I tried finding Hidden Gems on AliExpress AGAIN! (Part 4)

День тому

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You can find the featured products here: (affiliate links)
(Better) LED Strip: s.click.aliexpress.com/e/_DeY...
Heat Shrink Wire Connectors: s.click.aliexpress.com/e/_DCb...
5V Fan: s.click.aliexpress.com/e/_DC4...
Wire Strippers: s.click.aliexpress.com/e/_DD0...
5V/12V UPS: s.click.aliexpress.com/e/_DE2...
Buck Power Supply: s.click.aliexpress.com/e/_Dlo...
In this video we will be having a closer look at 8 different products I got from Aliexpress. Aliexpress is famous for featuring the newest products/ICs when it comes to electronics but finding those can be a bit difficult. So I tried finding the hidden Gems not only electronics related but in general what I think could be useful. Let's get started!
Thanks to Rohde & Schwarz for sponsoring this video.
0:00 Intro
1:37 COB LED Strip
4:17 Heat Shrink Wire Connectors
6:08 5V Fan (Fume Extractor)
7:05 Wire Strippers
8:49 5V/12V UPS
10:43 Lab Bench Power Supply
12:42 Verdict

КОМЕНТАРІ: 830

@greatscottlab Рік тому

CORRECTION!: After testing the cable stripping knifes, I realized that I had the perfect tool for it laying around. It is this one (also from Jokari, affiliate link): amzn.to/40ZBzWk No idea why I completely ignored it until now. Mistakes happen😅

@BloodBlight Рік тому

Would adding a cap to the output on the power supplies be enough to squash the noise? That would be a good video as well. Fixing the output ripple on them.

@NinoJoel Рік тому

Id love to See more 1865 UPS or other circuits involvong them

@micnolmadtube Рік тому

The solder didn't melt. You need to add more heat.

@getyerspn Рік тому

That's the tool I use at work they're fantastic for stripping multi core outer sheathing.

@gregjones3660 Рік тому

Can you feature digital fingernail clippers?

@corvusaflame713 Рік тому

Aliexpress is terrible to navigate. This series needs to be supported.

@greatscottlab Рік тому

True. It is hard to find the good stuff.

@gen4171 Рік тому

Aliexpress have power to make every ad into sextoy ad.

@Arctic_silverstreak Рік тому

Yeah, though its definitely manageable if you been there for quite sometime unlike some other site(e-commerce or not) that I've experienced

@rosskrt Рік тому

The search is terrible. Often, instead of telling me there’s anything that matches my research, it shows me things I’ve already searched for in the recent past.

@rosskrt Рік тому

@@iXenox well the sorting system on AE is bad anyways, so I might give it a shot. Thanks!

@Dynamicee Рік тому

You need to heat the solder sleeves more. The solder should melt almost completely so you have a good solder connection :)

@scatterbraintech Рік тому

I also don't bother pre twisting the wires. Just twist the wires back and forth to get the solder moving around and it will look completely solid

@dr_jaymz Рік тому

Yeah that annoyed me too. Needs to be hotter.

@someperson8672 Рік тому

There's only so much heat you can put in the solder-bead using hot hair through a plastic sleeve... each wire you try to solder acts as a heat-sink.

@Speeder84XL Рік тому

Yes, I also taught abot that. It was probably more the shrinktube (which also has glue on the inside), than the solder holding those wires together. It showed reasonably good result on the resistance test thogh. But clean copper on copper contact always have low resistance - the problem is after some time with moving the cables and with some oxidation. If done properly, it will be a nice solid connection that doesn't degrade over time.

@heatherryan9820 Рік тому

I actually use these quite often, and you’re right, in theory, you are suppose to heat up the solder more to completely melt it. But, in order to do that, you end up melting the wire insulation all around it which exposes the wire and negates the purpose of the connector. So it’s kind of a balancing act.

@Embassy_of_Jupiter Рік тому

Since you showed that tiny fan as a fume extractor, here's a project idea: Build a portable "electronics workshop" in a suitcase you can use literally anywhere, kinda like a cyberdeck, cramming as much features into it as possible, battery powered, perhaps even solar why? just because

@greatscottlab Рік тому

Sounds fun

@Mr.Engine993 Рік тому

Sounds amazing to me! It is definitely worth a shot!

@dfgdfg_ Рік тому

Check out the Omnifixo + pinecil combo

@Leonvolt28 Рік тому

It would be awesome if he could build something like this together with diy perks

@jonclement Рік тому

Then sell it as a kit for us to buy!

@JeffreyMichaud Рік тому

The grey stripper is a coaxial cable stripper, it’s not intended for general stripping.

@jmsaltzman Рік тому

Yeah it seems unfair to not recommend a wire stripper because of the limited wire gauge range.

