I'm passionate about electronics, hopefully soon you will be too!
My videos tend to focus on power electronics (the best type of electronics), and my goal is to get as many people as possible excited to learn about this fascinating subject through fun analogies, demonstrations and stories! Don't be afraid to ask questions in the comments, the only thing I love more than answering questions is asking them myself ;)
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I found your channel just a few hours ago but I'm sure I'll watch all your videos starting with the first. I love your style and your clear and logical approach. 😊😊❤❤
Good video!!!!
Shit explanation
3:24 more importantly, to circuitry 😂
Easily understandable even for people with little or no knowledge in electronics, yet highly professional. 😊😊❤❤
Thank you very much
Uh, what's driving the gate of Q1? 🤕
An extremely interesting video. I assume that if one is going to repurpose the power supply unit for hobby work, or maybe to drive a raspberry pi or for some other purpose, it would be possible to adjust the voltage using the potentiometer you mentioned towards the end. But how much voltage variation can you really get in practice and is there any consequence (for instance more heat being generated, or a shorter component lifetime)?
Not much sadly. Maybe +-10%? They’re there just to “trim” the output to the value needed. Might affect efficiency slightly but it will be designed to run within the range of that pot. You could swap the pot or surrounding resistors to get a greater range but then the controller might get upset
No your fingers don’t count - love it!
Your the first person who has explained vrm's where a amateur can really understand them. Thanks you are an amazing teacher, really appreciate the time you have spent on these videos.
Thanks!
Thanks for sharing, awesome!
Hmm somehow it looks like you playback yourself :P, but great video!
What about the control circuit back to the Gate of the MosFET?
Sorry but my experience is that small switching transformers/battery chargers are not isolated. Allegedly "a tiny cap btw primary and secondary side". I have measured 175V AC with oscilloscope btw minus and Gnd on a Mascot 12V charger, similar in USB chargers. (But nothing with multimeter) This creates annoying 50 Hz noise in battery operated recording equipment on charger.
Brilliant top level explanation!
"This is actually quite dangerous - not only to people, but more importantly to circuitry" 🤣
Super, thank you for this educational material.
I recognize that green bucket. Got mine as part of the Halfords car wash kit.
Yep! Same here 😂😂
It does my heart good to see a bright young person explaining electronics so well. I started studying electronics since 1983 or so. Yes - we have come a long way.
yes please more videos on smps. Diagnose and repair of common problems. Would like to see a list of common symptoms and their causes and solutions. Great presentation, Thanks
Did you make it? Is the shunt too small? (0.5w at 10A)
I never ended up making it sadly. I think there were several problems! But I will be making things soon as I now have more time
The way you started with the most fundamental components in your schematic and built up the complexity was simply genius!! What a clever way to go about it. As somebody who spends a lot of time drawing electrical schematics myself, i can tell you put in a lot of work just into the drawing itself (and obviously into the rest of the video as well). What an amazing video overall. Instant sub. Please keep up the great work.
Thank you very much!
I would like to see a video of fixing switched mode power supplies. I have a surround system and the system has failed and I cant afford a new one as I have retired. I have an electronics background but switched mode has me stumped.
That was the best description of a switched mode supply I’ve encountered. Nice one!
Lightning to BNC? Can't say I have one of those in my collection. 🙂
Thank you for a very interesting and informative lesson.
Your videos are great brother.
How about a flyback transformer? I got excited when I saw the FULL BRIDGE RECTIFIER!
Extremely well done. Hurrah!
Great video, well explained. But - "dangerous to people, but more importantly to circuitry". As a rule of thumb, circuitry becomes redundant when your dead, so maybe "... and also to circuitry" ! Just a thought ! Looking forward to the tiny GaN PSU and PWM videos.
Excellent presentation! I now understand SMPS far better than I ever did. By the way how does the SMPS do the PWM? How is it possible to control the PWM with the MOSFET? Why is no crystal is needed to adjust the frequency? Also why is only 1 diode used instead of a full wave rectifier? Just economics?
"annoying EMC regulations"...I was impressed until you said this.
Also, I love that property of inductors, it's ridiculous. Inductors are like flywheels. A flywheel wants to keep its momentum going and REALLY doesn't like changing it. In electronics everything is a conductor given enough voltage. Even an open circuit isn't really open, a few thousand volts could "close" it again. For a flywheel, interrupting a circuit is like introducing a lot of static friction: something that is hard to initially get moving. The flywheel either kicks the mechanism really hard until it moves or annihilates the gears. Unless the elasticity of the material eats the entire momentum like a champ, could also happen. For a charged inductor, removing from the contact creates an air isolated gap. However, the current is still flowing. But the charges cannot go anywhere in an open circuit, so the open ends get charged until a breakdown happens. And that's the most absurd part. An open circuit with a charged inductor is just a piece of wire with a flowing current. Not charge, or voltage, but current.
I sat through watching the circuit building up for 20 minutes and I feel I could watch it for another 20 minutes as I've never got lost anywhere. That is one impressively easy and coherent explanation.
