Use a tantalum capacitor in the LC filter and you will get much better filtering

Also keep in mind esp32 very power hungry fo battery based projects.

There are legitimate downsides to the ESP32 not mentioned. It's terribly inaccurate for analog read (especially when WiFi/Bluetooth is running), draws 3-10 times the power than other modern microcontrollers, its PWM is software emulated so it's unusable if you need precise and accurate PWM. Just some things to be careful about because some of these are dealbreakers for some projects.

Good video and nice presentation with demos. I recommend Arthur Kay's book about Op Amp Noise for practical engineers. However, I think we miss a very important part of op amp topic, which is the modeling of the op amp. Think about modeling of the noise sources, CMRR, PSRR, slew rate, input impedance, and output impedance.

I am surprised , only LC circuit can bring so much changes in EMI ? What is the use of pi-filter ?

Fantastic video!

Just finished this series. Thank you for the lessons and inspiration. I always wondered about the whole Pcb process and now I know.

yeah ok, but there are no holes for the pins connectors !

Please consider doing a follow up on charging battery banks, like 2S 2P battery banks for example.

Everything thing about op-amps is mathematics related, its invention by design was for a analog computers part #741, so the first topic out the door is DC again and DC feedback, advance topics are AC parameters this is where we enter the upside down world TYPE-1,2 and 3 compensators and beyond.

HI Robert, I am currently working on projects involving the design of electronic circuits for Atex products. Would it be possible for you to create a video addressing this specific topic? I am confident that your expertise would be of great help to me and others in the field.

Thanks a lot for your superb content ! A relatively "consumerish" question ... Since a battery is specified in terms of its charge / discharge cycles, suppose we keep the appliance (eg. laptop) powered continuously by the charger, would it prolong the battery life. I assume that a laptop would draw power from the charger and not from the battery, hence seldom discharging the battery.

Did someone mean Atmel/atmega?

OPA928 is a competative of the long out-standing ADA4530-1, which appeared roughly in 2016. And TI even made it pin to pin compatible to ADA4530-1, with the same guard ring structure.

A lot of useful information in this video Robert. Must watch before dealing with op amps. I'm just in the process for selecting proper op amps for my electronic load(i think i'm choosing opa189).

I'd say hippies built hippie computers. Long haired computers.

2 bucks for 5 pcbs is still wild

Don't forget RTOS, more pwms, dual core. But then again i use both Arduino for simple things and Esp for something more with RTOS to utilise it maximally. For exmaple i use arduino to automatically drive my shutters but esp i turned ito flight controller

Take any STM32 board, take ESP, take the new RISC-V based board - all of them are orders of magnitude more powerful than Arduino in all possible measuremenet points, and most of them are also cheaper.

Wires fr

People obsess over the esp32 clock speeds, when was the last time you maxed out your arduinos clock speed? I build engine management systems with arduino and still have not maxed it out yet. Arduino is older technology, it's now expensive and and there are newer, more advanced controllers to move on to. I wouldn't even consider starting with arduino now, start with raspberry pi pico or esp32. Arduino has almost disappeared here in Japan, it's the 3.3V logic when your old designs use 5v that is the annoying bit.

Good luck flexing with its documentation, driver support and all these chinese **** that comes with it, not even mentioning security implications. I recommend everyone spend more money and purchase something real instead, you will thank yourself later

I work in Huaqianbei, the biggest electronics hub in the world, I can help you find new original components

Is there any type of filtering required to reduce noise/ EMI/EMC. I have designed a microcontroller board based on atmega128A, it has many other IC's. its working perfectly. But little problem of Noise/EMI/EMC. it has a small AC motor operated through a relay. switching of motor sometimes freeze RTC and get garbage on LCD. Is it possible for you to review my PCB ?

When using one single 18650 battery to power an esp32 project at 3.3V through an HT7833 LDO, how should input and output capacitors?

what about usb fast charging and data transfer on the same port

I also disagree, connecting (REMOTE ACCESS), is better as an option. (REMOTE access "can' be a backdoor to malicious morons).

That's some high quality content and perfect to complement my reading of Chapter 4 of Art of Electronics

BRat moj mogao si malo bolje taj Engleski nauciti kad si vec tamo otisao!

Thank you! This was a very helpful introduction.

Been developing a PCB that is basically a compilation of others, which have a ferrite resistor. Monkey see, monkey can do. Now I understand what it's for. Thanks to Robert & Eric, this ape descendant has a better understanding of what I'm doing and why.

Oh, so I bought it, you know

So shortly: Lenght matching eliminates ringing. Changing stack-up moves impedance closer to 50 Ohm. Resistor is decreasing difference when impedance changes between buffer and track.☝️ And its only problem, when lenght is close to wavelenght of frequency generated by rising edge.

Nice informative

Very informative video. Thank you very much!

Thank you. Very good Video !!!

Wow ! Thanks Robert but you are upsetting Netflix/Prime by releasing this video on Friday.. their no of viewers is getting down because of you😅

Great video! One request Make this kind of video for every circuit element. That would be great

Your Videos are a pure source of knowledge. Thanks for sharing.

Thanks! It was pretty theoretical right from university, I don't know something is missing. The part of stability was nice (don't put capacitor directly to opamp output) and for guarding. I think I am missing some practical solutions for low voltage signals. ECG, Potentiostat, Strain Gauge. These are pretty common applications where you can describe small lifehacks and tradeoffs with opamps regarding their parameters schematic and layout.

We need LED PCB design

Two cores. Fpu. 32-bit. Wifi. What not to like.

where i can buy that modul dev board like this video ?

Awesome! learnt a lot from this!

Great interview 👍🏽

Great discussion.

The errors you showed : there could be even more when you do Power electronic circuits. SMPS, buck, or power amplifiers, where current way, frequency behavior, and other tricks are very important. Contrary to what is said, it is allways cheaper to make your circuits yourself because it is rare that a first version has not mistakes more or less serious.

I tried one Chineese site to make nude cards, Result: Could not even pay : needing paypal and i don't know what services. Price is not so low when you count everything, i mean transport. So i'm doing it with a French factory. There could be errors anywhere: not only in China. But imagine there's a problem: pieces must return and go back: very heavy process!

Agree...😊

The Chinese have worked quite hard in the last 60 years to reach where they are now in terms of being self sufficient. Inspite of whatever flaws exist in the Chinese society and government, this is still truly remarkeable!