That Y2 safety capacitor is there as a return path for the switching noise coupled across the transformer through the interwinding capacitance. Without it the output side will just behave like a large antenna
@Graham_Langley
3 жыл бұрын
I'd add that although there's no earth on the primary side it's still 'earthy' so the Y2 cap couples the secondary side to earth at high frequencies. Problem is as Julian says it also 'leaks' some current from the mains to the secondary and it's omitted where this would cause a problem or when the secondary is coupled to earth by some other means. Also where several such 'leaky' devices are commoned together the resulting combined leakage current can become a hazard. An example is a TV distribution system - here it's simple enough to deal with by bonding to earth.
@JulianIlett
3 жыл бұрын
Thanks chaps - I am now more educated :)
@kingsman428
3 жыл бұрын
@SDG Electronics. Thanks for that useful insight.
@Graham_Langley
3 жыл бұрын
@@JulianIlett You're welcome.
@ethanpschwartz
3 жыл бұрын
Hi, I'm here from the future and Julian's PostBarrell is my favorite series on KZitem. Robo-Julian's PostBunker just never captured the same magic.
@JulianIlett
3 жыл бұрын
I've got an idea for PostBath - meh, maybe not ;)
@followthetrawler
3 жыл бұрын
Julian did you consider just using an ATX power supply for the vocoder project, I think it provides all the voltages you need and usually at quite high currents. Might even be cheaper than buying multiple power supply modules. They are generally very well designed and manufactured.
@dedr4m
3 жыл бұрын
Around the 30:00 area of the video: I've managed to get some PSUs designed for 250V mains to start-up at as low as 15V... The PSU is a MeanWell GS25A05-P1J that usually starts at 18V and some even as low as 15V and of course all the way up to 250V (or rather 300V-DC).... The ones that do this are from a decade ago.... so newer revisions may not start so low.... But it does make a good set of 5v sources running off a 20V 100W solar panel in a pinch. Just note though the bridge rectifier and input filters get uncomfortably hot at such low voltages.
@fiskurtjorn7530
3 жыл бұрын
For a brief moment, with the couch, I felt like watching an Ashens video.
@Mike_Downey
3 жыл бұрын
I thought the same thing! Since Ashens and BigClive know each other, perhaps it's time for an Ashens/Julian crossover now.
@BoHolbo
3 жыл бұрын
Naah.. That couch is way to nice looking. It doesn’t even seem to have any rips in its cushions! 😄
@noweare1
3 жыл бұрын
Good video, useful, thanks
@IanSlothieRolfe
3 жыл бұрын
The capacitor between primary and secondary is to provide RF switching noise on the secondary a path back to "ground" (i.e. neutral) which reduces the tendency of the DC power lines to radiate it like aerials. The tingling sensation is an unfortunate side-affect.
@sdgelectronics
3 жыл бұрын
Not to neutral, just to the same node the switching noise is generated from.
@IanSlothieRolfe
3 жыл бұрын
@@sdgelectronics Ah yes that makes more sense.
@DuroLabs85
3 жыл бұрын
I have a 240v-12V 2A Power Supply which turns on at 12V in INPUT and it delivers 12V 600mA at OUTPUT it is a transistor based SMPS it works nicely :-)
@douro20
3 жыл бұрын
Isn't an STM32 a bit overkill for that USB-PD trigger application? BTW the heat sink on that boost converter has the wrong tape on it...
@williamsquires3070
3 жыл бұрын
It’s like, “Oh, Julian has already figured out that’s today’s Postbag is already cheap Chinesium crap and tossed it right where it needs to go. This is going to be a short video!” 🤣
@kingsman428
3 жыл бұрын
*"...Chinesium crap..."* That's up there with the 1970s saying *"...Jap crap..."* which is complete piffle.
@ches74
3 жыл бұрын
Why not buy your Chinesium from AliExpress? Same stuff cheaper and usually arrives quickly. Might those large copper areas on PCB for the vacuum cleaner battery not be for heat sinking? No doubt you'll find a workaround.
@DavidBTB
3 жыл бұрын
Can you daisy-chain power delivery devices to expand capacity? Time to make some custom cables and wait for the smoke.
@capecoaster69
3 жыл бұрын
Always doing something awesome!