@AndreasKoepkeAU Рік тому

Exactly what I was coming here to comment on. It is a specialist tool and does its specific job very well.

@WillHest Рік тому

Was about to say the same. It’s a great tool for what it’s designed for.

@Gloworm17 Рік тому

I would like to see if the output voltages would have stabilized with a simple electrolytic capacitor. It feels like they didn't even try to smooth the output and could be something done DIY?

@greatscottlab Рік тому

It seems like enough capacitance was there. Probably not ideal inductor and or pcb layout.

@haydenc2742 Рік тому

Yes please...see what it would take to clean up the output volts

@ArchiWorldRuS Рік тому

@@greatscottlab Any thoughts on making 5/12 V ups diy?

@TylerDurden-pk5km Рік тому

@@greatscottlab Are you sure, that the same error as here: ukposts.info/have/v-deo/n6Con5-BemuZx4k.html hasn't happened in this video?

@wiedapp Рік тому

I would suggest a LC filter, but I don't really know if it would do anything.

@GalgoczkiAdam Рік тому

The little yellow stripper is designed to RJ45 wallsocket installation. The little metal part at the end is for stuff the wires into the contacts. It's just an accessory of an RJ45 crimper.

@Michael-hn8bo Рік тому

I love them for work. I don't even take my proper punch-down tool anymore, this just does it in the palm of my hand.

@LordMithril Рік тому

I use the last one a lot, at least the controller part. Hooked it up to a 18V Bosch battery and use it for small electronic projects. Also perfect as you can see how much power your project draws. Way cheaper than a bench power supply and even portable :) Even used it to diagnose a broken windshieldwiper pump on my car :)

@greatscottlab Рік тому

Thanks for the feedback. Sounds useful

@MrMario616 Рік тому

I was wondering how much better you could get the output to look it you slapped on some condensations and spools?

@user-ok7hl9vc9s 7 місяців тому

@MrMario616 This device is a switching (Buck) voltage converter, to get a more quiet output you need to place a linear voltage converter after it and of course noise absorbing capacitors, nowadays this get's done often because the overall conversion loses less heat than a full linear voltage converter. b.t.w. if you hook this up to a battery, then there is no noise as it is DC, the noise is the zero cross component of the AC source

@yadrenmolotok 5 місяців тому

@@user-ok7hl9vc9sHi! Can I use capacitors between ac-dc converter and this one dc-dc to filter noice? Thanks

@user-ok7hl9vc9s 5 місяців тому

of course, capacitors alone will not do the job, you need resistors too, go find the topic of explaining about rc filters here on youtube, but in the end you need to think about if you want to filter high or low frequencies, in audio you often want low frequencies filtered agains hum in the audio, and in computer related circuits you need to filter frequencies that interfere with device working frequencies to keep clean address and data busses.

@mrlithium69 Рік тому

good tip about the rohde and schwartz youtube videos. and I love these hidden gem type videos !

@LaplacianFourier Рік тому

I love Rhode & Schwartz UKposts vidéos. They helped me when I was doing EM Fields and TM Line class.

@nutgone100 Рік тому

Those heat shrink solder connectors work a lot better if you add a little flux. Just a tiny bit of liquid flux is fine & drastically improves the solder’s wetting characteristics. I’ve done a few experiments with them, I wouldn’t use them without flux now.

@jeffbeisel5222 Рік тому

I love this series. Thank you for doing it. This has been my findings as well. Some items are amazing treasures and others are pure trash. I wish all the products had impartial reviews on them.

@roelesch Рік тому

I've used the heatshrinks a lot for 12V wiring inside my glider. They are a joy to work with. I didn't twist the wires though. Tip: if you shrink them from the outside inward, you trap the solder nicely inside. If you then melt the solder core, it spreads out a bit and you have a lot of contact area.

@helltp Рік тому

A side note on those small psu modules: 4-5 years ago when they started to get popular, Dave from EEVBlog made a couple of videos abut them. For the smaller DPS3003 he mesaured around 100-120mVp-p, for the RIDEN RD6006 he measured the noise levels being "at about 60mVp-p no load and about 100mVp-p at 6A". My point is that it matters which one you buy, I have 2 of these now and I bought them from their official shop and these perform based on Daves testing quite well, much better than the offbrand one you tried. Source: ukposts.info/have/v-deo/e6djdaCamrB5yGg.html

@MountainParameters Рік тому

Some very interesting items in this review. At 6:38 I believe that filter material is PAN carbon felt and not 'activated coal'. It is a good idea to use as a filter as you recommend. Apparently, if you can find it, PAN graphite felt has better electrostatic properties than PAN carbon felt, but as lead is a diamagnetic material, it probably does not matter for filtering smoke from soldering. As it is commonly offered in different thickness, I will probably use 3mm as the filter, as the other sizes may be too thick to allow airflow. I used the link to order some of those fans for cooling LED COB grow light builds. Also I ordered some of those strippers, but I found another seller with a higher feedback rating that has a stainless version so I went with that. And as a last observation, I recall that Big Clive did a deep dive into those heatshrink wire connectors that may be of interest to some.

