/diy/ - Do It Yourself

>>1788842
How do people not make the mental connection that the wire goes through the hole? I hope whoever did this burned himself repeatedly while soldering it.

>>1788882
So wires are supposed to be on the other side? But it's neater like this just components on the other side

>>1788842
eh, it could be worse. it'll probably work fine but could do with a hot glue bath on the back to secure those wires against vibrations.

>>1788842
He he

>>1788926
It does work but if one of the connections ever fails Im just not even going to bother trying to fix it
Wouldnt the hot glue damage the isolation?

>>1788939
Hotglue is fine, it doesnt get hot enough to melt the insulation

I've seen much much worse from co-ops and interns at work. You're fine, just do as >>1788926
suggested.

I am still amazed that some person can have the mental power to design pic related.

>>1788993
that one doesn't seem that bad
i've seen some shit

>>1788842
>using Circuit Boards at all

>>1788882
How do people like you not see the components that are already occupying said holes?

>>1789168
Based

>>1788993
>>1789018
>>1789168
wow thats some new level of diy autism right here

>>1789237
well >>1789168 was soldered together by hand and sold by the hundreds.
Its a radio build before PCB were a thing so the woman soldering these just added one capacitor to another.
Pic is a Kenwood amplifier.

>>1788939
Are those l298s? I recently made a motor driver circuit too and mine looks way messier than that. I also soldered the IC directly to the board.

>>1788842
I did this a couple years ago. Worked fine, but a printed circuit board would have do a much better job.
Pics are from my instagram, don't panic.

>>1789300

>>1789301
This thing represents literally the worst thing I could have possibily ahve done. This board controlls 5 DC motors from a 5 axis anthropomorphic robot (a robot arm). The output are high current (not really high power) op-amps. This thing gets a 0-5V analog output from arduino, converts to negative 1.25-possitive 1.25V, amplifies by 8 or 10, I don't remember, and outputs the motors. It did work, could do a post in /ohm/ or something.

>>1789298
yeah drives two stepper motors
I made this ages ago now I just use a4988s for that task
way easier to solder and can output much more current without getting hot

>>1789305
you used dc motors as opposed to servos for a robot arm?
how did you control them?

>>1789309
The arm was already done, but was 20 or 30 years old. It was for educational pourposes, used old hardware and software, and none of them were available. It has DC motors, but atached to the axis, it has some potentiometers, so it has really servos, but the hard way. The arduino read the output from them, previous calibration, and outputs the way I explained previously.
Kek, I controlled the arm with an old game joystick, I think I have the vid.

>>1789300
nice roll cage

n-no bully

lol amateurs

you need to tape some cardboard on it to make it look professional

>>1789347

I realize it's a religious argument but I'll but in anyway. That cold-soldering crap you have to do on those boards sucks in my opinion. Vero or strip board when used wisely is 100x easier.

>>1789354
I got those boards solely because they were the absolute cheapest on Ali.

Should have gone with the tinned ones, since some of the pads were already a bit oxidized and awful to solder on.

>>1788926
>Hot glue
Now that's disgusting, those are short solid core wires and they're not gonna move around unless the joints are poor or the wire was partially cut when stripping.
If something does fail and you have hot glue you just throw it in the trash.

t. used wire-wrapping

>>1789347
Did you use tin wire as jumpers? kek

>>1789305

>>1789431
It's tinned copper wire

>>1788842
>>1788842
are you me bro???

>>1789409
you can solder through hot glue just fine, and you dont even need to apply any 'fresh' solder.

t.experience through tomfoolery

>>1789707
Seriously? How do that work? Do you just plunge the iron through the glue or do you strip most of the glue off beforehand?

