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- Опубліковано 8 гру 2015
- Inside the Siglent SPD3303X Precision Programmable DC Lab Power Supply.
amzn.to/1m9Knp2
UPDATE: There is an even cheaper version, the SPD3303X-E which has 10mV/10mA resolution.
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Atten PSU teardown: • EEVblog #440 - Atten P...
Rigol DP832 teardown: • EEVblog #511 - Rigol D...
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the 2020 version : banana connectors now with correct hole. the wires are now secured with cable ties, the too hot bridge rectifier is now 56C, no more screensaver, both setpoint and actual are displayed at same time. idle power usage 12W all outputs off.
Thanks for the info! I'm thinking to buy one
Thank you for the updated info!
There's newer firmware too, right? Maybe fixed some of the annoying UI details.
I've got yesterday (5/2024) the same model the X-E and the terminals distance are not ok. Do you think that I've got an old stock? But 4 years it's not reasonable.
@@netlogic1ify they are all like this, and it is not a huge problem, since today we all use standalone banana cables
This is an old video but I think it's worth giving an update on the SPD3303X-E that I just bought.
First of all, I am not seeing any of the Siglent rust in there, it's all nice and clean steel sheet in there.
Second thing is about the mains wires. They clearly have seen this video because the main wires are no longer ty-wrapped together with other wires, the no longer run along the sharp edges of the steel sheet and they now also have a very rigid extra plastic sleeve over the wires for added protection.
edit: Third is the UI, the new UI still shows the timer but in a small font and the display now shows both the settings for voltage /current and the actual voltage/current. Best of all: no screen saver anymore!
The only thing (which I don't remember you mentioning) is the lack of a sense input for both channels. It's a bit strange to have a power supply that can supply 32V @ 6A with a 1 mV adjustable voltage level without a sense input.
I love the way Dave is so up-front with these reviews / teardowns, even after having the CEO of Siglent in the lab this week. lol
No holding back. I like it. :D
Message to Eric of Siglent, make all the improvements mentioned in the video and add $10 to the cost if that's what is required. It will benefit you in the long run!
Siglent is rubbish like all other Chinees electronic products. My 2 Siglent supplies (bought in 2015 having problems).
@@yoramstein bruh marco reps never had problems with his supplies. Maybe you received the dodgy ones.
@@DoctorThe113 Marco Reps will. Even their 4mm banana plugs and their Crocs are sh...t. Probably you work for the Chinees government . One thinks he got a deal with Chinees product . end story is that he paid more cause the rubbish will last 10% time of the American. Japanees products are different story. I make a video soon showing what wrong with my supply (encoder cause voltage jump to highers level, Transformer that zooms terrible all this after maybe 40 houre of use. DONT WASTE YOUR MONEY on Chinees equipment ! They are worthless ! NOT SIGLENT, NOT RIGOL amd sure not the small un known manufacturers.
@@yoramstein but you do have Chinese oscilloscope, don't you? And I don't work any country. What I do is just hate the hatred toward Chinese product. If you don't like Chinese equipments then don't buy it. You buy it because you can't afford the great sh*its. Like keysight (although they're truly trustworthy).
If you have problems with psus then why don't you upload your complaints at their review campaign. Maybe they will improve.
Siglent is relatively new company. They don't have the same experience as other companies. I admit that some siglent can be dodgy but keysight can be too. Keysight 3000x scopes used to waste 6 watts of power while it's turned off.
Instead of asking people not to buy it maybe you should head to their honest review campaign.
www.siglenteu.com/news-article/win-siglent-x-scope-or-x-generator-just-for-giving-us-a-review/
@@yoramstein fun fact: did you know that agilent rebadged rigol ds1052e as it's own? Dave jones said it not me!
ua-cam.com/video/w6MdhoV03e4/v-deo.html
Yolo, that's all I can think of for now on when I see a Siglent review.
+jak p (skiguy09) Yolo :) They have to adopt on the welcome screen :)
+BMR Studio "Yolo, all your base are belong to us".
