Testing circuits I found on the Internet: Inverter! It does work, BUT...
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In this episode of "Testing circuits I found on the Internet", I will be having a look at a popular inverter schematic I found on google images. The design uses an astable multivibrator in order to pull current alternately through a transformer and thus create a high AC voltage on its output side. A lot of DIY inverters use this functional principle. That is why I will build up the schematic, properly test the circuit and show you what problems it comes with that you can more or less easily fix. Let's get started!
Thanks to Brilliant.org for sponsoring this video.
Music:
2011 Lookalike by Bartlebeats
0:00 The schematic I found on the internet
1:06 Intro
2:09 Building up the circuit
3:13 Initial test
4:23 How the circuit works
7:32 Problem 1: Feedback
8:45 Problem 2: Overvoltage at the MOSFETs
9:20 Problem 3: Overvoltage at the Transformer
10:11 Other problems (lots of them)
10:42 Verdict - วิทยาศาสตร์และเทคโนโลยี
We want a "Random circuit I found on Internet" series. 🙌
If viewers ask for it and the video performs well then there will be more ;-)
I'm particularly fond of DiodesGoneWild when he dismantles cheap Chinese made chargers and shows their poor construction.
Yes please.
You could look at plasma speaker circuits, with a 555 timer. You could test if those work better tham yours.
Or you could look at some fm/ am shortwave radio transmitters. You could compare transmitters with a LC circuit or a cristal osccilator.
Thanks for the vid, it whas great!
@@greatscottlab can you test a popular FM radio transmitter circuit on 1 or 2 transistors? (or receiver there are a lot of shemes for them) i built like 3 of them and none is working, and i don't know that do i do som
ething wrong or is it just scheme bad
@@greatscottlab wondering could you make a portable electric guitar amplifier with input voltage of around 11.1 volts m I have several li-on batteries
This new series is something I would definitely watch. As people will miss out a lot of things whenever they see a circuit on the internet.
@karthick Exactly my point
That's why trust oscilloscope not the circuit description of those project circuit.
We need more episode....
"let's see that sinewave..."
That part made laugh too hard I nearly choked
As terrible I am at math, even I know how the sin wave looks like
Sometimes I can be funny.......but not often....back to work!!!!!
@@greatscottlab 🤣🤣🤣😂😂👌
I busted out on the silence after he saw it too, then scribbles...
@@greatscottlab hahahaha
Me: _"Mum, can we have a real sinusoidal waveform?"_
Mum: _"We have sinusoidal waveform at home"_
*Sinusoidal waveform at home: **5:00*
that is totaly like my mom
Lol ikr
haha
Lmao
Lol
4:52 That complete silence made the moment so good.
He could have added a cricket 🦗 sound to make it more dramatic 😂
I needed the silence. I had to concentrate on the perfect waveform! :-D
I burst out laughing!!
I knew it was gonna be square, err, squarish? By Tesla forget that.
The Title of your new format already gave me the chills..
Awesome.....that is the point ;-)
Reminded me of an old Tarantino film. In a good way.
Maybe you can do the whole series of testing random internet circuits?
That is what I had in mind. Of course only if viewers want that and the video performs well
@@greatscottlab I want it!
@@greatscottlab I want it!
@@greatscottlab and please do include circuits that do work safely. Because the outcome of this video is that nobody watching will build it!
This video is kind of BigClive video: not for building things but for understanding... but I guess it depends on your goals, whether you want to imitate BigClive or provide circruits that viewers can reproduce.
@@greatscottlab Make it please
Building a random device from the internet - sounds like a great topic for videos, hope this will ignite and not burn )
It is ok if it burns as long as you have your anti-explosive pie tin.
"but you're not reasonable, and want to save money" lmao i love this guy
I have watched the video halfway, this is gonna be a good one. We need more of these.
Thanks mate :-)
I really appreciate this kind of video where you test circuit from internet. Maybe you can also do some circuits from forums!
I will see what I can do :-)
Now we need a circuit of an inverter that does work and creates a perfect sinusodial waveform! :)
Absolutely love the idea of this video series!
Glad you enjoy it! More to come hopefully
This video series could be great. We could learn a lot from these
Finally a new video, our beloved Great Scott has returned!
More to come!
I would love to see more videos on this series 🙂 especially some of those simple circuits found on internet such as descrete opamps etc...
More to come! Hopefully.....
5:00 That silence is great, I love that moment. Perfect execution.
deception face time xdd
Same!
There are always 3 obligatory steps when designing new circuits:
- simulate them
- build them
- measure them in real life
What is a good simulator to find that simulates in a lifelike manner? Have a lot ot issues when i mix high power with sensitive stuff like micro's and analog
1. Build
2. Test
3. Deal with unforeseen consequences
4. Find out what went wrong
(or grab a crowbar and fight aliens)
I used ltspiece in uni no idear if it any good for your use case
Don't forget to understand how the different elements in your circuit work and how they interact. This is probably the most important thing if designing your own instead of building an already-designed circuit. For instance, you can connect an LED to a battery and have it light, but if you don't understand the IV curve of LEDs your circuit will be very unreliable.
