open the door for the neighbour

get killed

become ghost

haunt the place and make the flag wave extra hard

done

File: wall-1.jpg (3 MB, 3088x4160) Image search: [iqdb] [SauceNao] [Google]
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Removed a beam (been supporting something no longer needed), now I have a gap in the wall - whoever installed it, just cut the stucco (and partially the studs). Need to restore the wall now, but I'm puzzled with the material under the stucco (pic related). It looks and feels just like a soundboard, falls apart if pressed with just fingers, but its black.

What kind of material is this? If this helps, this part of the wall is about 8" above a single garage door, southern exposure.
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File: wall-2.jpg (2 MB, 3088x4160) Image search: [iqdb] [SauceNao] [Google]
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And another angle for context.
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>>1071759
That might be asbestos and depending on how much you handled it you may have exposed yourself to substatintial amounts of asbestos that can cause lung cancer years down the line and made the surrounding area dangerous.
>>
That's definitely asbestos. I kinda hope this is a troll post.

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I just bought nichrome wire and magnet wire online, what should i use it for when it comes in
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Shouldn't you have figured this out /before/ you bought the fucking things?
>>
>>1071150
There is nothing specifically magnetic about enamel coated wire which is why normal people call it enamel coated or simply enameled wire.
People who say magnet wire are the same type of people who say ampacity instead of current (but don't say ohmage or farenheightage or milesperhourability.)
>>
>>1071150
Nothing special with magnet wire, maybe some home made motor. But you can make a bag sealer with the nichrome, or an electric detonator, or a bottle cutter, etc.

File: Altoid_and_tin.jpg (337 KB, 2655x2490) Image search: [iqdb] [SauceNao] [Google]
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What has /diy/ done with these little shits?
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>>
semen cake mold
>>
use them as small watercolour palettes for travel purposes for the most part
>>
Sometimes I put things in them, but mostly I make stacks of them on my desk and bookshelf.

File: driveway.jpg (102 KB, 850x702) Image search: [iqdb] [SauceNao] [Google]
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Hello
I need some held with setting up lights on my driveway similar to the picture
The driveway is about 20m long and there are LED lights on one side along the way.
I want to set the lights so that they are turned on by motion.
On the house side of the driveway I plan to use a simple IR motion sensor, which is not a problem.
I have problem with the road side of the drive way. On the road side of the driveway I want to use a photocell or beam switch. (Sorry but I don't know the correct term, it is like a safety switch that you use on a sliding doors normally)
I...
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Sorry for typos (help use, not,..)
>>
sounds like you want a photo beam sensor as used by garage doors, like these: https://www.aliexpress.com/w/wholesale-photo-beam-sensor.html

as for wiring it to your PIR, we'd lot a lot more information, like schematics of the setup.
>>
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>>1075842
>>So, uh what if you attach a phone with the speaker power wires instead rigged to a small motor. then like uh, used the motor to close an electrical switch. Then like, totse use that switch to like turn on one of those dollar store electrical lighters, so you can totally light fireworks. Like I mean turn off the call sound for everything except one number, and like call that phone from, china or something?

lel incoming spoopies meme meme.

File: ibanez natural.jpg (399 KB, 1024x680) Image search: [iqdb] [SauceNao] [Google]
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I'm going to strip the paint off a guitar down to wood.

What's the best way to give a natural, non-gloss, finish to the wood?

Tru-oil?
6 replies and 1 images submitted. Click here to view.
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Clear satin lacquer.
>>
>>1075749
Tung oil on guitars is great.
Also be aware that a lot of cheap guitars look really awful when stripped
>>
>>1075758
This.

I've used BLO in the past and got a nice result, but you must realise that an oil finish will almost no knock protection, however the sustain I got with an oil finish was amazing!

File: Amps.jpg (1 MB, 1500x1875) Image search: [iqdb] [SauceNao] [Google]
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Hey /diy/

I might be moving to Australia in the nearish/mid future and I will have a way of shipping lots of heavy stuff for free like my amps in pic related.

My question is, is it likely possible or approachable to consider rewiring the transformers in the amps to run on 220V instead of their native 110V? Someone was telling me that depending on how the trans. is designed it might not be that hard.

I know I could probably get some of this stuff in Australia but it would be hard to find and really expensive and I won't have a lot of money to bring...
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>>1075698
You can buy transformers that convert 11vac to 240vac. AUS industry use them a lot if they buy overseas from the US.