Somehow I realy like this YOLO :) Is so unique :) Dave, I think we like the YOLO as series name. Better than X... Everybody use X . X factor, XXX, Xover, Xmas... Xman, MDOX, X70... But who has YOLO? Hack this puppy to show Us YOLO welcome screen :)
+jak p (skiguy09) They can fix it. Dave, get Eric on the phone because YOLO! There's no time to lose!
+jak p (skiguy09) Yolo what would be really cool? If that guy came back on the show with a Yolo shirt!
shorted turn on toroid transfomer! ooh, something else I wasn't aware of! Thanks +EEVBlog! learning more everyday!
Always love your channel, love the detail you go into with teardowns
Feel-o-vision, love it.
Love your work, man.
the chassis is not laser cut, the deformation at the edges shows that it's stamped/shear-cut
Looks like 5mm banana plugs would fit perfectly. Also that BNC adapter looks like it would fit directly into EU style mains socket and could be reason for using different spacing.
Those terminals not getting a good connection with a standard banana would drive me crazy. They will need to fix that.
+Alfred Stampe Seriously, how does that make it even out of the CAD software?! Is there any reason why they do this?
+Alfred Stampe Unbelivable, even my crappy 50$ power supply has better binding posts...
Hope those are not fixed permanently to the front panel, I'd immediately change those (or buying a rigol instead)...
+YensR of course, it´s all 3rd partie may 2nd source as well....you order these things from an oem....
+TubiCal Tubical around here...
how you doing mate?
good...:) i always use to watch Dave´s videos...Hope you´re doing good as well...?
Perfect timing Dave, was just choosing between Rigol and this Siglent. Ordered Rigol for it's display and regulated ch3
Reviews like this make me smile when I recently picked up a BK Precision 1660 (yup old but in great condition) for $100 Cdn :)
Love that relay oscillation...
Dave, you should put it in graph mode when you connect it to the PSU killer, would be awesome to see what it shows when it goes full panic.
Agree on the binding posts. Wow, unreal!
Those banana plugs are inexcusable, the rest of the instrument is irrelevant.
+Andy Lawrence Well those 90+°C diodes are not so irrelevant I guess...
+Krisztián Szirtes While not exactly good design practice, a lot of power semiconductors are rated for a junction temp of 150C instead of the usual 100C that you see in ICs. Is it going to last for 30 years and still be just fine like an old HP power supply? Nope. Is it gonna die in a month? probably not.
+CKOD I am not concerned about the diodes, even if I had baked a few but more about the PCB itself. The epoxy or phenol based or whatever PCB that is just burns and bends, that way ruins the traces and might even crack or completely cut them. The diodes are fine, but the PCB manufacturer probably didn't use "/godmode 1" when made the boards.
+InXLsisDeo As I look back at the video, at 25:58 it's more like the redesign is a must thee.The electolitics will dry up in no time considering what the full lifetime of the thing should be.
+InXLsisDeo Ha, as I see I'm not the only one that gets the """ and similar shit after editing the comments :D
Thanks for the useful review - it looks really similar internally to GPD-3303S from GW-Instek
Non standard distance for leads? YOLO!! Cheap caps? YOLO!! Scraped mains lead? YOLO!!... Non twisted-pair ethernet bridging?? YOLO!!!!!!
+Diggnuts Yolo, you get what you pay for......
+Diggnuts YOLO!
2:08 "I hate it when the hole is too small to poke your stuff through"
Yeah, it's really annoying trying to get your *stuff* in small holes ain't it Dave?
I don't get it
Ichabaud Craine Think of it like this, what happens when you plug a male banana plug into a female plug?
I thought small holes were best holes?
Talking about TO-220 package components vibrating loose, I resurrected a cheap XMH ballast a while back in which the input voltage regulator actually vibrated loose.
The chassis will be metal pressed not laser cut, if you look at one side of the sheet it is curved over on the edge (would of been the top side of the sheet as it was pressed), and the burr is from the shearing force as it is pressed (would of been the bottom side of the sheet). i used to do metal pressings years ago.
thanks Dave, I'm glad that we have someone like yourself that knows what their doing and has the tools and knowledge to thoroughly test stuff.
