Ah, ok, interesting, thanks.

Still not high enough for LED luminaires.

@Dave Micolichek Obviously not, this would be for testing said motor controllers and the like.

Exactly and since ebikes are popular, batteries for ebikes become cheap so we can use them for projects. We built a remote operated vehicle that runs on a 48v ebike battery at work.

@@nikkicarlson8511 And battery packs are relatively easy to build with 18650 batteries and BMS

AND you need a Dam to power the power station that powers the power supply that powers the power supply. Don't worry, there will be enough left for your light bulb and hot plate. Your power meter may saw a slot through your house, though. ;-)

If you really need a basic power supply you could jury rig a enclosed circuit board that plugs into the wall goes into a full wave rectifier and a couple filter caps. Probably those caps need to be rated 220v and I guess everything would be going through the rectifier. So you need a beefy rectifier. Max 1500 w from the wall ?

@@averysbragbook And how do you isolate the mains supply from the end circuit?

@@mervynjack4108 Good point. Make a 1:1 transformer might be the solution

Me too. I was thinking it was such good value until i realised it was a regulator without a switch mode mains supply. Price is just ok

Rectifying mains voltage is super cheap.

if you dont need 60v, just get a 50v server power supply. for 100€ you get 3kw 60a easy

I get free mains transformers from work. No worries there. Besides, the manual says "DC power supply", fair enough.

@@kwhp1507 and will blow up the converter and make the output live

Jeah, he didnt notice its "I=xA" too, just like with U = xV. Shoudl it be Amps=3Amps? :D

I was under the impression the anglo sphere does not use U to designate voltage variables, but V? (which woul dbe confusing because the unit is also V, but hey, that's what it seemed to me so far)

You are right, it does seem like he messed that up, however, next to where he pointed it says CV CC, so that should be CU CC.

I see this comment and a few reply's to others on my end. Thanks for the video. always enjoy the content.!

Nope, I see this loud and clear.

Test 1, 2

No, can't see that! 😂😂

KZfaq knows what’s best for us

There isn't a great deal you can do about all the junk that the neighbours have plugged in, but if you're doing anything with audio, including radio, the better bet is have a decent linear supply. Linear supplies are generally larger, heavier, far less efficient, more expensive to buy and more expensive to post. You're not paying this price for nothing though - All these characteristics are the price you pay for very low noise output. I have pulled the supplies out of my monitors and replaced them with a linear regulator setting the reference for a series pass transistor stage on a sheet of 1/4inch thick aluminium. It runs screaming hot, but it adds nothing to the noise floor from audio up to 440Mhz (my playground). It IS possible to get SMPS that are very very low noise, and when I'm rich and famous, I'll go to the effort of stress testing a few. Until then, I dump money, in the form of heat, into reliable and low noise linear tech.

@David Daivdson I am genuinely surprised that the national regulators tolerate it. The place it is most noticeable is HF (3 - 30MHz). Yes, for amateurs it is really really annoying, but they're not the only group of people affected by this. The military of any developed nation still uses HF for long range communications that can operate "off grid". No repeaters, no satellites, no phone lines. I can't believe that in an age where police are empowered to kick down doors over mean tweets, they allow critical infrastructure to be jammed by joke electronics.

@@digitalradiohacker I suspect that the benefit of higher power supply efficiency outweighs the higher noise floor for ham operators. Very few people use ham radios anymore anyway, at least here in the UK.

Yep, I moved to the countryside for the same reason.

This has been a problem for a long time now, but the only thing that you can do about it is drive out to a mountain top that is at least 3 miles from any civilization, then set up your HF radio gear and then drive your car a 1/4 mile away from your radio antenna or remove the battery cable so that the ECU computer shuts down all the way. Unless you have an old vehicle, pre computer era or at least OBD 1 not 2 let's face it there's more switched mode power supply's out there than you can ever imagine, all new appliances, refrigerators, washers and dryers, stoves, and then there is lights it got really bad at night because of CFL lamps (compact fluorescent lamps). But fortunately those are going away slowly, and bring replaced by LED's which still produce some noise, but not nearly as much as the CFL lamps do. The CFL lamps are bad because of the high voltage required to ionize the gas in the lamp. But TV'S and computers are horrible offenders as they have both a switching power supply, and extremely fast processors. But in addition to those there's little things like chargers for Electric razors, and Electric toothbrushes, and then medical devices such as CPAP machines, there are 2 of those in my house, and they both have those inline power brick power supply's like a laptop computer, and they're all generating noise some a little some a lot. Strangely enough one of the worst offenders I have ever come across is one of those little switcher buck converters that plugs into the cigarette lighter or auxiliary power jack in your car, and it was a really nice one triple output 4.6 amp unit. I didn't realize it was the problem at first but I was sometimes having trouble receiving my favorite Christan radio station, and not AM but FM, and a local station at that. And it seemed to be random, it would be there and then suddenly disappear. Well one day I had gone somewhere a short distance from home, I was not in my truck but a few minutes, and when I went to get out, for some reason I unplugged my phone before turning off the truck radio and most of the interference instantly disappeared so I pulled that buck conver out of the auxiliary power jack, and all the interference instantly disappeared, and I had a full quieting signal. So yes some of those things are noisy all the way up into at least the VHF band's and maybe even further. One of these days I will have a look at it with a spectrum analyzer, and just see where all it is visibly trashing the spectrum.