They are external step up transformer units, so I would try to find replacements for the internal transformers on your equipment first though.
>>
Jaycar Electronics - www.jaycar.com.au - is the go to place in Australia for the sort of transformers you need, but check on the back of the equipment as it may already have a switchable transformer already built in.

The type shown in the pic above is an isolated stepdown transformer and will cost you between $119 and $419 (AUD) at Jaycar depending on how many watts you need.

You might find better priced transformers here - http://www.tortech.com.au/step-down-transformer-australia/isolated-step-down-transformer
>>
>>1075698

You're probably looking at around AUD300~ or so for a step down transformer for each one.

It'd be better to sell them and buy comparable equipment when you get there.

I have 10 laser pens of the same type(cheap Chinese ones) in aluminum and the threads are a bit loose, is there any way to improve the friction for the threads by applying some friction grease/paste? its for adjusting the focus of the lens so right now there is a slight wiggling room that i would like to get rid of.
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I would use Teflon tape
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>>1075577
One turn of Teflon tape might do the trick.
>>
>>1075581
>I would use Teflon tape
Also being aluminum you could out of round the body to make the threads grab a little better. I would stick with the tape.

File: spock with earth car.jpg (52 KB, 550x552) Image search: [iqdb] [SauceNao] [Google]
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If you swap the live/neutral connectors on an AC motor will it run backwards or won't it make any difference because it's AC?
9 replies and 1 images submitted. Click here to view.
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>>1075432
Since im first and dumb i will say it depends.

Some will, some wont, some fry.

Research or post motor numbers and manufacturer and shit and someone here can help. Gl.
>>
No difference.
>>
>>1075432
No difference since current will still flow in both directions. But it may be a safety issue.

File: 20161024_232721.jpg (1 MB, 2560x1536) Image search: [iqdb] [SauceNao] [Google]
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So the radio in my ae86 works but only plays on both front and rear passenger side speakers, the driver side speakers play, but they're very low volume. I know its an issue with the balance knob or internal balance circuit since it can restore the sound to the driver side when i jiggle the knob, but unfortunately i can never get it to stay in a spot where both speakers play. Since i have no idea how to diagnose or repair small electronics I took the radio to an electronics repair shop. After the technician said it'd take $220-280 to fix, I paid the diagnosis fee and...
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>>1075285
Sounds like the balance pot is shot, as you've determined. Should be simple to swap it once you figure out what the value is. Post more if you need help.

It doesn't sound like the radio part is broken at all, right? This is just audio. If you want to get into radio that's cool too, but you will probably need to get some test equipment.
>>
>>1075293
i have typical mechanics tools.
multimeter
test light
some random jumping pins

i dont have an oscilloscope though... and i know that might come in handy
>>
>>1075293
>Should be simple to swap it once you figure out what the value is

If you can find one which is the same. The only reason someone would be fixing this is if they want it OEM original.

>>1075285
>some good DIY books and articles on radio repair?

A general understanding of component level electronics would help. I've repaired a lot of them in my day but I can't think of any book...
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File: image_21074.jpg (101 KB, 1200x1200) Image search: [iqdb] [SauceNao] [Google]
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How do I mod my compressor so it doesn't wake the dead every time I use it?
18 replies and 2 images submitted. Click here to view.
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>>1075195
what type of valves does it have on the piston?
>>
>>1075195
Most are. Especially a central pneumatic.
>>
>>1075195
You can try building a soundproof box for it, but then you might have overheating issues. And it would still probably be loud.

File: s-l1600.jpg (97 KB, 1000x1000) Image search: [iqdb] [SauceNao] [Google]
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Hey /diy/.

I want to add a led flashlight to my nerf blaster, which is powered by a 2s lipo, so 7-8.4 volts.

I'm aiming for around 100 lumens.

I found a 12 volt 9 watt led which is about as bright as I want, but I need to bring the voltage up to power it.
http://www.ebay.com/itm/12V-9W-18mm-Eagle-Eye-White-Led-Light-Bulbs-Car-Tail-Backup-DRL-lights-QTY10-USA-/262502192964

This is where I'm a bit lost, I know I need a step up converter, but I'm not sure which ones will work with a LED, and work with the input range of 7-8.4 volts.
Smaller...
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>>1075187
Ah, is a LM2577 what I need?
>>
>>1075187
You want a constant current driver for the leds, since their forward voltage can vary with age,temp, etc. But those leds already have a step down constant current driver built in or maybe even just a resistor since they are so cheap. And desu, they are junk. Ive used them before and those generic chinese leds suck compared to a proper high power led. They are about 1w each max in reality. Buy a brand name led and an lm2596 with constant current will drive it happily (just set it to a reasonable current). But since you only want 100lumens buy those cheapos, and just connect them straight without a step up and they should work fine. If they dont, just open them and replace the resistor/driver they have with one suitable for your voltage.(Google led resistor calculator, you want about 100-250ma)
>>
>>1075220
Thanks for the help.
Yeah, I don't want to blind anyone with these, my current flashlight is 110 lumens and I'm happy with it.
They also are the perfect size to scew in.