@Nanocosm
3 жыл бұрын
The capacitor across primary and secondary sides of the smps is for EMI suppression
@deslomeslager
3 жыл бұрын
You can run your Antminer PSU from your solar panels, if you have over 100 Volts (3 panels might work, but I think you need 4). I have a few of the PSU's spare, so IN THE EVENT of a power outage I can use my solar panels to create 12 Volt (with the HP / Antminer PSU) attached to a simple inverter to create mains manually (ni batteries involved). I do can keep my freezer running and such. You should give this a try! Self sustaining for in times of problems (and if the sun shines, but you already have many batteries as a backup).
@JulianIlett
3 жыл бұрын
Maybe in summer. Right now, at midday, the 240W panel is producing 5 to 10W. To keep the workshop warm, I'm running 3 miners (about 3kW).
@pinterelectric
3 жыл бұрын
Julian word of the day, coulometric
@piconano
3 жыл бұрын
I really like the one designed around the FP5139 chip (@12:30) I like the PCB layout. Specially how the Caps are all spaced apart and not close to a baking transistor. The USB connector will have to go. Such a dumb design! I've seen those caps before. I have one and tested it last year. The ESR was 50m Ohms. Excellent for the 2200uF size. But, they are NOT cheap. I would replace them with low ESR name brand like Nichicon or Rubycon from Digikey or Mouser. Low ESR ones are not cheap. About $3-$5 each! That's if you want to keep it for a long time, and if you care about ripple or not. This was a great video. I love SMPS and LEDs.
@Roy_Tellason
3 жыл бұрын
On that balancing board for the vacuum battery, it's apparent to me that they're using those large copper areas on the bottom of the board as heatsinks. I see a cluster of thermal vias near the center of each one. Rather than cutting up the board, why not trim out the unused bits of plastic in the battery holders? That would seem to give you enough room...
@IanSlothieRolfe
3 жыл бұрын
That battery balancer has tracks running v close to the edge of the board...
@DAVIDGREGORYKERR
3 жыл бұрын
I suppose the connection you made are temporary would need to be soldered properly to take a heavy current.
@gregorythomas333
3 жыл бұрын
@7:43 Underneath the chart the description for IP5328 states that the USB-C in bidirectional. Break off the end of the razor blade to get a nice sharp point on it again. In Julian's Shorts...it did work but it didn't last too long (I feel ya bro)
@piconano
3 жыл бұрын
For a good quality power supply, buy the recycled laptop chargers. They sell them with out enclosures and the wires just snipped off from their previous life! Replace the capacitors, and Bob's maybe your uncle. You can easily tweak the output voltage with a resistor change. But they are generally very safe designs and low EMI and safer than these cheap-ass Chinisiums. They were once certified products. I bought one for $5 from Ali Express, and when they are gone, they are gone. Went back to buy more, but Nada. They do come up frequently though.
@eDoc2020
3 жыл бұрын
Or find used laptop adapters in person and then you get the case, too.
@piconano
3 жыл бұрын
@@eDoc2020 $5 delivered? Where?
@eDoc2020
3 жыл бұрын
@@piconano I said locally. Yardsales and such, maybe Craigslist or similar. If there's a computer recycler or collection center nearby you could try asking them, too.
@piconano
3 жыл бұрын
@@eDoc2020 You are telling me things that everyone knows! Be gone.
@melkiorwiseman5234
3 жыл бұрын
The original phrase is "The proof of the pudding is in the baking" but like many distorted sayings, the original seems to have been forgotten. And Hi Julian! Nice to have another video from you. :)
@melkiorwiseman5234
3 жыл бұрын
Just adding, if you have a voltage booster which can go down to 2V at the input, you might be better off putting all the supercaps in parallel instead of series since you'll get a greater capacity that way.
@SpeccyMan
3 жыл бұрын
If you're going to make such a claim about a saying that dates back to the 14th century, could you at least provide some evidence? Not all puddings are baked, some can be steamed!
@melkiorwiseman5234
3 жыл бұрын
@@SpeccyMan What is this? A cooking show? Do your own research, Mr Pudding! :D PS: I adore steamed golden syrup dumpling.
@mikebarrett2621
3 жыл бұрын
@@melkiorwiseman5234 In any technical dissertation it is customary to quote your sources (not sauces).
@eDoc2020
3 жыл бұрын
Well here we just say "The proof is in the pudding" which is, as you say, distorted.
