Archived threads in /diy/ - Do It yourself - 298. page

>>1103289
If I'm understanding it right youd just wire the switches in series with each other so that one cannot work without the one before it being activated. For the voltage just wire that in parallel to the whole circuit

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>yfw OP is actually ISIS and is planning a snackbar

>>1103289
>http://www.instructables.com/id/Fireworks-Controller/

a pyro fire box (a controller for firing pyrotechnics/fireworks) does exactly what you looking for - they usually (legallly) have a key switch, thats the only expensive part - skip that? you good.

Above link is maybe bit over complex as 12 channel, just follow that and build it 1 channel - also a random first hit, maybe better, try googling 'pyro fire box schematic. or some shit for others. As other anon said tho, its all wired in a simple chain, turn on one switch to activate the next, cant go (far) rong..

Is this a subset of earthbending?

>>1103093
Apparently it's where you dick around with electronics by shorting shit, adding components, and seeing what happens.

It's beyond me exactly what this would achieve.

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>>1102992
I built this thing a year ago and am working on a new version for the Moog circuit challenge right now.

https://www.youtube.com/watch?v=tJvaH2gRwj8

I've been fucking around with VCRs a lot too. You can circuit bend video as well as sound.

>>1102956
Take a video

>>1102956
Take a video of you having sex with the dogs and leave a note with the tape in their mailbox. Thanking them for leaving their barking dogs out for you to pleasure yourself with. "Yiff yiff mother fuckers!"

>>1102956
6AM til 10PM? As in the middle of the day? Its perfectly legal for them to make as much noise as they feel like. You'll have to either suck it up and stop being a millennial or move.

>>1102077
18000000 dollars says it's a bong

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Bump

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>>1102079
you smoked through a bottle?

>>1102052
5V to 5V is 2A. Any higher voltage is less than 2A. 3V to anything else is less than 2A. 5V to anything else than 5V is less than 2A.

No experience with them per se, but they probably work as advertised.

>>1102052
Just check the datasheet...
E.g. here you lazyass: https://www.olimex.com/Products/Breadboarding/BB-PWR-3608/resources/MT3608.pdf

> Anyone here use any of these cheap Chinese step up circuits?
Yes.
They just pack ordinary chips plus all passive stuff on a PCB and try to sell that.
It's often better than what you'd design in for even twice the price.

> Can it really do 2A 5v output?
No, check the datasheet for details.

>How inefficient are they?
Check the datasheet for details. 80÷95%, depending on conditions. Chinese passive components (e.g. a cheap inductor) can decrease that.

> How hot do they get?
Check the datasheet for details. Depends on use conditions.

> Can I limit the output current to improve efficiency?
Check the datasheet for details. There's a plot, you'll see where's the peek efficiency.

>>1102368
Yes but how to limit output so device doesn't draw more than, for example, 1A?

Also could I replace the inductor with one from an atx psu or laptop charger for better efficiency?

>>1101823
The spring should have end coils to hold it in the two holders

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>>1101828
the closes thing that comes to mind in the function that im trying to achieve is a toilet paper holder, even though thats not what this is for.

>>1101842
Well then what the fuck is it for then?

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I bought this Optrel E680 and I fukken love it. Made in Switzerland. The controls for the lens are on the outside so you don't have to remove it to change settings. Also the only auto-darkening hood you can safely weld overhead with because of the rounded cover lens.

>>1101048
>What makes a helmet good? Money is no object

There arent that many real features to an auto dark helmet.
Solar panel probably being the biggest one so you dont run out of batteries when using it.

I mean they all have sensitivity and delay settings. You are paying for clarity.

I have the Jackson Balder and its one hell of a hood.
SpeedGlas is really popular, Miller makes some decent ones.

there's really not all that much to them and a lot comes down to personal preference. higher end ones will have more shade settings so you can really fine tine how dark they get.

personally i look for a decently large viewing area, shade control on the outside of the helmet and a padded headgear. the headgear itself is pretty important as that's what will usually break

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First for delta bots
finally found the time to assemble the Anycubic Kossel plus I impulse bought on 11/11
Pleasantly surprised by it's build quality considering the price.
Still need to properly level the bed/towers and am also getting slightly (~1%) over sized prints.
but considering I've only spent about an hour and 4 cubes on calibration so far I can't complain too much.
Luckily the chinks decided to ship it with some frog green PLA so the choice for the first "real" print was obvious.
The next step will be to install a heated bed so I can print all the quality filament I also bought (and spend almost as much money on as the printer itself)
The next upgrade will be the controller to a 32bit one running smoothieware and also better stepper motors (0.9°), drivers (tmc2130), and a new psu (36V motors, 24V hotend and 5/3.3V electronics)
I also plan on experimenting with a compressed air cooled hotend to get rid of the heavy heatsink and fan
Oh and it would also be nice to replace all the injection molded plastic parts in the frame with aluminium ones for better rigidity
the effector design is also rather shitty with large offsets between the mounting points of the arms, would be great to get magnetic joints with only three points of contact to eliminate backlash and tilt.
After all those upgrades I'll only need a bit of alu extrusion to build a second printer from all the parts that have been replaced.