My source is only 7-9 volts though, so I should just run it through any step-up before feeding it to the led to get 12v?

For replacing the existing resistor/constant current driver, wouldn't I need to know the voltage of the diode itself?
Thanks for the help.
Btw, what are some name brands for leds?

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>Put a drone on chair wheels.
>It's maneuver like a fucking silverfish and can turn 90 degrees on fly

That's how I imagine it work. But given my knowledge about mechanical stuff, this could be something taken straight from those old "troll physics" images.

/diy/, would it work? If it would, what would be the way to achieve it?
9 replies and 2 images submitted. Click here to view.
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>>1075115
>maneuver like a fucking silverfish

never thought i'd hear a comparison like that lol
>>
>>1075115
what do you mean by putting a drone on chair wheels?

do you mean one of those quad copter things with the propellers replaced with wheels, if so it wouldn't go anywhere, the wheels wouldn't touch the ground and just spin and make noise. however if you angled the electric motors so they were horizontal it would go, but i doubt it would maneuver like a silver fish (thankfully never seen one), because the change in rpm between the motors is slight so it would probably go like a bat out of hell but when...
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>>1075170

I think he means replace the actual seat part with a quadcopter and use it as an rc car

File: IMG_7181.jpg (1 MB, 3264x2448) Image search: [iqdb] [SauceNao] [Google]
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Hey there, folks.

Hoping to get a bit of advice on how to deal with this chair I just found. I'm sure a decent sanding with some fine grain sandpaper will help it out, but what would be a good, simple, way to come at it after sanding? I just want to bring it to life a bit, and protect the wood.

Thanks!
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File: IMG_7181.jpg (1 MB, 3264x2448) Image search: [iqdb] [SauceNao] [Google]
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Not sure why it posted upside down..
>>
>>1075090
https://youtu.be/7ZzTu5LgkNw?t=115
>>
>>1075091

Fuck, sorry folks..

File: pngface.png (375 KB, 1920x1080) Image search: [iqdb] [SauceNao] [Google]
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Hello guys I'm in a need to amplify 30-60 3 inch speakers they will be 5-10w. What would be the cheapest/easiest way to do it? Some sort of diy circuit or better to order something from china?
7 replies and 3 images submitted. Click here to view.
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depends on distance apart and shit (wiring complexity) - for low wattage and significant coveargage distance, I'd use 100v line system.

100v speakers just get strung together, no need for return line to amp, or bothering with impedance, etc. A factor which maybe should bother you (impedance) with 30-60 speakers otherwise.
>>
>>1075085
So you need 150-600w. Just get an amp capable of putting out that much and put the speakers in a huge series/parallel chain to get the proper impedance. Get a 100w rms *2 receiver/amp and that should be plenty of power.
>>
No electrician but,
I play with amps (budding guitarists) and I know you can fuck up your amp by not matching the ohms of all the speakers to what the amp was designed for.
And it makes a difference if you're wiring in series or parallel.
There are calculations online.

File: 20161024_171558.jpg (2 MB, 2576x1932) Image search: [iqdb] [SauceNao] [Google]
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Hello, i dont know if this its the place to ask, but i hope someone can help me out. The thing is, i found a stratocaster guitar without circuit and i buy it a new one (3 single coil, 1 5ways selector switch, 1 volume and 2 tones).

But, since i dont even play guitar, i dont even know how to wiring. I have 3 cables to weld (i guess, see pic related. 2 blacks an 1 yellow), and in the guitar i have the 2 cables coming from the jack, and one cable welded in the tremolo that splits i two at the other end.

How can i wiring this thing? I search in google, i search for...
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The yellow and one of the blacks go to the input jack (lead and ground) the other black goes under the tremolo
>>
>>1075082
Thanks mate! But which one? The one who is from the volume pot (very close to the yellow one) or the other in the left side of the pic?

