Archived threads in /diy/ - Do It yourself - 403. page

Why not motorcycle throttle bodies?

>>1052195

I'll have you know, I never really thought of that... Thanks for the tip

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I've been turning over the idea for a while to make a continuously variable intake for my RX-7, a-la the legendary 787B. The construction of such a thing doesn't seem all that complicated, but getting it tuned correctly would be a tricky operation.

this ancient series is still available today. they're designed for 8080 processors, so you'll have to figure out how to drive the RD and WR lines properly. but they're so old that many example builds can be found on the web.
http://www.ti.com/lit/ds/symlink/adc0804-n.pdf

Your explanation does not make much sense. To begin with, do you want an ADC, a DAC or both? Do you want to show how the ADC works internally and do you want a sample and hold before it? If not, then you usually just feed the (filtered) analog signal to the ADC and out comes the digital results. Not much to see here.

One way to achieve the stepped input followed by 8b conversion would be LF398 + ADC0800. ADC0800 even requires sample and hold to operate properly. If the ADC itself is too much a black box, you can build one from a SAR register, a DAC and a comparator.
If you want to skip the S&H, AD7820 does not need it if the input frequency is less than 7kHz. There are other options too, of course.

If you then want to convert the signal back to analog, something like DAC08 would do the job. It does not have any filters, so you'll get the stepped waveform out and can then filter it to produce the final result.

>>1052126
>http://www.ti.com/lit/ds/symlink/adc0804-n.pdf

Thanks for your answer, but I forgot to say that i'd like to keep the project in audio range. It's easier to show and to understand in my opinion.

>>1052096

>I want to turn a $13.75 Chinese AC speed controller into a variable power supply

For what? The output wouldn't be isolated so it would be kinda dangerous.

>>1052096
A capacitor

Not really sure though, but interested in why it wouldn't work/not be very optimal.

>>1052101
Worry not, I bought a bank of circuit breakers and wired up any metal casing to earth/ground so everything is mostly safe. If this is not what you meant by this statement, please clarify.

>>1051928

>>1051928
The method you posted is exactly what I used to root my wife's phone. She has issues with service randomly dropping that she had before rooting. I suspect Samsung is just shitty at stable releases.

>>1051935
Im telling you, friend, it was done fucked up.

So i said to myself - lets get rid of this shitty Touchjizz anyways.
Erased /system, all of my data was gone. Flashed a custom rom and STILL this freeze problem was there. Im too afraid of rooting it again after i got my phone back... but AdAway is life.

>>1051927
sell it to a hipster as a micro-tiny-house.

>>1051931
tini-tiny-micro-tiny house (tm)

>>1051932
>>1051931
Idk guys. I don't think I want hipsters creeping around on my property and I would like my dog stayed outside.

It's called a receiver

It's actually a pretty common instrument

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>>1051887
underrated post.


Buy a stereo receiver off of craigslist.

>>1051885
regular mixer or stereo line mixer

>>1051762
The strip at the bottom is called a toe kick plate/strip. You can get them at home depot. They are usually pretty cheap, but can be expensive if you decide to get one made out of brass or something.

>>1051766
I just did a search, and I can't find anything as a strip called a "toe kick". The corners are curved, so I can't just cut a piece of board.

>>1051771
above anon is right, toe kick/toeboard/plinth - but its basically just a bit of wood - if thats got rounded corners, its complete custom thing.

IKEA sells standard kickboards, those clip onto the cabinet feet tho. I dont know why you need to remove existing, jut recover in a new piece of vinyl, or replace with new (non-rounded edge) kickboard. Various concepts furthered here:

https://www.youtube.com/watch?v=mEDak4pT5jA

wasting that on MTG cards tho..

I'd trim some of that excess thread off, but it looks nice otherwise.

>receives lots of criticism after posting it in the correct thread
>decides that it warrants its own thread for some reason

>>1051626
congrats i guess

>>1051514
Building codes from blue states are a great place to start. Especially ones with earthquakes or high winds.

>>1051514
concrete and steel.

>>1051554
>concrete

while your question is slightly convoluted, most of the modern electric on-demand water heaters are great - small, cheap, and hot as you like. Putting one in a living room shouldnt be a problem, as long as its near the water supply?

