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Yet another rant about crappy electronic designs.
Just now I was cleaning my desk and stumbled upon some old hard drive in a caddy that I still had laying around.. I figured, let's plug it in and see whether the drive still works. And to some extent, it does! Except that every few minutes it craps out on me. And after disassembling the caddy, I think that I know why.
Just as background information, hard drives work at 12V and generally require about 10W to spin their motor. Meanwhile USB operates at 5V. So a boost converter needs to be present in the controller to step up the voltage and power the drive.
Now what's a boost converter? It's an inductor, a capacitor, a transistor and a diode in a specific arrangement (if you're interested in the design, check out https://youtube.com/watch/...), along with feedback circuitry to stabilize output voltage. Now that transistor is important.. it switches at very high frequency, and its rise and fall times create heat. In the particular transistor used in that controller, it apparently causes the transistor to operate at 65-68°C. That's quite toasty IMO, and overheating may be why the controller is so unstable. But the Chinese manufacturers thought that it's just fine and okay to be sold without heatsink or some research into transistors with better rise and fall times.
So the hard drive craps out on me and yet again it's because of certified shitdesigns. MOTHERFUCKTURERS!!!!27 -
My first try at greentext.
>Be me
>18y.o recently recruted to a university
>1 month before moving to the university
>Be alone with his computer && electronics hobbys
>My town sucks
>Go on first year student integration camp
>Yay im going to meet a lot of people like me!
>Camp near the lake, 100km from home
>Day 1/7
>Moved my stuff to a house
>I dont know anybody
>Meet 3 friends who are going to live with me
>One of them is great, i like him, he likes to code, uses mac and iphone (it suffices for his needs, he understand everybody else who thinks otherwise)
>Two of them are pro party guys / alcohol vaccums
>Fucking pricks with their boombox
>99% of students are just there to drink a FUCKING LOT
>WTF.jpg
>Day 5/7
>I had been drunk only once at the camp and i havent drunk since because of AlcoholAfterEffects®
>Have a sad moment due to me wasting my time and money here.
>Totaly wasted my time... and found nobody like me
>After that day i meet 2 programers
>I have taught them OOP
>Had a great time
>Night game!
>Bizarre student party rituals
>Use my torch i made literary 8h before the camp had started
>Torch is made from pvc pipe, 9v battery, chinesium buck converter, old led module, switch
>Find the guy with the HUGE TORCH
>Wow. Is it the 100W homemade floodlight?
>Conversation about our constructions
>Both sides were looking for a friend with similar hobbies
>Exchange the contacts
>Hopefuly meet thogether and make few projects in the future
>Present time
>Got 3 friends in one day
>But still dosent understand the huge amount of alcohol nearly everyone is drinking13 -
This Chinesium power supply looks disgusting 😷 I have no idea what shit this manufacturer put their hands into when they built this piece of garbage (that nonetheless works without blowing up, go figure) but it's all sticky 😐 I want to clean it up before putting it into a new enclosure, but I don't have an ultrasonic cleaner and don't really feel like desoldering all the components and giving it a washing. Are there any other cleaning options that are inexpensive and don't damage the components or the solder joints? Pure alcohol perhaps?
29 -
I've just found out that the Chinese can even fuck up the most basic of manufacturing processes. A goddamn fucking perfboard, why on Earth would that need good adhesive with decent mechanical strength, right?!!
Initially I was told by other electronics chaps that the adhesive under the pads melts because I'm soldering at such a high temperature (470°C). Well I thought at the time that these boards are really shitty and their adhesive is garbage, and now that I've even seen a cold pad just rip off cleanly, I guess it's confirmed. That adhesive IS fucking garbage and that temperature on the iron is really just fine.
Well, I guess that I'll just design my own PCB's then, and hope that JLCPCB isn't even more Chinesium shit. Because honestly I'm pretty fucking sick of it.4 -
What the actual fuck is this?
And you're meant to hang it on your Christmas tree?
What is wrong with people?
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