Hi, great video thanks, enjoyed it! Even decided to get one of these albeit the X-E version. A question have you tried to connect this power supply to Labview NXG or Labview? I am trying to use it with Labview NXG, but cant get it too match the driver to the instrument.
Hi, Dave. Love the great work. Bought the siglent PSU because of the bang-for-the-buck. Happy with it except for the non-std spacing. Don't get that at all. But, when I got it, one side of the units paint was delam. I took pix to share if you'd like.
KJM
Yes please on the shootout with DP832, thanks!
It would be interesting to see the output on a scope when it does its switching thing (oscillation)
All looks great, except no current limit on the #3 fixed output is a little bummer and of course the oscillating relay.
Hi Dave, I always love ur vids. Just wondering, and maybe it doesn't matter to you coz you can fix it yourself or whatever, but when you break the security seal on a brand new appliance, do you care about the voiding of your warranty? I know you joke about it on older gear, but... Cheers mate, and Merry Christmas to you and the fam.
Love the blue wire labelled 'brown'.
If they consider repairing the banana plugs issue, screen saver and out of range message, and also that possible hotspot on that rectifier. I would buy it.
I would'nt be let down by an out of range message or a screensaver that can be turned off in the settings ;-) But the binding posts are indeed very annoying.
Dave at his finest... objective with good valid critisme.
* lack of bind post standard
* Way to loose fitting
* Display not incl. helpfull adjustment info & limits.
Though the trend / grpahing on the units display, looks nice..
and the colored graphical display, do like that.
The binding posts quality and non-standard separation is a serious issue. It will stop me from buying it for sure.
Good video. CH!
@eevblog im sure in setup menu u have option for screen saver and desactivate that
Dave it feel like you recieved a pre-production unit? Cant just understand why they would miss on so many important things like the binding posts that is no good at all hope they take your
advices and change to better quality parts Lelon caps common go for something better like Rubycon or NipponChemicon?!
One thing I would want a big obtrusive message for would be for when the thing goes from constant voltage to constant current. Sometimes a short in your device under test is survivable for an instant, but other parts in the device under test may overheat and fail if left that way for too long. For example:
Motor controlled by MOSFET fails with a shorted winding
Power supply beeps and says "CURRENT OVERLOAD!"
Technician hits the "output off"
MOSFET survives
With a shorted output at a 3.198A limit, the feedback circuit is probably keeping the voltage drop across the power device the same no matter which voltage setting is used right? Unless it doesn't automatically switch taps as the current limit is reached.
Dave - short out the 5v supply and see what happens! Does it blow the internal fuse? That's the killer for me, it should be current controlled.
Rob
Very helpful video, thanks. Sigmund has since changed the banana plugs and other than the spacing which has no meaning for me they are OK now. So I just ordered one of these. I also looked up the data sheet for the Lelon capacitors. The 6800/63 is rated 105°C, 3.6A ripple current, 3000 hour life at full load @ temp. That is spec for spec as good is the Nichicon, Panasonic, or CDE caps. I know you are not a fan Taiwanese capacitors but in the absence of any data to the contrary and if you can believe the specs, that’s about as good as it gets for a filter cap.
Mark, is there a date code on the supply you purchased that has the banana plugs updated?
Couple of notes:
1. STM32F2 series is absolutely not running Linux. It's a standard Cortex M3 microcontroller.
2. You can't hear it switch when you go through the voltage range because the default current limit is set to 0. You have to increase it before the output voltage actually increases.
28:50 ".. that I managed to kill a production power supply with before..." Was that on camera? I would love to see that.
+90msg90 ua-cam.com/video/Fya-4mjV4N4/v-deo.html
+EEVblog after they changed the transistors, it seems to be a pretty decent supply, for the price. I got one of them too, and quite happy with it, AFTER i changed that annoying fan. ;)
+90msg90 comment i was looking for! :D
Those binding posts are a real killer for me ...