>>1789018
>j j j jam it in

>>1789707
>>1789790
Hot glue's solvent is alcohol. Just soak it around the edges and all around the hot glue 15-30 seconds and the whole gob will peel off

Never tried soldering though it

>>1788842
Looks fine to me

>>1789357
obviously you need to clean bare copper boards first before you work on them. acetone to clean oils, followed by hydrochloric acid to get the heavy oxides off

>>1789347
imagine not knowing about pogo pins

>>1788842
>>1788932
>>1788939
>>1789018
>>1789305
>>1789341
>>1789695
You deserve to get the virus

>>1788932
My God that's beautiful

>>1789790
plunge it in and dont breathe in the fumes.

>>1789707
>>1790731
Don't breathe the fumes applies double to super glue if you heat near it

>>1788842
Once had to repair some Current meters that were used in tuition.
of course someone had tried to measure Voltage with them. (Amp meter has close to zero Ω Voltage meter close to ∞Ω)

Most of the copper traces were just vaporized and i replaced them with solid 1,5mm2 copper wire.

looked way worse than pic the traces were just gone.

>>1789168
This is the electrical equivalent of scat porn.

>>1789168
How the ever living fuck does this not short out?

>>1789434
I would recognize that shitty furniture anywhere. how´s is going umabro?

>>1789237
>>1791958
>>1791969
That's how vacuum tube amplifiers and radios were made back in the days before transistors and ICs. PCBs were not common and typically everything was point to point wired. It's just how it used to be done.

>>1789347
How does this metal string called that you can solder directly into the circuit board instead of wires?

>>1792388
I think the silver colored one is just a stripped wire. The copper colored ones are probably enamel coated copper, aka magnet/coil wire

Some 26+ g wire wrap wire also as very thin insulation you can just burn through with a soldering iron to tack it into place

>>1792388
>>1792392
It's just thin tinned copper wire - also called "bus bar wire".

It's not stripped, you can get them like this in spools.

>>1792407
No it's snipped component leads. When I need to bridge wires on protoboard I just snip the leads off a resistor or diode or something and use that as a wire. It's not any special kind of wire or anything.

>>1792412
No, it isn't. I'm the one who posted that photo.

What component leg is as long as the lower wire?
No, it's not enameled.

>>1792421
Bottom looks like two resistor leads to me. The solder joint hides the junction. It is the perfect size.

>>1789434
delicia

>>1792388
around here its called silver wire
its copper wire with a thin coat of silver and comes in all kind of gauges. Perfect for making high current traces
10m spool ~2€

>>1788842

>>1793402
This is art

>>1789434
That's just a man in a suit!

>>1788842
anybody tried the video card?

https://www.youtube.com/watch?v=l7rce6IQDWs

>>1788932
Jesus Christ just design a pcb and order it from China

>>1789260
I should dig out pics of my old Altec, the wiring is quite well done.

>>1793924
I'm working on something a bit more usable.
So far the plan is 320*240 VGA with 4-bit paletted color pixels. Each word of RAM is 16-bits, so 4 pixels can fit into one word of memory.
I decided on laying the video out as 128 by 256 words of RAM, so you have some room for hardware scrolling.
Right now I'm trying to figure out how to let the computer update the 16-color palette in memory.

As a stretch goal, I'd like to figure out how to do sprites, since it takes 32k to store the whole video buffer.

>>1793963
Nope. There is nothing better than hand-drawn PCBs.

>>1788932
every day we stray further from god

>>1789018
>>1790044
>>1790711
>>1789237
There's nothing wrong with that CPU work, I'm pretty sure they do this for debugging purposes.

>>1796514
Yup, when you fuck up the schematic and it's too expensive to get it redone just for the purposes of testing, this is what happens. Check your net labels, kids.

>>1788932

>Drilled through a trace
>Patched it with wire

10/10

>>1789237

>He's never seen a wirewrap backplane

You are like little baby

watch this

>>1796702
>hey bro there's something wrong with the computer
>yeah I don't know it's crashing randomly
>no idea where the problem is, but the eggheads say it's a bad connection somewhere
>no, they don't know where, you'll have to find it yourself

>>1792234

it's just a cheapo way to do it. it's more that volume production of metal-on-substrate wasn't available on contract, so if you couldn't in-house it, then you did point-to-point. I've got an old bakelite-substrate HV supply from Rocky Flats that dates to the 50's, and that was a modified production model, so it definitely was available, it was just the cost of tooling prevented companies from doing it.