Nope, that's an IRF something meaning that it's more likely to be a MOSFET. However, they might be measuring temperature using that one. A bit overkill and unnecessary but who knows, Chinese wisdom maybe?

top quality, only the best.

Best element on Isaac Newton table, stuper strong, many reliable

Lol 😂 😂

Thanks

That works much better with AC sources since it won't corrode the wire so much.

@@userPrehistoricman coated wires dont give a shit about water, ac or dc 😜

U're right. But where is he going to get

Thought so

Ah! This must be it! I was puzzling over how the hell they could make a quick and easily-automatable scrubbing method that would end up looking like that.

They probably use a galvo steered beam from something like a fiber laser. Set up a fixture to register the board, program the size and location of the chips and fire away.Beats getting out a dremel.

It is lasered off. Seems to be a small pulsed qswitched (most likely about 10-100ns) high rep rate laser.

Pew pew pew

Why would they even do that?

1. To put off competitive Chinese that want to steal the design. 2. So you can’t fix it.

Yes, that is laser engraving. There are many reasons to obscure the components. The devices are not designed to be serviced, so there is not a huge impact for consumers.

They look fake with that black blob.

I use my dps5015 (50V at 15A) Power by my old arc welder transformer and a smaller transformer to drop the primary voltage to the main transformer. But the transformer from the welder has no built in magnetic shunt, so baisicly a normal transformer just a huge ~1500W one.

Yeah, it'd be great to use the ready supply of AC at these power levels. You're not going to find an old laptop/pc power supply putting out 2kW. Maybe rip the transformer out of a microwave, but then you're getting sketchy as. For a "lab" power supply I'd rather something that's reliable, linear and self-contained. But I rarely need >100W

@@MrSnoots you probably dont want to do this. those transformers are designed to be "lossy" and you have to hack in somehow a new secondary. finding a transformer which does 2KW can be a tricky task. but im still not fully convinced that it can handle the 2 kW anyway. maybe more 2 chinese kW

@Robert Slackware bur rewind the secondarys or you will get a "very shocking" experience. But still they are only in the 500W range.

@@lukahierl9857 Shocking indeed! More like a shocking and skin-burning experience.

Yep, i saw that too

They work good! Heathkit now MFJ has been making 50ohm transmitter load for years. These units are set in oil.

halogen globes work well for plain ol DC

Those exact words kept running through my mind, every time I seen it!

Maybe Junket

That's what I thought it said when I first looked at them!

no u

It turnes your tech to junk when IT crashes

Deep cycle batteries would do the job quite well enough...

But not with high frequency start!

IRFP4110PBF MOSFETs used in these DC/DCs are also 100V rated. ;)

They are not rated for how long they need to operate at 100V. I guess three seconds is long enough? 😂

Hey, they could have done everything with one button but were super generous and decided to give double the necessary buttons.

That is the one thing I do not like about my Hakko; it has to be some of the worst UX design I've come across recently.

Nvm.... these things should be as far away from a laser as possible...

You can use a transformer n rectifier set up from a treadmill. They use 130v dc motors. That could easily supply any of these the mains ac/dc power at decent amperage.

I like the Ibput voltage, personally

You can tell it's Chinese if you end up buying it after watching KZfaq.

I prefer the "Operationg Instructions." That's another common translation error I see in a lot of products.

Damn! That electronic load must be enormous

I have the opposite problem. I own a 20.5 + 20.5 Vac 30 +30 amp iron core transformer and all the filtering capacitors and rectifiers... A linear regulator would be an insane waste of power!

@@robertc1161 not only Chinese products. Just something that applies to everything that has to dissipate heat

What kind of components? Stuff like capacitors?

Incredibly promising! :)

Very much like the very tasty very old desert.

Very much like the very tasty very old desert.

Yeah, I can't think of any path to an isolated DC supply of that magnitude that doesn't at least double the cost. Even something like a few car batteries or used server power supplies in series add up. Still probably a screaming deal, but you have to keep in mind the price of a usable assembly here, not just the core component.