Could the non-standard jack spacing be an attempt to prevent people forgetting about the internal relay output configuration?
Dave you didn’t tell me till the end if there was a loop formed by the bolt through the toroidal transformer. But great video as always.
At around 20:40 you talk about the Atten power supply being completely horrible, but when watching its tear-down video, it sounded like you were more content with that one than with the one in this video.
Digital knob is really poorly sensing the up/down when quickly scrolling the knob.
I find that a deal breaker and I also prefer instant voltage change.
Why would it be better to wait a second to change it!?
This only makes it even more annoying to set the voltage/amps!!!
And thank you very much for a really good review!
Great vid, as usual. The poor quality of the front panel connectors is very surprising. And failing to use the standard spacing between them is nuts. I wouldn't buy this thing, just because of those problems.
The whole digitization of the interface is a mistake on a PSU. It should remain simple and 99% analog. An ARM microprocessor in a freaking PSU give me a break.
Dave - Thanks for the video. I am a "bit pusher" EE so don't know squat about transformer design. Question about your comments about "shorted turn" at 5:05 and the bolt through the middle of the torroidal transform. Is this an issue because it could change the magnetic fields/properties of the transformer? I assume so as the insulating washer under the nut (very hard to see - not the big purple thingy) breaks the continuity.
Cemx86 Bolt & sheet metal bracket(s) create a magbetic current path paralleling the windings. Only it is a closed path, hence shorted. Putting a gasket between the toroid & bracket spaces them apart & reduces the effect.
+davecc0000 That purple gasket doesn't reduce the effect at all. As Dave mentioned, there is an insulating washer under the nut which eliminates the short.
Siglent Listened to Daves advice @ 25:35 the modified the display just as he suggested
I know it's a little off the cuff, but I'd like to send you a product for review that is a bit of a departure from your normal reviews. It's an open source BBQ temperature controller called the Heatermeter. It monitors temps, and controls the temperature of a CHARCOAL smoker/grill with a fan and automatic damper system.
Does Siglent have Hantek manufacture these for them. A lot of things point to that like the buttons, LCD and that red sticker on the LCD and the UI.
I know you've got a load of Siglent/YOLO toys, but could you please finish that GW Instek 1000B series oscilloscope review?
Hey Dave. I'm wondering if you would recommend that to a hobbyist who needs a good psu with rail to rail so I can do light audio and opamp stuff. I'd really appreciate your opinion
It seems like decent unit, but few small little touches and it could be a quality unit.
I hope Siglent is watching :)
Those fixes wouldn't break a bank for them to do.
Hay Dave. Found this and wanting to buy, but not sure about it. Wahy do you think about the HP 8757A Scalar Network Analyzer?
Where did you got this nice blue "Fail" button? With a very attractive sound :)
i would say it would be a powered mic test where you have +/- 5 volts leg 1 and the same with the 2nd leg with neutral on the green, remember this what works on 1 set of equipment may never work on the next set you place it on
I watch these videos even though I don't have the slightest clue about what it is or what anything on it does. Make more!
The layout of PCB boards, heatsinks, mains transformer in this power supply is very similar to GW Instek GPD-3303S. Even the chassis is the same type. What a bummer!
I've got yesterday (5/2024) the same model the X-E and the terminals distance are not ok.
After about 3 years of work my SPD3303 finally started rebooting itself randomly. You are flashing/programming something and in the middle of the process PS reboots making the unit that is being programmed a brick... I would like to expect for PS to work much more than 3 years..
So since the turn is shorted does this mean its not truly isolated as advertised?..I literally bought this so i could safely use the oscope on it....
I just wanted to scream about the Analog Devices ICs there but the next moment you just mentioned it :D
Those insulators don't break the shorted turn. One would need to be behind the bolt head to break the circuit, not between the transformer and the mounting flange.
Also no way they're running Linux on the STM32F207VE with its 512k of flash and 128k of SRAM. This is an M3 microcontroller, not a big ARM SoC.