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>>1099630
close up of pepe

anybody got tips for printing PET?

>>1105295
I wouldn't buy it, I wouldn't use it, and I wouldn't make a case for it, also, kids would buy all kinds of expensive toys, and even more expensive accessories with those toys. If you want an enclosure for it, you can use cardboard, duct tape, laser cut whatever, aluminium, or whatever you have, if you have to ask, you ain't doing it yourself. Also that thing looks rather shit, literally a overpriced hipster gift that is taking up carbon footprint for nothing.

>>1105297
Thanks for your feedback.

Kind of shitty that it doesn't come with the case and you need to buy it extra if you are a "pro" user.

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nope

I used it a few times. Works alright on wool and cotton; doesn't really soak into synthetic fibers. It'll fade after several washes. I think washing with cold water helps avoid this.

Tinting plastics doesn't work at all for me even though lots of people on the internet say it does.

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I used to tie dye shit all the time when I was a kid.

>tips

It depends what kind of dye you are using and the fabric.

Old fabric is best to use because it accepts the dye more. Lets say you are dying a white bedsheet, you will have to boil some water, throw the die in, put the lid on and let it boil for a bit.

As I said new fabric doesn't like to be dyed so make sure you are using used fabric or try to wash it several times to get it ready, you can use soap or not it doesn't matter. Just wash that shit.

Other than that it's pretty straight forward.

If you ar tie dying, don't use just rubber bands,

Get some yarn
A hypodermic needle
Plastic bags
Rubber bands
Whatever..

Take a plastic bag and attach it to the item with a rubber band, like put it over one of the ties, this prevents the dye from dying inside the plastic, then fill the hypodermic needle with a different colour and inject it into the plastic.

Substitute the rubber bands with yarn for softer colour effect.

Just experiment.

Heil Hitler.

Yes and no
I do the same thing as you I fuck it up until it's fixed but I have learned it's better to take a step back and work the problem with a brew or three then come back the next day

>>1105099
>>1105103
This. Or even you may have been fatigued when you.made the mistake anyway. You thought you could do it thatcwayvabd normally you can, you were just tired.

I almost fixed my wife's phone screen that popped out of he body. Fixed the body problem then Just fat fingered it at the last minute and it fell like a butterfly and cracked the screen pretty good.

>>1105099
That happens a lot in the beginning. Just figure out what you did to create the mistake and start on another piece. Each one you make will be better than the last. Never pour your heart into the first of anything you are making.

And, >>1105103 and >>1105117 are correct, take breaks and eat right. Once you have a few 100 hours of working on stuff you'll be able to get right into it for a far longer time without problems.

It must be under there somewhere anon, you should just keep sanding.

>>1105025
should have used wire wheel

Have you tried a pressure washer?

House lighbulbs aren't meant to run in series. You're splitting the voltage each of them gets (Kirchoff's voltage law). Incandescent bulbs are pretty much resistors, so giving them half the voltage means they'll draw half the current and appear half as bright. Incandescent, LED, etc are a bit more complicated and probably won't turn on at all.

You're not going to find a satisfactory result with series, use parallel

>>1104696
>giving them half the voltage means they'll draw half the current and appear half as bright
There a bunch of nonlinear effects that mess that up. Tungsten resistance increases as it gets hotter, so power consumption is roughly proportional to V^1.6. Blackbody radiation of an incandescent bulb shifts its spectrum to emit more light in the range human eyes are sensitive to as temperature increases. Halving the voltage would reduce usable light by roughly a factor of ten.

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>>1104641
yeah, you aren't going to find a machine design book like that.

You're going to see those rule-of-thumb designs choices by studying the equation that governs the phenomenon you're interested in. For example, by looking at the equations for a cylindrical thin-wall pressure vessel, you can see that the longitudinal stress will be half of the hoop stress.
Overall, you're going to need to learn some statics (basic mechanics of forces) and mechanics of materials (applying statics to ideal material ) to get the fundamentals first.

Who gives a shit about all that, just over-build the shit out of it and it won't break.

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>>1104546

Two plastics? Modeling glue maybe

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>>1104552
hole for the usb cable, and going by the edges would not feel secure as it would slip either in or out