>>1796702
There were automatic wire wrapping machines, IIRC Digital used them for the backplanes of their various PDPs.

>>1793402
This is super nice.

>>1796996

>>1796996

That's true, but the earliest auto-machines were manually programmed. some hyper-wizard had to do it first. They figured out early layering and netlist routing at some point, but multi-point contact wirewrap routing is surprisingly nontrivial to get right.

and, as >>1796707 points out, there were no automatic diagnostic machines.

>>1796702

You call that wirewrapping?

>>1797126
Thank god someone invented PCBs.

>>1797126

>Most of the communications infrastructure looked like this until the 90's

Looking back at this shit is like looking back at your childhood and wondering how the fuck you survived

>>1793402
What is this, a VU meter made from a 555 timer and a shift register?

>>1797825
More likely a LM386 and a LM3914

>>1789341
no one will be bullying you when you get your 72 virgins muhammed

>>1789018
is this from a Jinju Ito manga?

>>1793924
kick ass clip

>>1793402
where wires like that

>>1799496
Do as you're told.

>>1793402
It's beautiful

what is it

>>1799902
Volume meter.
The circuit appears to be a electret microphone feeding into an op-amp acting as a low-pass filter.
The low-passed audio is then fed into a LM3915, which controls the LEDs based on the input voltage.

>>1798993
Very neat. What does it do?

>>1788993
holy shit, its also on retared striped protoboard

>>1789357
always use high grid sandpaper before soldering to remove oxidation, then you will be fine

>>1789354
stripboard is for faggots, pad-per-hole is better in every way, if you are not a dunce

>>1789707
can confirm, was sceptic, tried it, it fucking works guys

>>1790061
nail polish remover works even better, the hot glue becomes super brittle and just crumbles off.

>>1790100
clean bare copper before soldering, yes, do you mean 1200 grit sandpaper?

>>1790711
she looks like one of my favourite porn stars

>>1800258
its a shitty first project. just lights up the matrix with pre-programmed patterns. digital logic + assembly is fun

it looks okay on the top

>>1801163
and then you flip it over

>>1801164
now with poor man's epoxy

>>1793402
where can I buy little pipes like that?

>>1793924
where do you get such neat wires that bend like in the video?

>>1801163
>>1801164
>>1801166
looks neat, what the fuck is it tho

>>1801276
The image is from:
https://www.bhoite.com/sculptures/

The "0.8mm brass rods" are probably from a welding supply shop. You can also find those on Ali/ebay.

>>1801526
>brass
better get a single core copper wire, straighten it and strip it, its easier to find

>>1801678
I tried to do the same with copper but is much much harder, it conducts too much heat so as you're soldering one thing everything else starts to fall apart.

>>1802379
Interesting. I never had that problem, but I found it too hard to make perfectly straight lines. I like the idea of using brass rods and will probably give it a try for a small amp.

>>1801520
Its for a spotwelder/relay controller.
Im in the final steps of charging the battery im using to work.

Will post video if it works :^)

That many wires
Is like owning a hose
One may break
But which one you will never know's

>>1789018
Can I pretend this is what happens when you try to rip the chip off when its still warm/running ?

Reading about the posts regarding hot glue I had an autistic idea. Using a stripboard, would it be possible to bend the pins of the components making sure they make good contact with each strip and then just hot glue everything in place without soldering anything? Why would it not work?

I am pretty much a newfag with electronics having only done a couple of guitar pedals, pic related.

>>1805612
What is that? Homebrew ISA sound card?
I wonder what kind of sound chip that thing has.

>>1805619
http://www.deep-shadows.com/hax/wordpress/?page_id=364

>>1805621
Huh, neat.

>>1802522
For a second I thought the wires from your power supple were running through your calculator.

>>1805613
That's a little messy but I guess it's mostly f...uck.

