EEVblog #1035 - Flaming DIY Power Supply!

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Название	:	EEVblog #1035 - Flaming DIY Power Supply!
Продолжительность	:	20.00
Дата публикации	:
Просмотров	:	461 rb

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Comment from : cali

i own two of those for few years now and i havent had any problems so far knock on wood
Comment from : Yuika Gauss

Soldering the SMD ceramic capacitor with too much solder create stress that cracked the fragile ceramics Lite bit of solder create hight resistance Non SMD capacitors with terminals do not suffer from that
Comment from : Octavian Constantin Tudora

Ha ha! the ceramic cap looks already cracked in half before the magic smock Look to the picture half way from the left the ceramic capacitor is cracked
Comment from : Octavian Constantin Tudora

ma senza piedini visto che la presa d'aria sta proprio "sotto" non è che è andato a fuoco perchè non circolava aria??
Comment from : Francesca Cosentino

I am from India ,Sir Nice
Comment from : Avinash Girme

I'm having an issue with a feature of the DPS5020 module, I made a power supply for it with an old 50 volt transformer The problem is that the open circuit voltage is 69 volts and this module won't latch on if the voltage is too high, do you have any suggestions?
Comment from : Andrew Popoff

Рукожоп - это диагноз Собрал такой источник полгода назад, до сих пор работает Использую для гальваники и дремеля
Comment from : orion33

At 18:09 the 44pin TQFP chip has a tin-short to the left?!
Comment from : Dancer

I think the SLY guy is correct about the burnt board Its now a carbon resistor!! had this many times
Comment from : Paul

Like Glen didn’t lift the schematics from another source
Comment from : jurassic Paulie 🦖

Ya got a booger
Comment from : jurassic Paulie 🦖

the case is nice This is a good video in electronics things go bad
Comment from : robert johnson

I own one of these A year or two ago, the tiny PCB-mounted output fuse blew while charging a 12V lead-acid battery with the power supplybrI'll have to have a look to see if mine has this faulty output capacitor design, and remove the cap before trying to replace the fusebrI'll probably replace the fuse with a large, easy to replace type, as the wee PCB fuse is VERY much not "replacement-friendly"
Comment from : Life, Take 2

Maybe I'm wrong but those things are toys that should not be exposed to more than 12 or 24 V / 10 or 5 A at the input, when I say that they are toys it is because they do not have protection against overload or short circuit
Comment from : Miguel DeMarchena

Could be/looks like from the old picture, that the C has been handsoldered That might have caused mechanical stress, which decreases the „time to smoke“ rate
Comment from : From Germany

Doesn't look like they even tested the unit before sending it out to you! They should have at least did that!
Comment from : DriverSteve

Must had been made in China! LoL!
Comment from : DriverSteve

It was a monday morning cap
Comment from : irishguy200007

You can't put the smoke back into the wires Dave
Comment from : irishguy200007

Actually the blown capacitor was C4
Comment from : WouterB76

Yes👍 🔌⚡
Comment from : ⚡IGOR KVACHUN⚡

At 18:25, does the large, brown cap, looked bowed out?
Comment from : Don Matejek

Nowadays, you would probably find the "One Hung Low" brand caps, at the Wuhan market?
Comment from : Don Matejek

Oh cool I've never seen stacked SMD capacitors like that, super funky
Comment from : Jesse

My DPS5020 don't have the caps anymore at the down of the PCB So probably there was a redesign meanwhile
Comment from : nEuDyYT

Oh my god The price is too expensive china price 240RMB
Comment from : 新东方挖掘机

I have a 150 watt supply that is great for making oopsie happen on old boards
Comment from : JAMESMANHUNT9

isn't input on that 50V maX?
Comment from : LordAnubis0909

Amazing amount of support from the supplier, I will try some RD tech products :)
Comment from : Tearstank

Regardless of the supply going up in smoke, I dont believe I would want to take credit for building that unit Some really SHI#@Y wiring skills ROIGHT !
Comment from : M06 atc

These are cheap chinese caps I've actually bought some recently - they are literally cheapest in the world and rated for 50volts Good that i've seen this video
Comment from : D

let it smoke
Comment from : god has left the building

does it have auto cut off?
Comment from : Wanttono

When you opened up the heat sink i knew they were bad at designingbrSuch a high thermal resistance there, at the wrong side of the mosfets, to put heat sink on
Comment from : Child OfGod

What ? No Explosion and nothing went BOOM ?brI want my funny money back ! 😂😂😂😂
Comment from : 3DLasers

The latest versions are ok The vulnerable cap is gone, and fan is quiet Wonderful product
Comment from : Erwin Ritter

sop check max input volts rating
Comment from : iron man

I don't know, if you threw that thing away or whatever - but you know, coal is a conductorbrAnd that's the passage your angry pixies took after the first failbrAlways remove ALL of the charring a short produced, unless you want to burn your item twice Would have been quite an easy fix and i wonder, why you didn't do itbrNot that i'm an expert in your trade, but car electric wiring has the same coal producing issues and that's why i know Leftover charring -> no fix, burning car instead
Comment from : Werner X

Oh the humanity !
Comment from : Farmer Dave

Looks like there was FOD by the Cap in the earlier photo, certainly poor soldering
Comment from : Tony Dickerson

So did we ever get a review #2 ?? hhaha
Comment from : NuKe FPV

At 14:56 and 15:07 Dave says it is set to 10 volts when it shows it is set to 18 volts, and at 15:40 and 15:48 it is showing 1798 volts on power up Are Australian volts different from USA volts like the dollars are different values between Austrialia and USA?
Comment from : Whatatay T

Hey! I saw you just showed a BK Precision variable voltage power supply I have inherited one, a 1698, and it's been running about 2 volts higher than what the display is showing I was wondering if there was a way of recalibrating the readouts, or should I be looking at the hardware for trim pots?
Comment from : pouncytaur

