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Archived threads in /diy/ - Do It yourself - 96. page
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Hi /diy/,

This is my first post, so please forgive me for the mass amounts of autism.

I'm looking for a new couple of projects and want to give creating musical instruments. Thinking maybe a cello or guitar, something that will take time, but also be badass. Not looking for professional, just good enough for me. Also, wtf is sound/tone board? I've been doing some research and am lost.

Does anyone have any experience in building instruments? Or any plans they'd be willing to share?

Thanks /diy/
32 replies and 7 images submitted. Click here to view.
Can't really help you OP but I bought a really cheap electric body and neck online and am stoked about putting it all together. Need to install frets, enlarge a neck pocket, and drill passageways inside the body.
Im making a cigar box electric ukelele. Which aside from the neck is pretty straight forward

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Building a gravitational potential energy powered cart for a physics class.

Any advice on maximizing the distance to 9 meters or above? It would have been easy if I were aloud to use elastics, but I am not.

It also must be under one kilo, but that's manageable.

I'm planning on building one similar to the one in the attached pic.
39 replies and 5 images submitted. Click here to view.
Drop it off a 10m platform.
Flywheel. 10M of string. Reducing transmission to wheels.
The weight? should have said this before, but the all parts need to be attached to the vehicle, and a 10m platform is too tall to be added to that.

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I improved the performance of my miter saw by 83% with almost no investment of my money and a negligible amount of time.

Why haven't you?
29 replies and 10 images submitted. Click here to view.
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Though I was fortunate in that Craftsman probably foresaw people doing this, and decided to make the recess fit 1/4" MDF exactly.

You just need to glue on a piece of scrap to "cradle" the kerf on both ends. This will greatly improve the durability of the insert. Doesn't need to be perfect. You just need to know that the kerf will not completely penetrate either end of the support piece.
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Easy to batch out from one long strip of MDF. Use scraps for the kerf support.
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Though I had to take off the fence to put it on, the kerf makes it really easy to square the fence super accurately.. Just stick stuff in it then butt it up against a square.

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I have about a pound of BBs. My friend used them as weights to make a Christmas present seem heavier than it was, but it was ultimately a gag gift at my expense.

What is the most diabolical thing I can make with these BBs? I don't want to just throw them in his bed, I want to make something he has to keep and remember by it how much I love to hate him.
38 replies and 7 images submitted. Click here to view.
>diabolical thing I can make with these BBs

pour them into his toilet, it will stay there forever
I want to create something out of them, not just keep them singular.
get a good high-powered BB gun (CO2 powered). Get him drunk and get him to moon something. Fire a bunch into his ass cheeks when he's exposed.

You might get lucky with one that gets stuck under his ass skin, and will be with him for a while.

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I cast these .45 auto and 7.62x39 casings in silver but I didn't think drilling out the solid silver center would be this hard and time consuming, I'm thinking maybe I should recast it. Any ideas on how to cast it without drilling all this silver out of the center?
30 replies and 17 images submitted. Click here to view.
These are for a gift for my uncle and not going to be used in a rifle or handgun
I plan to finish the actual successful castings and polish them and put a slug back in without powder or primers for a display

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I bought a condenser microphone capsule

(if translated right). How do solder the wires to use it with a 3.5 audio jack
>pic related
http://www.vekoy.com/product_info.php?products_id=10505 link to Finnish website where i bought it
19 replies and 6 images submitted. Click here to view.
Forgot to mention that it has 1+ 1- and a ground output
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Ok, /diy/ I'm trying to make myself a tiny portable FM radio, inspired by foxhole radios, with an added generic amplifier circuit. Pic related it's the schematic.

So on the left is an inductor L1=100uH with 2 caps. A C2=22pF and a variable C1=(2-10)pF cap to keep the frequency between ~103-89 MHz. The limiting part being the 10pF variable cap available locally (the only one available).
Since I can't find a germanium diode like the 1N34 I'm settling for a silicone alternative a 1n41448.
C3's are high pass filter capacitors 0.1uF
The rest of the circuit is a generic amplifier.
The core component being a transistor I chose to use a 2N4904. Now biasing it was a bit of a challenge. So I would be glad if someone could check this part for me. R1 = 5k6 R2=1k R3=10k R4=20k.
The battery is a standard 9V battery, since I'd like to fit the whole thing in a small tin box I have laying around.
So my question is will it work?
Will the diode let the signal through? What will it's voltage be? I looked at the data sheet for the 1N4148 it's min voltage seems to be 0.68V with a pretty long antenna (175-200cm) will it be enough? With the 0.68V assumed I biased the transistor but is it correct?
16 replies and 4 images submitted. Click here to view.
A 100uH on the VHF band? How did you get such a high value? With the formula f=159/(sqrt(L*C)) [MHz, uH, pF] I`m getting between 2.8 to 3.2MHz and that is HF band.
Also the detector in your circuit is for [A]mplitude [M]odulated signals, you will only catch international stations from around the world or some strong local ones. The diode is good but only for the HF bands.
The bias for the transistor is quite high and the tranz will be wide open. 3 to 6V ratio smells like magic smoke.