@jafinch78 Рік тому

Rohde & Schwarz have some of the lowest noise floor spectrum analyzers last I knew. Ducting for the fan intake so the fan is slightly up higher along with the top of the duct and extra side width? Those UPS 18650 boards are great for solar cells or panels for use with devices like older models that use the AA or AAA where the only improvement beside the noise issue on that design is having like an adjustable output so those other buck boost modules aren't required to bypass the alkaline battery inputs.

@akosbuzogany2752 Рік тому

The new design line from R&S looks awesome. Hope my old RTM won't read this and become jealous.

@greatscottlab Рік тому

Hope so

@JoeldaSilvaVicenteFilho Рік тому

great stuff like always man!!! You know @GreatScott, you could do a follow up series where you get some of this products that almost could be very good and try to improve them, like the ups and the power supply, for exemple, making a adicional pcb to smooth the output, or change some components to make it usable. I would love to see something like that!!!

@Dorrrr1111 Рік тому

The UPS looks like a really cool item, can you try to find one that is actually quite? Or how would you solve the noise issue?

@chrisjeaaalbertos3802 4 місяці тому

The link doesn't work anymore :( really wanted one

@Spaniard47 Рік тому

I'd love to see more dc-dc power supplies tested. They make buck-boost converters as well which can take the input voltage and step it up or down

@petermuller5031 Рік тому

The shrinkable wire connectors look interesting, I have never seen those. Great if you only want to connect one or two cables and do not want to get out the soldering station. Plus, the heatshrink adds an additional layer of protection. Maybe I will order a pack :-)

@greatscottlab Рік тому

Go for it👍 I like them.

@LabArlyn Рік тому

I wonder how did you get early access to this video ? 🍓

@RicoElectrico Рік тому

The thing he missed but is present in the description - it's recommended to use a reflector nozzle for best results. I remember another UKpostsr has had problems joining wires without it.

@petermuller5031 Рік тому

@@LabArlyn Patreons get early access to videos.

@petermuller5031 Рік тому

@@RicoElectrico Thanks for the info. Sounds reasonable, since the solder probably requires higher temperature to melt correctly.

@TrollFaceTheMan Рік тому

Hey Scott, I just wanted to let you know that I think there was a translation error in this. It should be activated Carbon/Charcoal and not activated coal for the filter. Coal is the Oily/Tarry stuff from the ground. Charcoal is just made from burning carbon rich stuff like wood.

@smelma Рік тому

Looked it up, the German word “Kohle” means carbon, coal, and charcoal. So perhaps in German you’d just understand by context.

@PyroRob69 Рік тому

I bought some of the 18650 battery holders that had the built in chargers. I tested them with motion sensors on arduinos with wifi, and stuck them around the house. They did a great job. Of course, I did not check them on a scope for output ripple, but then again, I didn't buy the cheapest available either. I have used the solder filled butt joints for decades. I found that those with a bit of flux in them work much better, but again, they are not the cheapest available. When properly heated, you will not see the solder ring impression in the plastic any more. For the buck converters, I would only use those if I had a 12v supply in the project, and needed minimal 5v for running an arduino or a LCD. I wouldn't try to use them near max current load. If anything, I would add a couple filter caps to it and be done with it. Great reviews. It's cool to see some of the more useful items are still out there.

@Michael-fw7ch Рік тому

I love those solder connectors and actually just used some to connect 3 wires together. If you don't require the fully waterproof part, they still work good for that.

@hgbugalou Рік тому

I would really like to see one of those "UPS" boards that you can load up with at least 6 cells (minus the noise 😆)

@greatscottlab Рік тому

I will see what I can find ;-)

@haydenc2742 Рік тому

I got one with 4...but it causes my RPi4 to stop working after a bit...too much noise on the output...needs much better filtering/smoothing

@onix331 Рік тому

@@greatscottlab Can't you just add a capacitor or two on the output?

@someperson8672 Рік тому

@@onix331 He probably just measured wrong. Impedance matching is a real thing.

@DjResROfficial Рік тому

Theoretically you can solder extra sockets in parallel to existing sockets, it just takes longer to charge and the cell voltages have to match with 0,1V accuracy before inserting cells. And with output noise you can filter out by using low ESR capacitors and smaller ceramic capacitors in parallel at the output._

@emilracovita8421 Рік тому

Try to test the output with the short spring provided with the oscilloscope probes. Never try to measure noise or ripple with the black alligator clip because it is a long un-shielded wire that will pick up lots of noises that are not there. Although, the noise on that looks like the output has very little capacitance filtering and we can see the switchnode directly.