Only on your channel You trash every fucking thing You claim to be an engineer So far I've seen you are just a loser
Comment from : JetGyrotech

Ahh ahhh ahhh ahhh ahhh ahhhh ahhhh
Comment from : Ed B

Слишком много слов, слишком мало дела Дайте человеку ЧОП в рот! Чтоб остановить словесный понос! Всё видео можно было уложить в 3-4 минуты "ремонта"
Comment from : chveyk

може би до 100 милиампера ще се справи
Comment from : Слави Стоянов LZ1SSA

Seems your theory about Chinese cloners (no offence) who make these PSUs and buy parts in local flea market for lowest bidder, definitely is correct Happy owner of such device may or may not be lucky, because device can fail in several ways Are we must completely abandon these cheap devices? I doubt - they are good for beginners and casual DIY makers who can't afford thousands of bucks worth lab equipment However it is worth to check which seller at least does not try to push utter crap Nice DIY fix by the way
Comment from : KrotowX

after effects
Comment from : Raevod

Wouldn't the capacitance double if one of a series pair of capacitors failed short not halve?
Comment from : Nanocosm

4:51 mins into the video and you have not said one thing wow I love wasting time
Comment from : Bad Alice

"You can't kill these things" Challenge accepted :D
Comment from : chipnotic

COUNTSED!
Comment from : David Perkins

Question for CodysLab: will it charcoal?
Comment from : JanicekTrnecka

Burn marks can be conductive very good I think this is the reason why it draws current without a load connected and shuts down when the output is enabled
Comment from : djblackarrow

8:40 -> small error there; if one capacitor fails you actualy get twice the eqseries capacitance
Comment from : gorancheros

Sabotage
Comment from : Gphone Medic

Such a delight
Comment from : Digalog

great video especially thanks to the engineering advice - they are the most valuable :)
Comment from : Atetus94

Premature conflagrationbrbrI swear it never happens, but when it does, it's bHOT/b
Comment from : Noah Hastings

Made in China
Comment from : Daniel Michaud

That was fun
Comment from : Charles Goehring

I have a DP30V5A coming and its input limit is 40V Anyone know a circuit schematic to get a 40-0-40 6A transformer down to about 36V from 110 VAC? Most simple circuits (full bridge and large capacitors, no regulator) will convert that 40V transformer to 56V Too much for a DP30V5A
Comment from : Live Music Ontario

You never fail to amaze me as to the ass you are and that school-boy laugh You are an idiot
Comment from : James Hauser

I worked at a power supply company for 25 years - unregulated, linear, and switchmode I started as a technician and plodded my way through engineering and management Switch mode supplies are lightweight and compact BUT when something goes wrong you do get copious smoke and usually a little flame to go with itbrbrbrThe engineering has to be just right and the parts quality has to be very good or they fill fail spectacularly I have 4 power supplies on my workbench and everyone of them is a 40 year old linear supply made by old line companies These can be had on ebay for very little money but it does cost a bit to ship these old boat anchors (a one KW supply will weigh more than 40 pounds) Replace the bulk caps and they go forever
Comment from : dell177

There is a splash of solder shorting 2 legs on one of microprocessors You miss it
Comment from : Mariusz Kwasniewski

Hi Dave,brI recently saw a rather new Power Supply made by RuiDeng- the RD6006, would you mind take a look at it? :)
Comment from : Mike99561

Man If I had a 1000 USD for every time he says "a sick puppy"
Comment from : Neptune Vibe

If the specs say input 50V why do you set it to 55V?
Comment from : 1959Berre

0:46 I'm so happy in my country we don't use those stupid garbages And nobody dies in fire Useless You should let the glove all the time You smoke some crack and the crap is starting beliving is an open fire
Comment from : Neptune Vibe

hy i have the 5015 and all the power transistors are shorted afte 1 month of use why this happen it blew on pushing the on button with no load on output
Comment from : gigiboxa

at 18:10 in the video, you can see a short on the 48 pin leaded chip below the screwdriver in the corner of the chip Looks like a fine piece of stray wire shorting out two pins!
Comment from : Steve Dick

Mine just came in the mail today and I'm glad to say that they've improved their soldering skills and the pads for the defective capacitor are currently unpopulated, it looks as though they listened to your advice
Comment from : LazyH-Online

I'm going to add an arduino to my smoke alarm to make it a smart smoke alarm that i could turn it off whenever i build electronics or do chemical experiments XD
Comment from : Lego Mini Movie Productions

Only thing I was sure Dave had ever built was a HV probe handle for an oscilloscope
Comment from : Rýán Túçk

UNLIMITED POWAAAAA
Comment from : Craig Diaz

My electrical engineering prof's line wasbr"When you see smoke in the electrical lab your are just getting started When you see smoke in the electronics lab you are just finishing"
Comment from : Tee Cee

smoked transformers are very stinky Well the ones in HID light ballast They are dipped in something so when it goes PU
Comment from : legion2k

I notice at 15:39 the cooling fan over the mosfets is not on, thus no cooling If they don't have thermal protection when active cooling fails, that little heatsink has no chance and; that could explain the smell and the thermal runaway / aka resistance and heat and fire?? no?
Comment from : Ben

Virtually all of my Hung So Lo MLC and plate caps bleed through at around 50V You certainly need a seperate test for that component
Comment from : GnuReligion

Hi Dave could you please do a review of the Hako FX 951 I am curious to see what you think of it
Comment from : Don Hiscock

It could be a design issue also I suspect the capacitor is there to filter some high frequency noise and noise spikes caused the capacitor to breakdown and start a short The capacitor might be rated only to the max DC voltage
Comment from : ThinkingBetter