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File: foam-acoustic-panels.jpg (61 KB, 400x400) Image search: [iqdb] [SauceNao] [Google]
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I asked this to /g/ and they sent me here. I am currently making a budget studio setup. What is the best site to buy soundproofing foam panels? Like best price per piece? I assume the Chinese no-brand is just as effective since it's just foam. Or, if this is possible, is there a cheap alternative material at home improvement stores?
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>>959993
acoustic tiles are notoriously expensive, for some dumb fucking reason.

if you can get yourself some rolls of fiberglass heat insulation all you have to do is put it into frames and then put fabric or grillcloth over the outside to make it look nice.

also, some brands have foil on one side, for high frequency absorption you want the foil against the wall, but for low frequency absorption you want the foil on the outisde toward the room. you can alternate or whatever, or use the low Hz version more in the...
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>>959994
Think foam gym matts would work or too densely packed to absorb?
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File: open_cell.png (16 KB, 646x399) Image search: [iqdb] [SauceNao] [Google]
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>>959998
probably too dense, but not necessarily. it's important to understand that closed cell foam isn't acoustically valuable. you need open cell foam. if the gym mat foam is open-cell, it'll work!

>how to tell
pour water on it, if the water works its way through it's open cell! be careful not to be tricked by holes and seams though

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Not much
Medium
Get ot of house noww?
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Some more pics
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>>959877

File: wooden2.jpg (32 KB, 570x429) Image search: [iqdb] [SauceNao] [Google]
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Hello, I want to make wood toys for my 2yo son, does /diy/ know if is there any wood finish or paint i can use that is non toxic. Thanks.
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>>959431
mineral oil
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>>959431
the thing is, your son is going to bite it, it is going to happen, guaranteed, so ideally don't put anything on it
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Use chemically treated pallets.

File: 1443059030579.png (105 KB, 296x274) Image search: [iqdb] [SauceNao] [Google]
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how do I build my own 8 bit cpu using only transistors?

It's easy?
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>>958824
Start with something simple, a 4 instruction cpu that can load a register and add two numbers or something. Forget microcode, use combinational logic based on the instruction for now.
Start at a high level, define your alu, controller, memory etc. Then figure out their operation, create from logic gates then simply swap logic with the fet equivalent
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>>958834
It's there any webpage with some easy to follow instructions?
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>>958837
>build my own
>walk me through it
>>>/g/o home

File: IMG_3837.jpg (209 KB, 640x480) Image search: [iqdb] [SauceNao] [Google]
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So, my deskspace is boring as fuck. I was thinking about hanging some shelves around it to put action figures/anime statues on. I was looking at Ikea Lacks but the depth on them in around 10" and that would make them stick out pretty fucking far.

-What would be a nice layout for it with it looking cramped as fuck?

-What are some decent floating shelves that don't have a foot long depth?
17 replies and 1 images submitted. Click here to view.
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You should make some since this is /diy/.
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>>958303
I think that lay out is pretty good. I'd say go 2 12" shelves and maybe like a 43" overhead.

I'd also put the computer on the floor
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>>958303
I never made floating shelves but I can't imagine it being hard.

File: 20160307_163436.jpg (4 MB, 5312x2988) Image search: [iqdb] [SauceNao] [Google]
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I bought this from Goodwill and I'm not sure what it is supposed to be or what it is... Any ideas on what I can make it into?
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It's meant to be rock-tumbled smooth into a wooden dildo.
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>>958138
Sometimes I hate 4chan
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>Any ideas on what I can make it into?
Yeah, the trash.

File: wtfhow.png (114 KB, 2307x660) Image search: [iqdb] [SauceNao] [Google]
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pic related. I've got 5.7mm thick veneer and i don't want any edges to be visible when I glue myself a small box.

Is it possible with common tools or am I shooting myself in the foot? My intuition says that I could just file the edges so they fit 45° and 45° but I want to be sure if there's a better way or that if this method will cause me problems.
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>>957934
Define 'common tools'.
In either case, your best bet will be to make a jig and try out your method on a test piece.

Everything else depends on your skills, tools and how much time you're willing to invest.
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>>957937
Everything non-electric.
I've got files and sandpaper, clamps, hand planes etc
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That sort of cut is awfully hard to get right without a table saw.

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Is there a way to hang something heavy without making holes in the ceiling?
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Why? Looking to end it all but don't want to lose you're security deposit?
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>>957397
It's pretty cheap and easy to fill holes as long as it isn't a popcorn ceiling.
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>>957397
No.

Hanging something heavy is going to involve damaging the ceiling. Adhesives that are strong enough to hold a large weight will damage the ceiling. You're going to have to drill some holes.

I suppose you could cut through the floor above and mount some powerful magnets directly above the ceiling if you wanted a cheeky solution.

File: gas lock wtf.png (7 KB, 819x460) Image search: [iqdb] [SauceNao] [Google]
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Hey /diy/
My Girlfriend is in charge of the gas bill, and she neglected to pay it, even though i had more than enough money to cover it when she did not.
They did what they always do and turned the gas off. I repayed them but they will not come out until the 7th of march to turn the gas on.
I dont really want to live in a <50F house all week, so im going to turn it back on. However ive never seen a lock quite like this one. Im trying to open it while keeping the lock intact. I do not have bolt cutters to cut it off. Ive included me 2 years in mspaint diagram of...
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Wear an extra sweater
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Get a replacement price on the lock from them then weight up if you are willing to cut it off.