@BRUXXUS Рік тому

I got one of those little yellow wire stripper things with a cheap soldering kit like 5 years ago and tried it out for the first time a few weeks ago on some cable that was too thick for my automatic stripper. I was actually kind of surprised at how well it worked for the particular thickness of cable I needed it for.

@julithething2154 Рік тому

Would there be a way to clean up the noise from the output of the buck converter boards and turn it into a more functional cheap lab bench power supply?

@greatscottlab Рік тому

I will find that out in a future video ;-)

@sanjikaneki6226 Рік тому

@@greatscottlab Try to add a few caps on the output , then again that board layout seems BAD

@TylerDurden-pk5km Рік тому

@@sanjikaneki6226 The noise could probably be a measurement error: ukposts.info/have/v-deo/n6Con5-BemuZx4k.html

@kepamurray1845 Рік тому

I regularly use Raychem solder sleeves for multi core shielded wire and have none of the issues you mentioned. The Raychem sleeves do have flux in them and we use teflon insulated wire. It looks you didn't get it hot enough for the solder to melt in a few of them.

@oasntet Рік тому

I ended up with one of those little yellow wire strippers in a kit of solid core wire, and I love the thing. So much easier than my old strippers. It's really only good for small wires, but it's pretty good for that.

@bnasty267 Рік тому

Yeah, I use mine for CAT-5/6 cables, and it works great. The plastic hinge only applies a small amount of force on the blade, so I spin it a few times and the outer jacket pulls off with no nicks on the twisted pairs. Cheap and effective.

@AlexanderBurgers Рік тому

the yellow tool is actually a punchdown tool (to connect telecom and network wiring in punchdown blocks), the wire stripping bit is almost an afterthought, and it shows. (the punchdown part is also pretty meh, but it's better than trying to punch cables in with the tip of a knife or a screwdriver.) For a few euro more, there are very nice punchdown tools, but I haven't needed mine since I got out of IT/Networking.

@DanielsGameVault Рік тому

You should make a video where you try to improve the adjustable power supply module to get rid of some of its noise. I have a slightly older version of it and could really benefit from such an improvement :)

@RubenKelevra Рік тому

8:45 interesting. Got the grey one and love it. I actually never change the tool size, as everything small is stripped by the automatical wire stripper plyers, so only large cables are stripped with the grey tool :) I selected the "6" setting on it (largest diameter), put the blade to B and the spring to C and adjusted the screws to 1.88mm (blade) and 2.0 mm for the spring. Hope that helps.

@-MrDontCare- Рік тому

I love this hidden gems videos. I have been looking at those Heat Shrinkable Wire Connectors myself, so I will definitely get a set of those.

@greatscottlab Рік тому

Glad you like them!

@court2379 Рік тому

@@greatscottlab I think you need to heat them a bit longer though. The ring of solder will fully melt and then the heat shrink squeezes the wires and solder together. I don't try to twist the wires if that is what you were trying to do. Just push them into each other. I suspect it will hold the solid wire too if you melt it longer, but haven't tried it myself. Either way they are a great product, particularly for cars and other outdoor wiring.

@heatherryan9820 Рік тому

Yeah I’ve bought a couple of those 18650 power boards before, and I’m not sure that they are the exact ones that’s you tested, but the ones I got overheated really fast. I think those are a good idea though because I’ve got a bunch of 18650’s just laying around and would love to find a power board that takes those abs outputs to either USB or solder points.

@stinkycheese804 15 днів тому

The UPS that you mentioned at 8:40, I wonder if you had considered measuring the output after adding another low ESR capacitor in parallel on the output? I recall you mentioned adding a linear regulator (possibly on a different video about this UPS board?) but many projects don't need power that well regulated, and a linear regulator is a fairly large commitment to make on something battery powered (if/when serving its purpose). It almost seems like, that at the very least, it would be more efficient to just add more capacitance and then if the voltage spike is troubling, to zener diode shunt that to ground above whatever voltage # that you find troubling? Also did you make it clear at what output current the ripple is so large? I would not expect most people to buy that if they actually needed to power a 3A load, more likely some lesser current would be more common like around 1A if even that.

@dylanevans5644 Рік тому

Thanks for the video. Do you have any content on what 'bad' output noise does or what effect it can have on electronics? If not it would be a really interesting video to me at least. I had a "usbc to 12v" adapter cable that I used to power a pci card a while back, and it caused the pci card to whine very audiably. I wonder if this was from crappy output on the cable.