Please, before you continue to the depths of despair as why it`s not working, atleast...
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Ty for the info anon I'll re check my equations...
Isn't the formula f= 1 / ( 2*3.14(sqrt(L*C)) ?
Still that's very high for AM.
You wouldn’t happen to know where I could read up on the theory from a reputable source... I'm scrapping this together form old physics books from university and most stuff I look up online isn't reputable or reliable or is very basic to the point of being useless.
1/2pi = 0.159 and your equation uses F, H and Hz.
The radio in your pic is what can be used to receive AM. It's basically a crystal set with an amplifier and both the circuit topology and the component choices suck at 100MHz FM.
You can try your luck with regenerative receivers or one-chip-does-it-all type IC receivers (TDA7000 or whatever is its current iteration). Or you can build a superhet, but it requires much more work and skill.
Usually people building radios start from simple AM receivers, but better...
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/k/ is making a religion. I can't be assed to come up with any ideas for religious clothing on my own. /fa/ is being a bunch of little bitches, so what would /diy/ suggest or submit as holy garments for the Kubist religion.

TL;DR Giant gun Kube gives reason for life through warfare. Gun is life. Life is strife.

Politics aside, what kind of garb shall we wear. Draw thread if necessary, but I'm open to whatever ya got.
>All religious people have distinct hats

Let's see what ya got

May your enemies die...
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12 replies and 2 images submitted. Click here to view.
DIY tips on how to run a religion or town would be welcome as well.
Just take your silly fucking roleplay shit elsewhere, we're not interested.

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Hey /diy/,
I am trying to build the smallest ping pong launcher robot. I thought i could use co2 canisters but i am not sure how to use it properly. Is it feasible to use co2 canisters for My objective? What do i need to use for connections and selenoid valves? How can i connect the cartridge to the system since it requires to be opened by puncturing?
Thanks alot. Any keyword or another approach is very well welcomed.
11 replies and 2 images submitted. Click here to view.
You can try a bb gun magazine. It has a built in push valve. And an easy way of installing the co2 cartridge. You would only need a way to push on the valve to release the co2
You don't know what you're doing or enough to do this safely. You'll get hurt or hurt others by pursuing this project.

C02 cartridges have a vapor pressure of 850 psi at 70 degrees. You'll need a regulator and high pressure connections.
You don't know enough.
modify the chamber of a paintball gun?

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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

also, general electronics thread
330 replies and 56 images submitted. Click here to view.
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.
> 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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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.

/diy/, how can I play electric guitar at a picnic without using a generator?
39 replies and 9 images submitted. Click here to view.
Car battery that bypasses the amps power supply and feeds 12V straight to the amp board.
How long would an average car battery last, at pretty loud volume on, say, a 20 watt amp?
Most guitar amps run split rails. A very well filtered switching converter perhaps.

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For a physics project (im in high school), i would like to build a spot welder, similar to this video.
I have little experience working with very high currents, but if i take proper safety precautions, such as wearing thick gloves, proper welding goggles, etc. would it be advisable for me to attempt to build this?
95 replies and 15 images submitted. Click here to view.
i made one, there are videos on making a jig for a spot welder. its not hard, the hardest part for me was making the coil. i got a microwave from a thrift store and removed the transformer. 10g wire from lowes was like 12$ for 50 feet.
>> inb4 underage b&
Before you waste too much time, ask your teacher first if it is allowed, safety etc.
you really only have to protect yourself from the 120V primary, coz the secondary is just a couple of volts. so, if you cover the 120V terminals with heat-shrink or tape, the rest is relatively safe, unless you nicked the primary wires, exposing the copper.
as for welding goggles, you dont need them. it shouldnt be any brighter than birthday sparklers.

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I have this old freezer in my basement. It is a built in.

My plan is to take a chainsaw to it and cut it to peices to get it out.

Safety considerations besides PPE?
47 replies and 2 images submitted. Click here to view.
>>909715You may find that the simple sawzall if a far better tool for your task...

Just sayin...
My only concern would be refrigerant gas leaking into and being confined in a small space, I don't know how you'd safely vent it out of the area.
Built-in, hows? I've never dealt with one before.

I know. I'm a plebeian.
28 replies and 6 images submitted. Click here to view.
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Chainsaw tool
this, though i wouldn't consider a 'need to know tool' when it's just a convenient multitool
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Believe it's called a "scrench"

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Hey /diy/, I moved into a place where the closest outlet to my desk is in the middle of fuckin nowhere on the wall. (pic related)

What's the best way to power my setup while still being safe? Extension cables aren't meant for permanent usage, etc.
18 replies and 3 images submitted. Click here to view.
>Extension cables aren't meant for permanent usage
thats retarded nigga

so i can plug a power bar into an extension cable and power my computer/monitor just fine?

i thought doing that like... caused house fires.
Extension cords are just fine to use.

The problem with them is people using a thin little $5 20foot long cord designed to run a single lamp or two, but plugging in three lights, a space heater, aquarium pumps and heater and seventeen strings of christmas lights.

All power cords that are listed or registered will have a load rating. Do not exceed it.

The other problem is extrnsion cords spanning traffic areas making a tripping hazard.

If this photo is your situation, I would find a cord with...
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