I know some contractors who are regularly faced with being given the wrong keys. They ring the customer and quote them a price per hour to sit and wait for them or given them the option of cutting it off. You can guess what normally happens.
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>>955438
Pay the bill. If you bypass the lock you are committing theft. They may decide to not restore your service at all then. They may decide to call the police and press charges. Is it worth having a criminal record over? Just pay the bill.

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Is my house going to die?
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This is the wall directly over the jpist with two registers cut into it. Note the floorboards pulling away, and the door I had to hack up to get to close. Assumed the floor was warped because the heater and furnace were down there. Next time I won't use the inspector the realtor suggests.
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>>954842
Oh wow. Gonna have to cut that hvac shit off and sister some new joists to each side.
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>>954864
Really stupid thing is, other side of that vent is just an open area under a stairway. No one would have cared if the duct was five inches back. Which is what I'm planning on doing.

Do you really think I need to sister both sides? The joist is obviously not doing what it needs to be doing, but it's not cracked and honestly looks better than most of my joists.

I wanna fix this myself, but I want to do it right. Or as rightly as I can afford.

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What is the strongest known adhesive?
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>>953044
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>>953055
that stuff is crap

File: image.jpg (4 MB, 3024x3024) Image search: [iqdb] [SauceNao] [Google]
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I tried googling but I am seriously drawing a blank here... Anyone from /diy/ know what this piece of hardware is called?
**(key for scale)
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>>958830
Some kind of hose clamp?
Looks like some scaffolding or am aerial pole mount or something but it wouldn't do much
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>>958830
Whatever lock that key goes to looks like it would be really insecure. Id guess you could open it by setting just the single pin.
Whats the key go to op?
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>>958833
I'm really not at liberty to say. But good to know! Thx

It looks like the head of the screw or bolt broke off one end. Tightening and loosening the screw expands and contracts the rings.
Nobody?

File: 1453818495756.jpg (31 KB, 436x436) Image search: [iqdb] [SauceNao] [Google]
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I am fixing some stuff on my old cheap 2005 computer my old friend assembled for me.

The power supply went out and I put a new one in for the first time. I hooked up the hard drive wires and it all worked. Does it really matter which power supply sockets I plug my hard drives into?

I bought the new power supply from best buy mostly to diagnose why my computer was randomly shutting down. My old one was 300w and the new one is 400w.

I was hoping to find a cheaper one on Newegg. Best buys was $40. I don't really know what factors into a less expensive...
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33 replies and 3 images submitted. Click here to view.
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>>958805
Also I need a new hard drive because I'm out of space. What do I look for on my motherboard to see if it supports sata?
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Not it doesn't
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>>958806
SATA connectors. If it doesn't have them you can use a PCI sata controller.

File: nas.jpg (136 KB, 900x564) Image search: [iqdb] [SauceNao] [Google]
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Hi /diy/,

How would I go about reducing hard drive vibration noise from my ghetto seedbox set-up?
34 replies and 6 images submitted. Click here to view.
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Wrap it in bubble wrap.
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>>958607
I don't want the hard drive to die from heat.
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>>958605
Insert between foam sheets, a 5 yo kid could've figured it out.

File: 3.jpg (139 KB, 692x465) Image search: [iqdb] [SauceNao] [Google]
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Currently I'm working on creating a pan tilt head to mount an antenna on, with very high resolution, for my thesis.
I found some usefull projects as reference already but I have some questions especially about gearing.

Since I'm an electrical engineer, I have no experience whatsoever with mechanical thingies. Yet I have to design an almost entirely mechanical thing.
I've already searched the net a bit, but cant quite figure out how worm gears and worms function; how their reduction ratio can be calculated for example.

I know that it's...
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>>958460
Well if you think about gears you can work out the ratio from the number of teeth, this might seem intuitive but you need to know why.
If you think about toothless wheels it's the circumference that matters, twice the circumference means twice the distance and so half the number of turns.

A single start worm has one tooth, but the tooth is wound around the entire length. The tooth is then in a different configuration because the angle of the tooth means you have to angle the gear which is why a worm has...
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Your ratio is the number of teeth in the worm wheel divided by the number of starts on the worm.

The ration you use will depend a bit on how fine of an adjustment you want to achieve, how much space you have for the parts, and how much load will be on them. If you have room for a 50mm diameter worm wheel and a 50kg load you probably want to steer toward a coarser ratio- the teeth in a 60:1 worm set will effectively be twice as thick/strong as a 120:1 set.

A smaller ration isn't automatically more precise than a higher one. But a higher ration will be more...
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>>958467
Ultimately the antenna mounted on the pan-tilt head will have to track very tiny RF chips over a fairly large distance.
The angular accuracy of the antenna (not up to me) could get as close as 0.1 degrees in theory, only if some advanced design technique actually works, else it's going to be around 2 degrees.
My aim for the resolution of the moving head is therefore around 0.1 degrees and I'm currently thinking of using a stepper motor, since servos have a limited travel, steppers can be geared down...
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