@Aussiechip Рік тому

I use the grey/brown stripping tool with the orange insert all the time. It is SPECIFICALLY designed for stripping coaxial cables. It's not a generic cable stripper. If you were having poor results with it on normal cables where you only want to strip a jacket that is a few mm thick, I'm not in the least bit surprised. You wouldn't use a hammer to peel an orange, and you wouldn't use a knife to drive in a nail. Use the tool for what it's intended and you'll get way better results. The coax stripper is also only designed to cut the insulation and the dielectric. You must not use it to pull the material off the cable - do that separately by hand. It's easy once the cuts have been made. If you try to pull it off with the tool, you'll damage it. Changing sizes is intended for situations where you normally strip one size (say, RG6) but occasionally need to do a bit of RG59, for example. If you're doing a lot of both, get two tools and leave them set up differently.

@rolen47 Рік тому

8:02 The grey one is mostly for coaxial cables. If you look inside of it you'll see that it has 2 blades. One cuts the outer insulation and the other cuts the inner insulation. The 2nd blade also has a small divot that the copper wire in the center goes through. The reason you cut coaxial cables with 2 different depths is so the end piece fits on perfectly.

@HendriuGaming Рік тому

Hey Scott, i have a question about heat shrink connectors and i would like to get answer :D Everytime i see them i can see that they connect wires, but soldering is not the best, so have you maybe tried using some flux on the wires so solder could flow better and also bond better? As i can see on many videos they bond mostly on the surface and can't get proper penetration inside wires, which is big bummer for me, because they look really nice and are handy for many applications. Thanks for answer.

@helltp Рік тому

I'd really like to see a properly functioning 18650 based mini UPS like that. It would be a very good fit for a lot of RaspberryPi based projects.

@lazar2175 Рік тому

I'd like to see a similar board with more cell capacity so you could use it in projects as a power source. Imagine building a portable Bluetooth speaker, LED flashlight or any other project that needs portability. Just take this board, load it up with as many batteries as you wish and you've got a 5/12v power source that has USB recharging and over discharge protection. Of course, it wouldn't be viable for huge battery packs, but if you just wanted to power something small like 5-10W, you wouldn't have to mess around with a BMS, at least 2 buck/boost converters and hell of a lot of wire to get the same functionality as this one.

@BerkmanLord Рік тому

@CME @helltp Would hooking up some caps at the output help? Curious!

@lazar2175 Рік тому

@@BerkmanLord Well, the best way to answer that would be to try it out. But I think it would be possible - it's just a question of how far are you willing to go with it? Most USB devices will function with this, as is. Hooking up a small capacitor/LC filter onto it might make it technically better but you wouldn't notice any real changes. I wouldn't use this for something sensitive, like audio amplifiers or medical devices, but if you intend to use it as an UPS for your router or some LED lights etc it should work just as fine.

@BerkmanLord Рік тому

@@lazar2175 Many thanks!

@crazzywolfie Рік тому

@@lazar2175 what about if you were wanting to use it with something like a wyze cam? i already bought one not really knowing the difference but there is very limited options out there when it comes to something like a 5v UPS. this one just happen to look really convenient.

@Kiramitsuoka Рік тому

Oh, the troubles with the Jokari Super 7...bell transformer cables (Klingeldraht) or anything below 2x1,5mm² and the Jokari are a nightmare. In the end, I ended up using the wire stripper that came with my network cable tools which works similar to the grey one you show in this video, but the blade is on a screw for adjusting. Works...okay for anything below NYM-J 3x1,5mm² down to about 2x0,5mm² where it starts to srtuggle a bit. Still looking for a wire stripper like the Jokari that works with anything from NYM-J 5x2,5mm² all the way down, but so far, no luck.

@SimonLongTenor Місяць тому

I have a few tools for Cat 5, but I use the yellow one most often, it is quick, easy to use once you get the feel of it an easy first choice for speed and consistency. No issues with quality as it's light use. Only does one job but does it well!

@Mont_gone Рік тому

Love this series! Given that it's not easy to get a decent bench power supply for cheap, do you think theres a way to clean up that noise? Or perhaps theres another power supply you can recommend?

@deserRGB Рік тому

I'm also wondering

@StephanBouwer Рік тому

That yellow wire stripper... I used it once, it was a very spesific tool, used to connect cat cables to the female receivers that goes in the wall. Never tried using it as a wire stripper though 😁

@eprofengr6670 Рік тому

Nice overview on lab equipment, lighting effects and sourcing issues.

@SolaLupus Рік тому

It could be useful to show us what ICs the various SMPS based boards use. Also, could the output noice you demonstrated some of these have, be mitigated/lessoned with adding various extra output capacitors or is it inherently caused by flawed design?