>>1804725
>Why would it not work?
it'd be fine but not the most reliable if it's anything that will move a lot or be subjected to varying temperatures. but you can totally just twist/crimp stuff together and fasten it in place otherwise. like 99% of automotive electronics are just crimped or bolted down, not soldered

hers my oc. rebuilt a roomba battery for the first time, and it's pretty sketch looking. Just used some copper tape instead of soldering - figured I could at least test it out before I soldered it all together. I thought this would be way more fucking simple.

>>1805613

That's a "when you see it" pic for the books, jesus.

>>1805613
is it that the whole thing is plugged into a single receptacle ( which has an on/off switch ) or something else?

>>1789198
still would need to wrap the wire around said components' leads sticking out of the holes and put a lot more solder around the joint.

>>1805613
whats wrong with--

>>1789341
>3d printed enclosure
>deadbugged with hot glue
At least try next time.

>>1801513
He has a webiste, you could check there

>>1797124
They didn't have fault finding/fixing but they did have machines that would wire wrap automatically, I think the computer archive YouTube channel has a video of one operating.

>>1802522
Wait, so you have 7V coming out of the little power supply going to a boost converter to charge the battery? And a little fan to cool the boost converter?

>>1797140
I could be wrong, I wasn't around directly this stuff but it was wire wrapped because it was easier to take thinks apart, and I think in the early days you actually had to program via this way (early as in 50s, Could even be later). I know there was a accounting machine some company made that was all tube based that was indeed programed via wire wrapped cards.

>>1796702
i bet thats what google uses to store and process big data.

>>1797126
And this is Azure.

>>1788993
What in the fucking meth addled adhd is this

>>1796698
You'll be happy to know there are operational PAR's in busy airports with boards repaired like this.

>>1807825
>battery
>copper tape instead of soldering
nice

>>1789168
tektronix used to mount eveything on these ceramic rails, needing a special solder. no PCBs in any of the stuff from early 70s in their scopes or other stuff

>>1811917
they gave you a breakout board why are you doing it like this just draw up a pcb

>>1811928
haven't graduated to pcbs yet. too tedious and error prone and used to be expensive, too. tried it once and it took me so long i wanted to kms. so i am scarred. while this is a prototype style where i can design on the fly and make changes and correct mistakes. soul vs soulless. but eventually.

>>1812075
sorry i used the wrong browser, supposed to be this.

>>1811928
Absolutely nothing wrong with this prototyping style.

>>1812132
Can be done neatly, too.

>>1812132

>>1812135
.. but only if you are Japanese.

From http://www.elm-chan.org/works/vlp/report_e.html .

>>1811925
Not who you were replying to, but I have a thing for old Tek boat anchors. I know the nightmare that is 50+ year old ceramic runs. Pic related a 545a I resurrected.

>>1788932
Anon, No!!!

>>1797155
>>1797126
You are like a little baby

But that's not a computer, that's the distribution frame!

The computer is wire wrapped too.

And still in service.

>>1802522
>IHadNoCHoice.jpg

>>1805612
I ran across that a few weeks ago. I think my only surprise was that Tµee wasn't the one who made it. Some of his stuff from 15 years ago was really gnarly.

>>1808945
>a single receptacle
look closer

You guys are missing out on some 3018 cnc milling action.

Best 150$ i spent since i got my 3d printer.

>>1811873
thanks. I know it's pretty sketch. would it prevent the battery from working? I just wanted to test if I put it back together properly.

>>1812158
nice, me too. i patched up a 561s a few months ago, what a beaut when all the tubes are warm. love the look of the point to point on the ceramic rails but holy hell they are so difficult to trace out. thank the lord for those tek service manuals

>>1812132
>>1812135
surely at that point it's better to use a breadboard. how do you even mount packages like that on perfboard without shorting all the pins? aren't the thruholes plated?

>>1807825
i can see the corrosion coming out of one of the cells already

this is just waiting for one of the copper tapes to lift up and touch something else and have a bomb in your living room

>>1813018
I read his blog once. If there's a heatsink solder point he will solder that down to the pegboard but usually using doue sided kapton tape. You can just see it there.