And the cable coming from the tremolo? It splits in two, should be only one?
>>
The two coming from the volume pot go to the input and the other goes to the trem

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Recently moved into a new flat and used to dry my clothes on the balcony, but now that it's getting colder, that doesn't work anymore. They just take too long to get dry. A tumble dryer is not an option, there's no space. Neither is drying the clothes on a rack indoors, releases too much humidity.

Is there any way I can dry my clothes efficiently and cheaply during fall/winter?

Thanks.
27 replies and 4 images submitted. Click here to view.
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>>1075041
Goto a coin op laundry mat like all the other poor people.
If you can save 5 bucks in quarters a week then you have bigger issues than washing clothes.
>>
>>1075045
There aren't any of those in my city.
>>
When my drier crapped
I use to hang mine wet clothes on the shower rod and towel rods with clothes hangers, put a fan in there blowing on them. Leave fart fan on to vent humidity. If really humid use small space heater as well. Dry over night

Sup /diy/ friends? Let's say you want to build a safe that goes under the floor, how do you water and fire proof it at the same time?
11 replies and 1 images submitted. Click here to view.
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>>1074983
get a model that is rated for water and fire proof, usually in x minutes
>>
>>1074983

This >>1074985

But even in-floor safes won't stand up to epic flooding unless they have a drain around the perimeter. Forget about them going underwater like in a flood.

TLDR: use tupperware

Now "building" a safe... While it's possible, you are better off buying one unless you make something like I did. It's a normal drawer blank/panel (on the outside) but steel plate on the inside and one heck of a stronger glide system....
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>>1074983
safes and fireboxes are 2 different things, fireboxes are usually water proof, after all they keep smoke out too.

safes are usually made of hard metal so they are hard to break into, however metal conducts heat well and combustible things don't last long in safes when fire is around.

fireboxes are insulated and usually made of thin sheet metal and as another poster pointed out are rated for a certain amount of time in those conditions before they fail. they are easy to break into.

what do...
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Dear /diy/,
I'm making a benchtop out of concrete. I know it's going to be heavy as a brick shit house, but it fits into the design.
What are my best options for making it a little less heavy, and a little more clean?
I've been looking at diy sites using fiberglass aggregate and countertop concrete forms.
I'm considering EPS foam aggregate, paper aggregate, and watering down the cement to some awful ratio with fiber reinforcements. (I imagine I can compromise the strength-weight ratio a little bit)

If it's any better context, I'm...
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>>1074962
if you want to cheat, use normal plywood top, then lay a mesh on top, then spread some cement over it
>>
>>1074976
this
it doesnt have to be as thick as it looks like, i would probably fill the form out with some material, maybe styrofoam and pour cement over it
>>
>>1074962

why are you aiming for less heavy? you really do want a good strong mix or its going to get damaged easily.

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Hey /diy/.
Looking for any type of costume accessory I can make using standard belts. I got a bunch of old ones ranging in the 32-40 inch range. I'm thinking a modded waistbelt and a bandolier. And suggestions or helpful tutorials? Google's been worthless.
7 replies and 2 images submitted. Click here to view.
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>>1074876
Go as a belt salesman
>>
>>1074876
/thread
>>
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Well, there's an obvious answer here, but I'm afraid you might look slightly, er, Gay.

And by "slightly gay", I mean "look like a screaming bender"

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>So I bought a beautiful house, got 1.2 acres.
>In the way back I have a big pond lake.
>around that land there is 30 yards by 30 yards of land that is uneven and it looks like that the water must have at some point or sometimes have risen you can tell by the way the grass looks.
>I'm not worried about flooding at all, what my concern is building a flatter land perhaps concrete with the use of rocks all different shapes and sizes that I have around my...
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the land isnt that terrible uneven either its flat its self.
Im just wondering the steps. of making an even land, and wondering if using all the different size rocks and combinging with concrete is best.
Or actually building using water proof wood like you would see at a boat pier to put over that land as long as its above where the water rises
>>
bump for help
>>
>>1074806
>>1074807
Don't use concrete. Jesus dude. Rent a tractor with a scraper and level it out.

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Hey /diy/ ive come across this slab hidden under old grass/weeds. I am thinking it may be an old well for a sprinkler system but unsure. Can anyone guess what it might have been?

If it helps I live in South Florida
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>>1074678
a secret altar, put a copper container filled with human blood on the circle, and then have a baby killed on the concrete, the grass will start to turn white and you will see a minor demon summoned close by which can then be asked to do a favor
>>
>>1074686
Is that all available at walmart, not sure i can wait 9 months for a baby
>>
Septic tank?