+ollopa1 Dave said that he could see an insulating washer under the bolt. I couldn't see it but my eyes have already seen their best days.
+ollopa1
Maybe it's a chopped up version of Linux?
+Benjamin “Ozias” Esposti It's not running Linux.
ollopa1
Okay if you say so :P
actually there IS linux kernel (uCLinux) for Cortex-M3 chips and it may run on STM32, but still it requires lots of program and data memory, can't run on standalone STM32.
What is it about the constant resistance mode on the load that makes the supply want to kill itself?
Just pointing out that it's not Linux or any "high level" OS running on the STM microcontroller. It hasn't got the memory, nor the processing speed; it's a Cortex-M3. It might do the display rendering (drawing fonts and such), but there might be another actual controller. As for the JTAG header, the STM also supports JTAG-SWD, so it might be using the 20 pin connector, but 3 pins would be enough too:)
Are 110V with 120V and 220V with 230V really that matter? my house mains voltage fluctuates between 215V and 230V.
The mains input board was missing a screw! It was even labeled to have one!
thank you david from david
Hi Dave. Can you PLEASE REVIEW QUALITY measuring and power supply devices!!!!????? What's with all this one hung low junk???
Really Informative
My Siglent power supply transformer (got two- the one is S model the other is with one less digit resolution on the display. I thing it is the D model) went buzzing horribly after 5 times use ! It is an fairly expensive 3303S of more then $350.
Can you combine the channels in parallel to get a 6A output on this safely?
I am looking for a minimum of 5A capable power supply, around a 500 usd budget.
street price... i've seen a lot of people trying to sell me something on the street, but usually nothing with a half life as long as a bench power supply. also holy shit Dave figured out what a spudger is! :D it looks like at the right load the life of the psu is limited to how many times the relay can trigger, which is sad because if it is linux like you said... they could have detected that, had it pick one or the other then pop up one of those warning boxes to tell the user you arnt getting quite what was requested for xyz reason
Hey Dave
nice video. Can you do a video on the differences of the different Capacitor Brands? You always tell that one brand is the best but why and can u prove it ;)
Greets from Germany
Reply to an old post... Capacitor brand is not as much importance as the SERIES of capacitor. There are cheap and nasty Rubycon models, and there are good quality Rubycon. Same for Chemicon and Nichicon,w ho also make very high quality and also make low cost short-life models. Same for Lelon, and even for brands like Capxon who DO have good quality capacitors in their ranges. There are many many different types within every brand, each with various characteristics and compromises.
The main thing about the brand is "reputation" rather than anything else - this is more about personal bias, as well as knowledge of whether rated specs (eg: Lifetime) will be met.... those things cannot be tested or proven.
A good analogy is for cars - is an Audi a "better" car than a BMW or a Ford? Which is the "best" brand of vehicle? So that is the type of question that you are asking about Capacitor brands... nobody can answer that.
This ist an STM32F2, an Cortex-M3 i think. Nothing that could run a linux, maybe some low-end realtime OS like FreeRTOS.
+Torben Hellige heard of ucLinux?
Lelon capacitors are okay-ish i would say.. somewhere between samwha and teapo. Definatelly not at one hung low capxon or chengx levels
I don't understand how it's physical possible to be smart enough to design/build a precision power supply and fuck up the FRONT PANEL POWER CONNECTORS!
+ElectricGears i think, they don´t *design* it, they just copied an already existing thing, like that on this little inboxed link, in this video....and made some changes due to competition...and off they go....it´s like as the audience already said...YOLO...
I would rather go for : RipOff or Fast money makers....
Dave made a good video, but from my point of view (as it would be *my* money as well) This thing is a true RipOff!!
Design origin is well in the end of the last century made up with a nice DAC and a newer µC and there you go....
My BOM would be: 40 for the toroid, extra 20 for these Control ReDesign, 50 for all semicon, 30 for PCBs and mounting, 20 for case, another 20 for buildup and test....rest is true : YOLO....
The "precision" relais only on and whithin this ADC, all the rest is "howYaDoin" no excuses here....