@manuelgarcia-ds8wy
3 жыл бұрын
I love when you open the mailbags, i want to stay in your home, is interesting the items
@alexstone691
3 жыл бұрын
What happends if you plug the charging port into the boost converter ? Does it just waste power?
@jangondrie4338
3 жыл бұрын
Again a very interesting video: thanks. Q: where to buy these 18560 connectors?? regards, Jan ( Netherlands)
@JulianIlett
3 жыл бұрын
Watch my Vruzend video :)
@lingcod91
3 жыл бұрын
When I go to Ebay all I see is high priced retail stuff. What's the site you use ?
@fredflintstone1
3 жыл бұрын
so good it is back your post bin :-)
@DIYwithBatteries
3 жыл бұрын
Always with cool stuff 🤪👍
@akhurash
3 жыл бұрын
What kind of currents does the Vocoder project require?
@Mark1024MAK
3 жыл бұрын
Raisins?
@JulianIlett
3 жыл бұрын
It's looking like about 2 amps
@lalortech5286
3 жыл бұрын
Hi Julian, why not use an old pc power supply for your vocoder project, as it has various power rails as outputs, it is better than all these different PS u are trying to use. What say you?
@JulianIlett
3 жыл бұрын
The -12V does not have enough current :(
@dglcomputers1498
3 жыл бұрын
@@JulianIlett Maybe get a damaged mixer but with a good power supply, should generally have +/- 15V available which can be reduced as necessary, plus you will be getting a PSU designed for audio use. You could probably pick an older Behringer up for cheap and just use it's PSU.
@SidneyCritic
3 жыл бұрын
Do you have the official video driver on your PC/laptop. I think the drop-down menu doesn't show if you run a generic Win driver.
@fredflintstone1
3 жыл бұрын
I am suprised you do not have a load of USB converter/adapter? like type A too C, micro etc.
@JulianIlett
3 жыл бұрын
What I need is a type C to type C - I've ordered one. But if I make one out of cables and adapters, will it have all the necessary signals to do PD?
@fredflintstone1
3 жыл бұрын
@@JulianIlett I don't know be fun finding out :-)
@premnandpal7371
3 жыл бұрын
spot welding mechine under $10
@premnandpal7371
3 жыл бұрын
diy
@David_11111
3 жыл бұрын
where is the best place to buy an 18650 set up like yours ? Please
@JulianIlett
3 жыл бұрын
I got all the 18650 cells cheap when a local DIY store sold off all their spare batteries for £1 each :)
@stevemarriott2023
3 жыл бұрын
why dont you just balance your hoover battery with the smart charger kzitem.info/news/bejne/lH2LvGmgemKVjKg iSDT SC-608 Smart Balance Charger
@ImaginaPower
3 жыл бұрын
Why not buy a bms with balancer cheaper from aliexpress Julian?
@David_11111
3 жыл бұрын
yay
@mattwood2207
3 жыл бұрын
7 adverts... Wtf
@Mark1024MAK
3 жыл бұрын
I had more than that!
@JulianIlett
3 жыл бұрын
I've got mouths to feed :)
@kingsman428
3 жыл бұрын
@@JulianIlett I read that as *"... I've got moths to feed..."* but even worse, I then thought to myself _Wow, how many moths has he got_ 🙄 I'll see myself out
@fredflintstone1
3 жыл бұрын
Class Y are there to To suppress the high frequency on common mode PSU
@ImaginaPower
3 жыл бұрын
and why even bother to pay more to the drop shippers of ebay when you can buy much cheaper directly from aliexpress?
@MrRelevance02
Жыл бұрын
I'm sorry, but. Ive been watching way too long n that thumbnail is just sad.
@Simon-nc6gq
3 жыл бұрын
Ads. Lots of ads. Not watching any more.
@Mark1024MAK
3 жыл бұрын
A ridiculous number of ads, more than one per item that you opened, all spaced throughout the video 🙁
@David_11111
3 жыл бұрын
Sent you a message on facebook :)
@JulianIlett
3 жыл бұрын
Ah yes, I do know Tim. Is he your neighbour in Sweden?
@David_11111
3 жыл бұрын
@@JulianIlett lol no but I have been there with him :) he is there Now, Mike is close by too.. :)
@David_11111
3 жыл бұрын
@@JulianIlett I live very close to him in UK .. we do similar things with PICs
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