I've been absorbed in this video like the EMI in the filtering circuits of the SMPS. Such a well made explanation video of something very crucial in electronics. As an electric engineer I'm well known with the principals, but this is explained in a way i can even show it to non engineers and make them understand why things are constructed the way they are. The buckets and spilling are gold (or platinum to stay on topic) in this. If there is a way of making people exited for a matter, this is the way. Keep up the good work!
Thank you very much!!
Excellent resource, thanks.
Annoying EMC regulations? Those were introduced by technicians that looked for interference solutions so that you can watch TV and have the washing machine running at the same time. I wouldn't call that annoying 🙂
One aspect of almost every higher power SMPS I have ever taken apart (usually in the range of a few hundred watts up to 1 kilowatt, from computers) is that they tend to use Schottky diodes of the "dual anode, common cathode" type on the low voltage DC side. I understand why Schottky diodes would be used at this kind of power range - they have a significantly lower forward voltage drop, so waste less power as heat and are therefore more efficient. But what is the advantage of using the "dual anode, common cathode" type in this application?
Great content,👍🏽👏🏽👏🏽
I love videos like this - I feel like I am in a class.
Just found your Chanel where have you been 😂 very informative content loved it 👍 can i ask you to do some videos about inverters so called (Grid tied invertes) how do they sync with the grid frequency....ty
At 10:15 Awesome job with the buckets example! I liked how you layered the two. Beautifully done.
I did hit the like button, and I liked it, even though I criticized it, and I think you can do better by showing the inputs and outputs of each stage and adding in the extra parts. And by showing an easy way to determine whether such a load is isolated, or not.
This video is somewhat non-educational, and the comments below that praise it are insane. At 12 minutes I am convinced that the producer does not know the equipment is non-isolated. Then he claims that the rectifier is part of the input circuit and is directly connected to the AC power line. That would be an example of a device that is not isolated by using an isolation transformer. He shows a schematic that omits the AC input plug and the input transformer. Then he points at what looks like the isolation transformer (input) and claims that it is an inductor. I think he is confused, but I need to look closer to say for sure. Then he shows the schematic showing a transformer used for coupling to the load and calls it an inductor. I contend that it is a transformer used for "coupling" to the next stage. Here we have isolation between the middle stage and the output stage. This does not mean that the whole device is isolated. The input is non-isolated from the AC power line. as far as I know. Then he adds some warped opinions. Here he does a good job at explaining what all the extra parts do while suggesting that "improvements" in the technology can be derived by taking out features that may or may not be needed. Much of those improvements are enabled because laws changed making it legal to induce electrostatic pollution into all physical objects with technocratic exceptions to protect silly con valley. Many examples exist. The older "switching power supply" that he uses may have been designed for a wider array of purposes. That type of power supply, (switching power supply) is designed for a purpose of not wasting energy while not being used, or fully used. (not like a zener diode circuit) As a load develops it conducts and cuts off as the output load changes. It would also need good frequency response. What would happen if the MOSFET burned as a short, or the rectifier burns and becomes a short? Some of those extra parts might be needed to turn a potential fire into a simple failure. I do not feel like the devices were "fully explained." Non-isolated electronic devices should be a concern based on the fact that we now have many, where once there were few. If a sturdy, high voltage, high current rectifier, or CFL ballast, burns out because of a voltage spike then it could become a red hot burning glob of sticky plastic and metal that falls out of a fixture or leaks out of a power supply and tries to ignite something. The latest modern gear seems to have better boxes for power supplies. Light bulbs that replace the now illegal light bulbs (incandescent) typically have 2 power ratings written on the bulbs. That is because they are NON-ISOLATED. And because the energy used to make light in the final stage is slightly lower than the total energy used. Some of that energy is out of phase and/or out of synchronization. That energy is dissipated in the AC conductors, and other parts, as a small amount of heat and some weak oscillations. I could be wrong, but I doubt it. All electronics that are not isolated by a power transformer that provides isolation from AC power systems will probably affect the power system"s parameters is some way, many of which could be negligible. The parameters might include voltage, current, phase angle, phase, frequency, physical vibration, polarity of voltage, power factors and meter readings. Thanks for trying to explain it to me. I will have to dissect one, unless there is an easier way.
In the first 7 minutes, I don't like the video. I will watch the whole thing anyway, probably. He seems to be absolutely wrong about ISOLATION. And in the 21st century we see a lot of devices that are not isolated by a transformer from the AC power system. I am wary of that practice, and some internet sources do brag about how they can use non-isolated electronics to trick power meters. Examples: CFL light bulbs. LED light bulbs. Power supply modules that look the same as the one in the video. I also disagree about what "isolated" means in this context. Isolating equipment of this sort is about separating the internal circuits from the AC input. This not only protects the equipment being powered, but also protects the AC system from interference and irrational phase shifting. Other switching power supplies were designed in the past for facilities other than residences where it could be less important. The headline promises to explain all of the components. I was hoping for a theory of operation. I expect to be disappointed, but I will take a look.
Wow, keep it up please. I've only watched this one video but I'll certainly be watching the rest if they are anything like as concise and interesting as this one.
Love the spring analogy.
Wow! This is concise and easy to follow, I learned something today!
Grate, keep it simple.
Thank you very much , it was very easy to understand .
Great explanation! I wanted to make one for myself for a custom project and now I know a lot more