@rosskrt Рік тому

About the intro: that’s no mistery. Most people on AE leave reviews upon receiving, without even testing what they got. The Q&A section is always a dumpster fire, so that’s at least a great way to entertain yourself.

@greatscottlab Рік тому

Haha good to know.

@ChristieNel Рік тому

A great collection. I've been using that yellow stripper for years with much success, but liking the look of the grey one. I had a look at the red one before, but I need it actually to cut off the sleeve. For thicker cable I just use a hobby knife. I'm liking that fan for fume extraction as well.

@MasterAlt Рік тому

I use the gray one to strip coax cable

@XavierGr Рік тому

I could watch these AliExpress review videos all day. I think you can have contents for months with this series.

@evanbarnes9984 Рік тому

I would love to see how you would go about filtering the output noise from that last power supply! I have a couple of similar modules, and would love to figure out how to stabilize the output voltage.

@dr_jaymz Рік тому

You first need to check if you need to. The scope is telling lies. Theres fast switching involved so there are large transient stray fields radiating from bare pcbs. The scope picks these up because the flux cuts the scope ground lead and you see a scary waveforms. 5pc ripple is expected but the rest probably isnt real.

@FLABrowncoat Рік тому

This is a fantastic series, surprised no one else is doing this.

@gelisob Рік тому

12:23 what was the price of the thing you compared the 25€ powersupply to? :) are they world apart in regards for value per money given? or are there similarly priced things that have better quality in the output?

@Ioniq28kwh 8 місяців тому

Hi @greatscottlab ,thanks for your videos, . I have this power supply, just burned the D10 (diode i presume) located near uotput terminals, . Do you happen to know part number , so I can replace it, i cant find data anywhere

@TheForgoten100 Рік тому

I'd really be interested in more LED videos. There are so many options and so many small components that differ that can make the difference between buying or not that people just don't realize

@faeinthebay Рік тому

Yeah, he hasn't tried the truly addressable CoB LED strips. No segments or external ICs!

@bojackson3073 11 місяців тому

I got a bunch of boost converters for 18650 batteries for between $1-3 on Temu and battery boxes for around $0.50-$1 there as well. They work great but I'm curious if you would recommend them!

@PrajjalakChattopadhyay Рік тому

As the beginning of my PhD work (in the field of experimental high energy physics), I designed a boost power supply that will be providing bias voltage to silicon photomultipliers (SiPMs). The output voltage is adjustable from 49 to 58 V, with a 3.3V input (1mA max current). Since the gain of an SiPM strongly depends on the biasing voltage and temperature, a very precise power supply has to be used. Our target is to reach a noise level of 0.01V peak to peak, and even lower. Also the design goal is to measure the output current in tens of nanoAmp order accuracy! We are still working on it, and will hopefully publish my first research paper soon. My point here is that designing a switch mode power supply is easy. You choose the right components, design the schematic and PCB following the guidelines given in the datasheets, and get it manufactured. That's what I thought initially. Then I measured the noise levels, and it was a disaster. It's really difficult to get the switching noise out, especially at higher voltages. Trust me, I learnt it the hard way. There is no surprise that the power supply modules showed terrible noise levels.

@bazrazin1 Рік тому

please suggest a suitable circuit for 5V ups, i had made on for my clocks so that it works even case of no mains power using a dc boost converter & tp4056 charge board, it worked fine , but at the end just before the battery cuts off i think it gave a huge inductive spike from the boost converter at the o/p which damaged not one but 2 clocks of mine, after recharging the circuit works fine.

@MCsCreations Рік тому

Fantastic, dude! Thanks a bunch! 😃 Question about both power supplies: couldn't a capacitor on the output help with the issue? Anyway, stay safe there with your family! 🖖😊

@augustpihl7268 Рік тому

I use the heat shrink solder connecters on a daily basis. I'm an security technician and work a lot with small wires mostly around 0.6mm2. The connecters are amazing, they are tiny compared to other connecters and if I solder the wire together myself. I haven't had a problem with hard wires, maybe you need to heat it more, I tend to use a lighter, it's a bit easier to carry around. And for small wires you can connect multiple, I've connected up to 4 wires in a connecter.

@thomasbjerregaard1080 3 місяці тому

Did you try to cut open the cable chrimps after heating them? I ordered a set of them, but after testing a few times I discovered that the solder did not wet out the copper standsa at all, it just molded around it but could be peeled off using only my fingernails I can't even get it to wet out the copper when applying heat from a soldering iron directly on the solder I don't think it works much better then hotglue on twisted wires Any thoughts on that?

@dtiydr Рік тому

5:49 It work perfectly fine as long as you do as supposed by letting the solder completely liquefy and wick the cables! that is the reason it did not work since you can clearly see that solder didn't attached to the wire since it never had time to or more the temperature was so low or dirty wire.

