Hey /Diy/ First time here, anyway I have a class project where I need to demonstrate on how to do something in the class. I'm completely out of ideas. I thought about how to build a computer, but I'd rather not bring my desktop all the way up to the campus. Anyway any idea is appreciated.
>>943351 Very interesting video op but you'll probably have to be more specific. All of them have very different techniques used to build them. It would probably be easier to hit up a junkyard and make your own than to try to recreate his instruments.
for a design project me and 2 other folks are looking to make my own wearable device like fitbit, but with other sensors too (3-axis accelerometer, skin temp., ambient temp. + humidity, electrodermal activity, pulse rate, blood oximetry attachment).
I'm trying to include a bluetooth module but i'm curious how that works, does each bluetooth module come with a unique PIN that allows you to pair it with a computer?
Hey guys. So a few months back I bought a cheap USB battery which claims to be holding 2200 mah which is total bullshit cause it only charges my phone about 30% and only if I let it idle. Today I decided to open the shit and see what kind of battery is in there. To my surprise it was a laptop battery cell. No inscriptions on it though. Then I thought why don't I replace it with a cell from my old laptops battery. The cells look exactly alike except there is some information on these ones (lgcas31865 i3011008413 ij281a1s3). Anyway the cells didn't have any juice in... Comment too long. Click here to view the full text.
>>943694 >when I measured amps the multimeter went through the roof
Never do this. Your multimeter measures current by checking the voltage drop across a resistor of a few milliohms. Putting the probes directly across your battery is almost the same as shorting it which can cause overheating and explosions.
> Is there a risk for the batteries to explode in my pocket or backpack?
The LiPo and LiIon batteries used by hobbyists often have built in overcurrent... Comment too long. Click here to view the full text.
Special tools are expensive and of limited utility by nature, so I usually try to make them from common stuff before I give in.
From top to bottom:
1. Chain whip, made from a metal rule and some parts of an old chain. Its sole purpose is to flay the flesh, also to remove the sprocket from my Shimano 7 speed bike. 2. Burnishing rod made from an old worn out bastard file, with the edge ground smooth for burring my cabinet scraper. 3. Marking knife filed out of a spade bit.
>>939511 our company took on a job of reconditioning an old SCR control system for an oilrig a few years ago. really old shit. diode matrix cards, relays and everything.
we bought a small batch of metal cap lm741's they where all good and legit national components, so we ordered much more from the same supplier. like half of them failed in circuit because the offset pin did nothing, and we had issues all over. a colleague pulled the cap it, it was a smaller brandless metal op-amp with national cap stuck... Comment too long. Click here to view the full text.
So I did what I should have done originally and put this on a breadboard before trying to solder it all together, and figured out how to get rid of the high frequency oscillation. Instead of trying to fuck around with a bunch of caps for local feedback in the voltage gain stage, all I needed was one from the op amp output to the inverting input (C6). -3db fall off is right before 20 kHz, but since it's a bass amp wired to a big woofer it's unlikely I'll need nearly that high response, even. I also had some pretty heavy DC offset on the output (150 mV), but that... Comment too long. Click here to view the full text.
>>945062 >go to store >check to see if still a current product >its an old product >they will remove the tag for you >call first providing its from at least last financial year they wont give a shit. just tell them your mother sent you the shirt and it had the tag on it or some bullshit.
Hey /diy/, oldfag fa/tg/uy here and I'm thinking of build a smallish bookshelf for muh nerd-tomes.
I've got the dimensions sorted out and I'm not half bad with woodwork, but I'm not theost knowledgeable when it come to the complexities of hardwood furnishings.
My question: Would rabbeting out grooves in the walls of the bookcase with my router be the simplest/most effective way to install the shelves, or is there a better way? I have no idea how its done traditionally but that just seems like the most direct way to me. Thanks for any help/insight... Comment too long. Click here to view the full text.
I need a nanny cam for my living room, i thought about buying one of those "Smoke Detectors" since it's 400 bucks which i don't have i would like to know how i could build one myself and if there is any tutorial ?
Speccs should be: -720p Audio/Video -Motion Detection -remote wifi access -sd slot for recording
Help a brother out
Since i posted this already in /tech/ and there was the question what i would use it for
> it is for my living room... Comment too long. Click here to view the full text.
>>945052 On second thought, after rereading your desired specs it seems what you need is a wireless webcam. Put some tape over the light that comes on when it's recording, and put the receiver in your computer (one of the unseen USB ports in the back of the computer). Log into your profile (or the hidden admin profile if you're running WinDon't), get it all set up, then jump back out to the login screen. Tada! Not exactly /diy/, but I'm sure if you hang out a bit longer someone with discrete component knowhow... Comment too long. Click here to view the full text.
I want to use pic related as a cool water jug but im not sure how to go about removing the sticker. I tried scraping it off and this cheap sticker remover solution but neither worked. I know i can just sand it off but i rather not if i can help. Any advice?
The blade geometry is completely wrong. Chainsaw teeth are very aggressive. They are designed such that they actually want to pull themselves into the wood (this is also why so much as grazing a chainsaw blade will land you in the hospital for stitches at best), and if you look at the links, there are small protrusions that keep them from trying to bite too deep.
You don't want this kind of tooth for stone. Trying to use it will get you nothing but some jagged nicks in your rock and a... Comment too long. Click here to view the full text.
>>944979 No it´s not. Carving and stamping leather bases on the fact that water softens the leather and drying hardens it somewhat. Can´t do that with faux leather or with chrome tanned leathers. Only vegetable tanned leather is good for carving.
Hey is there any way i can extend my WiFi to outside my house? like a type of antenna or extender? I would like to be out in the woods with my laptop because it is really nice actually but there's no WiFi so i cant really do much.
I have a basic understanding of electricity but need some help. I am purchasing some solar cells that each have 2.8 watt, .5 volt output. What could I do to change that to 5 volt 1 amp? This is a project for making a solar powered USB charger.
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