+ElectricGears
BTW, the EE's don't usually do the case design or parts sourcing, and in the case of the caps, the engineer might have used good caps, but the person who sourced the parts used the cheapest ones there are...
The is a thing called "white Booke" in where all the specs are nailed into....and if i´ve chosen a specific component to be a needed one, i usually wrote it into as well, just to be save that this thing would not be repalced by a cheaper one....;) We EE desingers know that as well ;)
TubiCal
Yeah, unfortunately it seems that not all EE's do that. Either that, or they are bad at picking good parts! O.o
ElectricGears because proper bananajack connections would add 30-40 cents to BOM which means less profits.
You always criticize if a product has other caps then from a bunch of vendors you prefer. Would be nice if you could make a video about that, maybe solder different caps of different vendors to a single board and test/abuse them under the same conditions.
+foamidable no. that`s NOT how it works .
+foamidable
Electrolytic caps are usually the first thing to fail and the whole thing stops working because of 1 failed cap so a poor choice of cap could potentially damage the company's reputation in terms of quality. In a very cheap device where every cent added to the BOM cost makes a big difference, that might be OK; but in something $500+, it should be worth spending the extra few cents to extend the MTBF.
I think to really test between different caps might mean putting many caps from different batches and different brands under a constant AC load in an oven for a year or more just to see which fails first.
+foamidable if you design some critical ESD/SMPS things, you get to know good/ok/NoGo caps...trust me....
He´s in fact all right and well in the industry standarts while telling that these caps are the caps to go for....
It´s all within reliability, low ESR over time/temerature and aging....and as well these things do not explode suddenly, out of the blue!!!
Cap failure takes years. Dont know if possible to accelerate such aging/heating to parallel real-world accurately.
davecc0000 of course there is a way to accerlerate this. We had an "climatron" oven where one chose between -30 and +180 gedree celius and 10% up to 95% humidity...there i left my protos for let say a week or alike ramp it up and down.
And if you like to see what´s a "WonHuanLo" branded cap is doing, simpy check these Flatscreen forums or the videos covering the repair of them, usually it´s these caps which causing the unit to fial...usually right after the waranty is over....
Its been 5 years since this review.. does anyone know if there has been any revisions to this power supply that fixed some of the issues such as the banana plug spacing, or display ?
The banana jacks are more snug now but they have not changed the distance between them, except on newer models (SPD1000X family, for example) .
Dave, from the picture the bolt through the toroidal transformer unless it's made of plastic (doesn't seem so) IT IS CONNECTING through the chassis, so there seems to be a shorted turn there!
+Kris TheTrader Not if it has an insulated washer, which it does appear to have.
+EEVblog How can a washer break the loop? To me it looks like if you cracked the threadlock it's connected. I couldn't let it go and lost attention after that. On the outside of the bracket where the nut is?
+Brek Martin Same thought over here... I guess we will never know now... :-)
@@BrekMartin - It's VERY simple... the washer electrically insulates the bolt from the metal. Think about how you connect a power transistor to a heatsink.... there is an insulating washer so that the bolt doesn't electrically connect the case and the metal tab of the device.
The washer is clear plastic, and has a shoulder than fits into the hole in the sandwich plates. There is no electrical connection between the bolt and the 2 side plates. Dave has already explained that there is washers, both in the video and in the comment... why can't you comprehends such a simple thing?
@@johncoops6897Brain damage, and a poor attitude probably.
Whats the minimum voltage that you can set? Are there offset of many mV ?
I agree with your fear of shorted turns on toroids, but on a hefty transformer like this I would expect the bolt to melt the first time it was turned on, so there has to be an insulator somewhere.
BTW, I would have been interested in buying one until after I saw your review. The banana sockets would be the biggest downer. Pity, it looks quite good otherwise. Imagine, if they invested some $5 more they would have a really good piece of gear. instead they have something that I wouldn't buy for half the price.