The problem would be, have you got a sink/drainage already? If not, I'd put in a complete sink/under cupboard unit thing (IKEA-type/cheap), mount heater underneath sink, feed from/drain to your water supply. Thats about 200 EUR/$ or whatever for the sink/unit (or maybe $20-$40 second-hand), another 100 EUR/$ for the heater, and whatever the pipes and making a hole or two costs. No idea about the legality of this either, but, I doubt anyones bothered here, as long as the drain pipe connects to an actual drain, etc. Someone who knows what they are doing to connect sink to existing water be good idea.

An if I have this wrong and you have a water feed/drains and all that already (?), so much the easier. But if you only knew the old on-demand heaters, modern ones are 500% better, totally recommend, forget gas and electric boilers and shit.

>>1051472
From what i read, it takes an absolute piss load of electric to do on demand and I don't want to run a new circuit. That would take far to much work on the wall. We have absolutely zero codes in my state beyond the basics for electric hook up and sewage.

Do you mean a drain pain if it leaks? I planned on putting it a few inches above the ground and haaving a small drain pipe (with a flapper to keep the cold out) going through the wall and just pouring out in the metal building. The floor is gravel and will drain good enough. Not really concerned about a leak. I'd rather find a 12-13 amp 120 volt hot water tank.

>>1051483
Modern on-demand uses less than ever before and only use anything worth noting while water is flowing. Your mom probably does not go through that much hot water.

Heh. I was looking at doing this just the other day. The amperage is about half what you'd ideally want, which means you could burn up the power supply if you work the drill too hard so keep that in mind when you're using it. Lookup "cordless drill to corded" on youtube. There were a few vids that show how to do what you're wanting to do.

>>1051357
It might work but shitty, motors need lots of current at startup and under load. And that looks like a nice makita so dont accidentally destroy it.

Makitas are nice but those batteries weren't the best. I have 2 identical sets with 2 batteries per set and all the batteries are dead. I'll have to see about rebuilding the batteries with lion and changing the charger innards.

>>1051274
that's a diode, did you even fucking search 1n5401?

still available at fifteen americents each.

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another pic of what it came off, the other 3 seem to be fine, it must be a resistor right? but at what resistance....

>>1051277
15V power supply. Man those are hard to find!
http://m.ebay.com/itm/182034212183

>>1051215
No idea why it turned the image sideways. Sorry for being a failure.

>>1051215
Also i forgot to ask. Should i just wait through winter? Will sub zero F temperatures kill these little bastards? We get some harsh winters here.

Sub zero temps won't do shit. Even if the insects themselves die their eggs or larva will survive. Call a nursery or good landscape company and ask what kind of systemic pesticide you need to kill them since they're actual trees. Systemics are drawn up through the roots so they arent a super quick solution but they're the best bet. Also ask whoever you call about how to prune Apple/pear trees to limit limb death and the wounds it causes. It will help prevent diseases and pests.

>>1051207
I cut a piece of yoga mat/ used some duct tape and put a strip around my bedroom door as in the mornings the sunlight comes through the back sliding door and shoots down the hallway. This fixed it, but looks ugly as fuck. So idk up to you.

>>1051207
Theres multiple options at home I'm provement stores.
The "whisker" type is meh grade.
The rubber type (hollow tube basically) is better but you have to have the exact height or it will fail sooner..

Check that the door is hanging square. If it isn't fix that first. If it still needs weather strip use the staple on type or you will constantly be replacing it

>>1051183 (OP) #
When it comes to plasma speakers there are basically 2 kinds, flyback and tesla coil. Tesla coils can achieve more volume and they're more impressive, flybacks have less volume, but they can be powerful too, they are a lot simpler to make than a tesla coil.
I've only built the latter, with a 555 circuit. The key to a nice 555 flyback speaker is to use a preamplifier at pin 5, which will drasticallt increases the volume.
This is a low power one I built a while ago, the most powerful one I built is around 100W, I'm still lagging behind when it comes to tesla coils.
https://youtu.be/baPeFfeRHbM
I won't be at home until this weekend, so I can't create anything new, sorry.

>>1051198
Cool, I did the exact same thing in a college lab years ago. Didn't know about the preamp into the 555, though. Never really got much volume output, though.

My buddy once set his mattress on fire with a tesla coil.