@waylandsmith Рік тому

I downloaded and translated part of the datasheet for the LED IC. What's weird is that it's ALMOST exactly the same protocol as WS2812b. They're both RTZ signals at 800Kbps. The timing thresholds between lows and highs are slightly different but NEARLY compatible with each other. The FL1903 needs a relatively long reset of 200µs between chunks, but that's still in spec for WS2812. Besides that, the difference is the order that the colours are specified. R, G, B instead of G, R, B for WS2812. Should be really simple to get this working with existing LED controller software, but as someone else already commented: why did they bother with a different signalling protocol that's almost, but not quite identical to WS2812, and certainly has no improvements like increased data rate, improved colour resolution or built-in brightness scaling.

@UNgineering Рік тому

thank you for another helpful video! one suggestion though: when showing the noise on the dso, try to keep the same v/div range, otherwise it looks like the cheap power supply is only slightly worse than the high-end one.

@talk9415 Рік тому

Love this series! Keep doing it bro, please check more products in one video it's really useful

@mikesgarage394 9 місяців тому

I got the Buck power supply for charging LiFePO4 packs during testing, much cheaper than the big brother of your Battery tester ~ $85 with a 60v 1200 watt switchmode power supply.

@JamiePineappleWyatt Рік тому

About the heating connectors/shrink wrap, so what was the resistance like? People are using these on higher power ebikes and scooters and honestly I don't think its a great idea for something like the phase wires seeing as its incredibly low temp solder.

@Shazzkid Рік тому

Love this series, hope it never ends

@Suzuki_Hiakura Рік тому

Those wire connectors are similar to what they used in ww2 to repair wires in the field. Was basically the same and would join the wires in a moment... very useful when under fire.

@hiredgoon4269 Рік тому

You can most certainly splice more than two wires together with the solder sleeves, and they're also good for hooking up a drain wire to a shielded cable. Also, you didn't heat them up long enough; the solder was not done flowing. There are much much higher quality solder sleeves available from Raychem and TE, but they're also much more expensive.

@reidprichard Рік тому

I've heard those solder sleeves (and soldered connections in general) can be bad for automotive applications because motion of the wires can cause breakage from the solder stiffening the wire. I believe regular crimp connectors are preferred.

@GTrainRx7 Рік тому

I actually use one of those yellow strippers all the time. Works great for the very small range of wires it is suited for, I think I bought 5 for $5 or something (since it is Ali, getting 1 was about the same price and quality issues..). Not to say there are not better options, but they work for me :)

@ClickClack_Bam 7 місяців тому

It works great for me too. No clue why he shit talked it when he didn't even use it correctly.

@ladislavzenk2139 Рік тому

Hi Scott , i worked few years in Rohde & Schwarz Vimperk in Czech , they make very nice oscilloscopes

@sebastian.salmhofer Рік тому

The wago connectors have a totally different use case than the self soldering splices. Wagos are for changeable connections and are mostly used for building electrical systems. The splices are to splice wires permanently for repairs or changes, so the better comparison would be crimpable splices. I have even seen them (well not from Aliexpress, but the same type) used in avionics, so they should be good and reliable if the quality is okay.

@lohikarhu734 Рік тому

I don't know where you are located (Süd, Nord?), but I'd love to have a run-through on the MXO-4 with you! (I was an Oscilloscope AE at R&S in München for 3+ years!)

@DumahBrazorf Рік тому

I'm using for a while the ups with my home assistant raspberry. No issues for now. Do you suggest to add a couple of big caps on the output?

@refraggedbean Рік тому

that gray wire stripper tool I have, and it constantly ruins my attempts at stripping the outer layer of CAT6, I can try all I want but it will still manage to always damage the twisted pair no matter what size I use, at least on mine

@fabio-franco 20 днів тому

For the wire connector you can use heat shrink jackets to increase their diameter and make a better seal. Works even with solid wires. My favorite solution to stich two wires together

@ibomemo5571 5 місяців тому

Regarding the UPS's DCDC noise issue, better to try with a nominal current sinking because some of them have a low consumption mode in idle mode to prevent to use to much energy while they are supplying nothing.

@sygad1 Рік тому

I really like the "hidden gems" series, please keep making them

@4dirt2racer0 Рік тому

whatsup man : ) i have asthma and its been kinda kicking my ass lately, iv been needing the nebulizer almost every night just to get back to sleep, but weve also been losing power a lot lately with all the storms this spring, would it b practical to build a backup power supply using about 20/30 18650s that would b able to handle about 2A @ 120v??