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Anyone know what these critters are? I am going through my plumbing parts and I can not figure it out.

The stainless pin is spring loaded and pushes the rubber grommet thing out but I can not seem to blow through it when depressed/not depressed so it does not seem like a check valve........

Any help would be appreciated!
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Here is a rare pepe for your troubles
>>
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part of radiator thermostatic valve
>>
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>>1074661
You are awesome

Thank you!

Hello,
I have started to get into welding, and I would like to know what rig is best for under 500$ that I could produce some serious welds and make some serious art. All replies are appreciated. Picture unrelated.
7 replies and 2 images submitted. Click here to view.
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>>1074618
>serious
>art
$500 worth of car batteries
>>
Lol u have no clue bud. Use google.
>>
>>1074618
A lotos ct520 d. It's a inverter machine that can do stick and tig, as well as a plasma cutter function. Just be warned, he high freq will go out if you abuse it so be prepared to replaced the board. They are like 300 on Amazon and ar dual voltage. They also share the guts with every China inverter that looks similar so parts are cheap and they weld good.

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Real hardware mods not those fucking cooling pads or vacuum fans!
Because they are and will always be pure and utter shit!
23 replies and 5 images submitted. Click here to view.
>>
Also the mobility shall be secondary, as this is mostly for the rejuvenation of old/unused laptops.
>>
>>1074607
>>1074608
>Also the mobility shall be secondary
usb cooling pad
>>
>>1074609
Kys

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Hi
I listen to radio frequencies on this webiste:
websdr.ewi.utwente.nl:8901
in particulary the range 2-7mhz

I'd like to be able to listen to it also without an internet connection, so there are two possibilities:
-buy a radio (I don't know if there are)
-build my own

.. how can I build my own?
is it worth?
10 replies and 3 images submitted. Click here to view.
>>
>>1073878
Short wave receiver, look for DIY shortwave kits on the Internet. Ramsey electronics sells them.
>>
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>>1073897
This.

A cheap USB dongle can be had for around $20. GNU Radio is free.

See: https://en.wikipedia.org/wiki/Software-defined_radio

Pic related is the high priced end of the hobby. But either way, your antenna will be the biggest factor in receiving distant or weak signals. Check out the ARRL antenna book (pdf available).
>>
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>>1073878
Get a SDR dongle with an aerial and use a program like sdr#.

Best option for on a budget.

You should get into amateur radio though mate it's great fun.

New ham here, pic related is my rig, love it.

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Does using vinegar + baking soda really help in breaking up/clearing grease in a sewer line? It pretty much gets backed up every year (its not a root problem)
44 replies and 6 images submitted. Click here to view.
>>
>>1073858
no, but using only one at a time will do

vinegar and baking soda cancel each other out...
>>
>>1073858
>Does using vinegar + baking soda really help in breaking up/clearing grease in a sewer line?
The only thing I've found to be effective is a snake, if the line is already clogged. Pouring in any kind of drain cleaner is just making a bigger mess to deal with.

If it's not totally clogged yet, you can try using dishwashing soap. A lot of times that works for me.
1. You run the hot water for 2-3 minutes, or until the water begins to back up into the sink, about 1/3...
Comment too long. Click here to view the full text.
>>
>>1073858
stop pouring oil down your sink

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Hey I'm in the planning stages of a costume, but the costume has a metal mask I'll be casting out of either bronze or aluminium, but I wanted to put a microphone, speakers, and a push to talk button in it.
I was hoping to have a mic attached to my right ear, which would have a simple pushbutton on it to activate the microphone. I wanted to push sound through two small round speakers at the chin, and I don't mind if the speakers are a little bit tinny.
I'm wondering if anyone can point me to a place I could order parts from to keep it cheap and who...
Comment too long. Click here to view the full text.
13 replies and 4 images submitted. Click here to view.
>>
Bampin
>>
this is all stuff you can get at the dollar store, to take apart and remake. they even had an amplified mic at one time, called a spy mic. i bought a bunch of them, and they're surprisingly good if you replace the mic with one from an old phone.

if that's too cheap, you can probably find the headset from a dead Sony or Samsung phone sitting in a drawer somewhere, or from a friend.
>>
>>1073898
I was thinking more along the lines of individual electronic components...I want to actually build the circuit, not cannibalize existing stuff.


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