>>1813050
you're right, i didn't look that close before. that probably makes soldering to the leads easier too since they won't bridge across the kapton at least

>>1813052
It was pretty interesting. He said he used a special dispenser for the wire, it was like a pencil, with the spool at the eraser end.

I just made this. I'm fucking dumb, if I measured the board first, the red leds wouldn't have had that shitty arrangement. Anyway, It's a board with led and connector for every pin of a parallel port.

>>1813336

>>1813337
Yes, it does work.

>>1813020
Batteries don't have any corrosion - They are brand new from a drill battery I ordered. But good point about the tape coming up.

Should this work as-is? The battery isn't charging in my roomba, and I'm worried the problem isn't the battery. The way they have these set up, there isn't any voltage on the pins I can test.

>>1788993
for anyone interested this is Ray Dolby's first prototype of Dolby's noise reduction system

>>1812793
can you post more of that please?

>>1815060
noise reduction is just a filter? why did they need so many parts??

>>1815060
Dolby SR is for theater quality sound.
This was a prototype, which means all the parts needed to be hand soldered. And also there was no market for any specialized ICs specific to this function.
Filtering is extremely complex. There's different filters for different parts of the audio spectrum. There's multiple channels and multiple frequency bands, and the cross-over regions between them.
This system is not "just" the noise reduction stage, but noise reduction is the main goal of the whole system. Noise generally means unwanted shit in the signal, not like...white noise.

>>1815095
meant for >>1815083

>>1789018
Looks like when I squeeze the pimples and blackheads out of the crevice in the sides of my nostrils

>>1817072

>>1817082

>>1817084
I only see 4 leds how does it show time?

>>1817110

>>1817113

>>1817082
Holy shit. I am in love!

>>1811917
what is it for?
I use mpu9250 for testing in robotics surveying systems (will use an Xsens eventually). It took forever to do temperature compensation on it and I still don't quite trust it. I got surprising static pitch/roll accuracy by bias compensating it on start up.

>>1817289

>>1788882
>being this retarded

>>1817285
This is a flight control board.

>>1812135

>>1812791
>americans-1421414605336.jpg
Euro plug.

>>1817411
guaranteed replies

>>1808945
>>1812791
the original image was taken by germans in their garden and it was meant as a joke.

>>1817086
it doesn't. i only use it to confuse poeple and make them feel stupid when they ask me for the time.

>>1817788
>implying people still don't know the creaky ancient plug in the pool meme
>getting triggered by a filename
>ignoring that the real point was that >>1805613
had bare wires pushed into an outlet socket

>>1789465
Welcher Terrorist hat das benutzt?

>>1817789

>>1817289
These line taps are not rated for tgus many drops, there are rating of signal loss on these for a reason...

>>1817290
Genuinely what most MDU boxes look like.

>>1817788
yeah I know, I'm referring to

>>1805613
What is the problem here

>>1817810
>>1818089
thanks, I wasn't sure exactly what the issue was. Isn't is fucked up that the whole thing is running off one stupid plug with an on/off switch?

My first wiring project on my guitar and the first time I used a soldering iron. There is electrical tape on the back to prevent short circuiting. Pls no bulli.
(´・ω・`)

>>1818110
Nice shielding.

>>1818110
>>1818756
yeah what he said. I wish I understood ground loops better

>>1818756
>>1820350
I just tried this using duct tape (real metal duct tape)

I dont have reliable continuity between layers. One piece is okay, but if I lay another on, its between 0 and 5k and 30M ohm

>>1820488
The adhesive is an insulator.

>>1804725
Yes i did it with some speakers

>>1797126
>he doesn't know about magnetic core memory

>>1820488
They make copper tape specifically made for this. It has conductive adhesive. Don't forget the spot just above the jack and the cover. You'll want to ground the shielding too.

>>1820639
I'm going for conductive paint instead

>>1790072
That looks extremly tidy and professionnal, no shame for you.