Cheap bench power supply tear-down (it's bad!) 

+bongolongoallthetime He has no idea what hes on about, hes basically seen EEVBlog do a PSU teardown, and attempted to copy him with his own commentary... Oh look, a component with an adjustment, it must be a pot. (The blue multiturn trimmers ARE pots, however the rotary encoders are definitely not) I don't think he found anything to actually complain about...rather he just wanted a sensational title for the video, and to seem like he knows what he is on about... I especially love how he didnt even check the caps, then about halfway through he realizes they might still hold a kick...Then proceeds to not discharge them STILL and continue manhandling it!

+Tyson Popynick LOL... I've been a professional electronics engineer for over 40 years -- but hey, if you say I have no idea what I'm on about then you must be right :-)

+xjet Are you really a professional electronics engineer? Or maybe just a plain engineer/hobbyist? I ask because you said in the video you did not know what a TL084 is! Really!?!? That would be like a Star Wars fan not knowing who Darth Vader is! After the uA741 op amp the TLC070/TLC080 series of op amps must be the most known and common ones! If you were 20 years old I might just believe you never saw one at uni but I really would doubt it, and would most certainly call BS for someone over 20! Maybe it was elecrical engineering and not electronics?

Judging people's competence based on their static/learned knowledge overlap to your own is not a good guide. Given the massive diversity of parts available even from the 1980's and that many people specialise in to certain fields it's entirely not unusual that a majority of part codes will be foreign to most people in the industry. It's entirely plausible that he's never been involved in a project that needed such things. The more you specialise the more stupid/lacking-of-knowledge you appear to others. +xjet probably has forgotten more than most people making comments have yet learned (and sadly I hate to say as you approach and pass 50 that becomes horribly true)

+Paul Daniels Nope. There was no "massive diversity of parts available" 40 years ago, at least not OpAmps, and the TL084 is what you would call a Jelly Bean part, common and popular world wide! It was impossible to go through college (anywhere) and not work with this TI opamp series several times, and you would find them in everything, from cheap radios to studio recording equipment, from industrial control boards to expensive reaserch laboratory equipment, everywhere! If you do not recognize a TL082 or a TL084 or a TL071 then you are NOT even an experienced electronics serviceman let alone an electronics engineer! And that's not the only clue on this video!

+one4stevo he sounds more like a total Dave wannabe

he dose sound a bit like him too

Actually ,scary he really does ..the little nuances in expression ..

Nah, I think it's just the way us Aussies and New Zealander's talk when we get a bit excited. But really, I don't think it's all as bad as he's going on about. Yeah it's got problems, but what do you expect for $60 bucks from China? As for the soldering, yeah the board probably was fixed at some point. Wouldn't be the first time an SMD component fell off a board on the flow solder machine and certainly wouldn't be the last. These issues would be picked up during visual inspection and if not, during testing and fixed before leaving the factory. They're only paid in rice so I wouldn't expect too much effort on their behalf. I think one question you should ask is "Can I make a PS with these features for under $60"? I can make a power supply, but not for under $60 with these features - repairs or not. If it's been bought of eeeebay, it's probably not a factory unit and more likely a reject that's been discarded (because it's cheaper to do that than fix), repaired by someone else and then resold. I reckon a lot of stuff from China's ebay fit the description.

+Erwin Scheringa I caught that as well... looks to be C12; it's a through hole.

+rwbishop yes C12

+Erwin Scheringa Hah! You beat me to it!!

+rwbishop You beat me as well. :¬)

+Erwin Scheringa It is soldered, but it did not flow to the top side. The whole board looks like the holes were not plated through. Which is a bit of an issue itself. I guess they were counting on their wave process to just make up for it, but didn't have the belt speed right.

Nope, two octaves too low.

@maj Blagor nama :)

Honestly, I got tired of the oohs and aaahs. Like talking to children.

wannabe eev

I thought it was just me. Most of the Aussie vids are similar to this one and EEV's, viz bloody annoying.

@@2000jago dont insult the guy, he is a kiwi

@@debeeriz don't worry about it, those Mexicans can't tell the difference between an Australian or a kiwi

+Eric William -MKme Tech It''s a double-sided board so it should be soldered OK on the other side. But R5 at 10:00 looks like it should be reworked.

+Eric William -MKme Tech A lot of bench techs will just resolder whole boards before they even begin to try to troubleshoot. Easier than trying to track down every fault. Well potentially faster at any rate. Just give it the good old once over first, you know?

Paul Frederick Yep sure do. I like taking a look and trying to find the culprit first myself. Funny enough there is a video I did on fixing a bench PSU on my channel. Good old poking and prodding found the bad joint then 1 min of soldering (well a bit longer when trying to do it on cam haha). Troubleshooting is the most frustrating fun we can ever do...

+reburne Possibly knock offs? I can guarantee you that they're knocks offs. I've never seen a Nichicon capacitor with expansion slots that look like that. I've seen plenty of cheap Chinese capacitors with that exact style expansion slot though. "take some time and tidy up the wiring , any poor solder joints and OWN the unit Make it yours" How you can suggest it is in any way reasonable for people to have to completely go through devices and repair them due to slipshod workmanship is beyond me. It should have been theirs when they paid for it! They did not buy a kit. They purchased a fully assembled product. A product with some pretty glaring defects too I might add.

+Paul Frederick Your guarantee is worthless and your assertion is unfounded.. An image search for nichicon proves you wrong .. PS expansion slots will be found on bridges not electrolytic capacitors,,

reburne You're looking at other counterfeit capacitors if they look like what is shown here. Either that or you're just fucking stupid. Take your pick. I'm OK with either explanation really. OK I'm leaning more towards the latter if I am being completely candid.

+Paul Frederick Thank you for your candid response..Your "either or" option misses the elephant in the room.. YOU WRONG ..Google image search shows many many caps with that groove pattern with ichicon branding.. Only a deluded conspiracy theorist would see them all as counterfeit.. OR an egotistical pedant grasping at straws.. Answer A or B ..your choice Your format...

reburne Nichicon is one of the greatest capacitor manufacturers on the planet so of course they get knocked off a lot. They're practically the Gucci of capacitors you moron. Rubycons are actually better though.

+BeachSandInspector Technologies I did not see any RoHS markings on that device. The solder looked a bit too shiny to me to be lead free too. Now I'm not saying any of that is a bad thing. I'm just saying is all.

+Johnny “Exacto” J Voltage = Current * Resistance. Current = Voltage / Resistance Resistance = Voltage / Current So if we have 1 volt, and 1 ohm of resistance the current will be I = 1 / 1 or 1A. If we want to limit that current to .5A, we would need to change the relationship. Current we want = 0.5A Voltage we are running at = 1V Resistance we need to achieve this = ?? 1V / ? = 0.5 1V / 2 = 0.5 Therefore, if we change the resistance to 2 Ohm we effectively limit the current. If you want to know how to use the feedback to change the current on the fly, you will want to have a look at the theory, it seems overwhelming but if you just take it one step at a time it will all work out in the end.

+pillsnotbills This one is useless to compare to anything (you will get no useful data). All comments on internet about it say it is worst one you can buy. This one put much more crap on output than any other variable SMPS on market.

Miloš Lazović Bruce wasn't kidding then. You can't expect much for $60. Still, Bruce, give it a go. I'd like to see the measuring stick of badness in action. :)

It appears so, there's two panel meters in there, one would be for the voltage, other for the amperage. They should sit right across and right in line with the outputs respectively.

Ok, thanks for the information