@diegoochoa572 Рік тому

there is an actual hidden gem version of the led strip adafruit's been selling quality versions of those strips for a really good price and their library is impeccable

@CRC.Mismatch 3 місяці тому

8:00 the stripping tools were probably misleading announcements, or even worse, subverted manufacturing... The first tiny yellow one is usually bundled with RJ-11/RJ-45 crimping tools, and the "grey one" is usually meant for different sizes of coaxial cables (it usually carries two blades, with center indents to allow for the central core to pass-through) - thus the "6" position would actually strip an RG-6 cable perfectly, ready to insert into a crimping lead...

@CLARVO Рік тому

I ❤ this series. It gives ideas about the new modules in our market and give us info about which one is legit or fake. Waiting for more like this content 😊

@erwinvb70 Рік тому

These heat shrinkable wire connectors are fantastic for motorcycle wiring repair. They are easy to work with and the repairs do last fine over time

@pault6533 Рік тому

I noticed the capacitors on the UPS do not match the XR2981 recommendation of one 470 uF capacitor with 22uF low-ESR tantalum/ceramic in parallel. Perhaps two 220 uF capacitors in parallel as supplied do not filter sufficiently. I am changing mine out to meet the spec sheet. I also noticed that the only thing needed to change the voltage output is the value of R7; 30K=5V, 63K=9V, 87K=12V. For increased cooling one might want to remove the cell holders from the back side of the board to double convection to the board, or attach a fan/heatsink.

@Sttreg Рік тому

This last item is really interesting. Do you have any other recommendation for affordable lab bench power supply? Also, an idea for the next video: soldering helping hands. There are so many out there

@greatscottlab Рік тому

Thanks for the feedback. Good idea. Sadly no other recommendation from me. But feel free to try the features one out. Very good price/performance ratio.

@Sttreg Рік тому

@@greatscottlab Well, the other question I have, what possible issue would there be, with the noise of this power supply? I'd mainly use it to configure LED, or arduinos, or stuff like that, in the same voltage range. If there aren't many issues, I might very well buy it

@nimoy007 Рік тому

@@Sttreg As long as you are powering "dumb" LEDs and they are isolated from your microcontrollers, that should be fine. Probably best to not use it for the Arduino.

@theoneohmresistor Рік тому

if you want to go for decent and low noise then RD6006P version (its switching+linear)

@kyme32 Рік тому

Talking about psu/buck convs, i use for long time 2x dps5020, there is also custom fw for them and it rullz, for almost all my usage it's perfect, perhaps you'll be interested, i'm pretty sure you can find details on youtube about it

@tudorelacatrinei143 Рік тому

I wish u d make more of this series. Really love it. Keep up to good work!

@amyshaw893 Рік тому

What happens if you just place a big smoothing capacitor at the output of the power supplies?

@greatscottlab Рік тому

Sadly that does not fix the problem. I might do a separate video about the topic.

@haydenc2742 Рік тому

@@greatscottlab Yes Please!!!!!

@nguyen_tr Рік тому

After see that output noise of buck module and boost (ups) board, I wonder if you have ever made a video about output noise of other common buck / boost converter?

@tin2001 Рік тому

That grey wire stripper is likely meant for coax cable, not really anything else. It should have 2 blades - one to do the outer and one for the inner. The spacing between the blades is fairly common across lots of coax connector types. And you're meant to adjust it for your cable type and leave it set. I keep one set up for RG6 and another for RG58... And I wrote that one them.

@emmettturner9452 Рік тому

I need a current limiting PSU for safely hunting internally shorted ICs. Do you think that PSU would be good for this?

@SDogo Рік тому

Some of those adjustable PSU (the last one) have a hidden rs232 port inside. You can even enable the thing in the system menu and control the psu with a pc or something.

@RetiredRhetoricalWarhorse Рік тому

So I've just had to trash a "Mini USV" a few weeks ago I was using to power the cable modem. Add to that the video you made about the difference between W and VA... I wonder do we know about any quality mini USVs and wall warts / power bricks out there?

@theoneohmresistor Рік тому

IS USV USB?

@RetiredRhetoricalWarhorse Рік тому

@@theoneohmresistor No, it used barrel jacks. Most modems and routers don't run on 5V...

@kmoecub Рік тому

The solder heat-shrink connectors are great. While the instructions have you twist the wires, that is not actually necessary. The heat-shrink provides more than enough mechanical force to prevent the soldered wires from coming part.

@ShrirajHegde Рік тому

Can't the noise problem be fixed using a Supercapacitor on the output end? Especially for the USB UPS since it seems like a great product for things like routers which sometimes take a solid minute to boot up if the power supply is interrupted.

@zodiacfml Рік тому

the wire stripper is interesting. it's probably the best way to strip a wire but the device could use a redesign. the fan is also interesting as I have a 12v server PSU fan doing nothing, hooking it to 5V could be useful to blow air to my hand.