Hy i have an sorensen dcs 50-40m16 power supply. can you explain to me how the voltage is regulated automatic? i believe it measure the load impedance and it multiplied by select current to determine the output voltage.
Not standard dual banana distance is a deal breaker, what the?
Hi... I love watching your vids... they are very informative and knowledgable but I would like to point out a minor point if I may.... sorry to be a nit-picker but to clarify, the metal edge mentioned at around 9:13 actually looks like a guillotine cut.... laser cuts melt to cut and therefore seldom leave a raw cutting edge.... guillotine cuts on the otherhand, do leave very sharp edges capable of cutting.... In this video, I agree with you completely.... nice review... sorry for the nit-picking....
Agreed - it's definitely a guillo cut. Anyone who's assembled a cheap PC Enclosure will know how razor sharp they are. Running the mains lead bundled with data cables is bad engineering, but to also not have them sheathed and scraping on the chassis is really poor form.
Note that a comment above from "rumblfmp" mentions about year 2000 they have separated the cables and added a plastic sheath, as well as numerous other improvements.
That's punched sheet metal that leaves a burr on one edge. One is supposed to run a deburrer down the cut edges but it's often neglected. Also I've seen some lovely colour lcd drivers for the STM32 that wouldn't need any fancy OS. I guess they're probably only running a basic RTOS in that thing. Bit worried about all that clicking though.
Two noob questions:
1) So linear power supply is a good thing... Why? (I thought switching ones were the best thing since sliced bread since it wastes less energy, less heat etc..)
2) And what's the point of supplying power so precise down to single digit milliamps?
Nobody replied, so I will try to cover at least some issues (some 5 years later):
1. Linear power supplies are heavier and have some other limitations, however the power output is CLEAN. There is no ripple or electrical noise from the switching operation. Ripple on the power input can really upset sensitive electronics, and cause misdiagnosis (eg: where is that harmonic frequency coming from?).
2. The ability to regulate power *accurately* is important for troubleshooting and designing. It becomes more important the lower the power requirements of the connected device. 1mA is irrelevant to a 12V50W light bulb, however it is vitally important for a SMD LED that is designed to operate at 2mA maximum.
3. It's not just the precision, but also the ACCURACY, the resolution drift, the stability and the repeatability of Voltage and Current measurements. It's no point having 1mV precision if the accuracy is +/-5mV
4. Generally a Linear power supply is ALWAYS considered better than a Switching power supply. However they cost more and are large and heavy. You get better "bang for bucks" from a Switching power supply, but they are always an inferior solution. That said, for the same $$ you will probably get better features and raw "on-paper" performance from a Switching type power supply.
WOW, 100C on the outside case of that transistor?
I know transistors can handle that, but I'd rather see it at a lower temp than 100C ... maybe like 70C or so.
Have the binding posts been fixed on the latest production?
why the power supply oscillates between CC and CV with an one ohm load?
Is there any power supply you recommend? I'm in the market and thought this might be a good choice, but I guess not.
At 27:40 ish, i'd expect it to run cooler with the cover on... The only thing i really dont like is those banana contacts!
I've seen cat 6 fail completely due to a centimeter or two of untwisted pair where the installation tech has unwound it to make it easier to punch down. A long run of untwisted pairs, inside a high-emf 50.60hz environment, surprises the pants off me. I'm guessing it's a pretty slow connection.
so siglent watched this and made all the UI changes dave wanted about 1 month after this video was released... it now displays ouput and set voltage at all times etc
Seems so. Search for a comment by "rumblfmp" (around year 2000, perhaps 2 years ago) who describes the other improvements.
Every time dave makes a power supply oscillate an engineer gets their degree.
Siglent YOLO! Power Supply.
+Gabriel Fuentes LOL
have you done a teardown on owon odp3032 power supply ? I searched but maybe I missed the keyword, if not please do! :)
What a Siglent fail, thanks. I got the same crapping banana plugs on the cheaply switch mode variable supplies. I had to make some brass extenders/adapters to screw on the terminals and accept the full length of a standard banana plug.
I have had toroids HUM, for certain!