Please do this as a series! I've learned everything I know about designing and building electronic circuits from the internet, and as a result have learned the hard way that there's a lot more to building a functional device then just a shoddy circuit diagram from Google!
Excelent Dear Scott....!!! really amazing...!!! Congrats from Argentina!!! a Really fan from all what you produce on your channel!! DO NOT STOP!!!!
keep the videos coming. thank you.
Will do!
Do more "Testing circuits I found on the internet" this was really fun. Also can you ike me to the pens that you use?
Stabilo Point 88
@@greatscottlab Thank you so much Love from India. Keep up the amazing work.
We Want more episodes of this series. I learned allot from today's video. I used to think it the output is 240v then everything is good, but today I got to know so many things.
I love love love this series, it's really inclusive with your audience.
I would like to see you have a go at one of those designs that modulates high frequency PWM into a sinusoid.
You should try some of those FM or AM circuits that they have!
This sort of format is especially educational. Every hobbyist looks for schematics online and pointing out the little traps and gotchas is extremely important.
Keep this series going, Scott, really informative. Thanks.
You should try out one of the 12v fluorescent lamp driver schematics that's floating around on the interwebs... there are a few different variants, with and without cathode heating, and it'd be interesting to see how they compare.
The ones which apply a waveform with a DC component blacken one end of the tube quicker and reduce lifespan. The cathode heating helps with starting I think.
Very interesting, could you check some projects related to "Arduino MPPT solar charge controller"
Loving the idea of testing circuits from the internet!! Looking forward to a few more of these!! Great video, as always!!!
I hope this becomes a series, this was a fun video to watch.
Would be nice if you can show comparison schematic before and after fixing the "issues"
I don't know as much about electronics as you do, but when we both read "astable multi vibrator produces a near sinusoidal waveform" I must admit I laughed.
"What could go wrong?" **Boss music intensifies**
Worked almost 2 years on a automotive 12V to 230Vrms power inverter (modified sine wave output), with start/stop support. It definitely is not as easy as people on the internet make it seem. Majority of the cheaper inverters on the market are modified sine wave, which has an issue of high inrush current at the AC output due to the square wave nature of the voltage. Pure sine wave inverters require a lot more design work and complexity but somewhat solves this issue.
After working the project for such a long time, I had to add in a secondary voltage stabilizer, such that the input voltage will not affect the AC output. The feedback you mentioned is critical in maintaining correct RMS output voltage, along with the frequency. I ended up also adding a constant current mode controller on the secondary side to help bring up capacitive loads (such as common chargers we find now a days).
Even I knew about this matter, it is enjoyable and entertaining to watch your experiments! Thanks!
I'd love to see active noise cancelling or reducing headphones as a new project!
greetings from Germany :D
I can put it on my to do list
@@greatscottlab :) 👌🏼
Your videos are very well structured and are giving a well understandable look inside new topics.
Continue like that!
Please do video with sg3525
I will eagerly waiting to see you next time... I have subscribed you from last 4 - 5 years.
Thank you so much for sharing knowledge... It helps always...
Thanks for watching :-)
LOVE this video. Please make it a series and continue with more episodes
3:58
GreatScott: "Mishandling of such a high voltage can lead to fatal injuries"
Electroboom:
ALL THE VOLTAGE ALL AT ONCE what happened to him by the way?
Very interesting series. Thank you Scott.
The Internet would not be complete without people like you that point out designs that don't perform as promised.
I love this new series, Please do more!
Good job, this series is definitely something that is needed.
More of these please and thank you.
Hey Scott!
You could make more videos of random circuits found on internet. And then maybe in same or other video address all the flaws and drawbacks to make a more or less perfectly working circuit. That would really help people understanding what is wrong and what is write way to do things.
Love your videos❤.
I loved this type.
Please continue doing this type of video series.
thank you so much for all the super informative content that you upload! greetings from italy
Thanks Great Scott. This video is a very much needed warning for beginners in hobby electronics.
Great series you have started to test online circuits... Enjoyed it... Hope for more ..
You should definitely make more of these videos, I love these
I saw ur post on facebook the other day so i already know what's gonna happen but of course check ur vid was the first thing when i got home after a 12 hours drive. And i only would "copy" circuits from good known electronic sources like you, electroboom, diode gone wild, and other good youtubers. Keep the awesome work man! PS: Ur excitement while saying the outro // Everyone liked that!
This would be a great series to continue!
Great learning, as always! Thanks
I like this new format, more pls!
pls make a series out of this, this is really entertaining
Watching again to show support for the concept (but also good circuits)
This was a great idea! Looking forward to more like this!
I love the idea of a series of this type of video
Love this new series! (At least I hope it’s a new series)... If so, I would love to see one done on some RF circuits in the future if possible; maybe RF receiver?
Great Dude, thanks and appreciation from every angle...
Totally loved your efforts!
Great, please more of them
Love this new series...
please keeping this series up we need it
This definitely needs to be a series!!!
Great series idea!
Please do more of this series🙏
Your every experiment learned me a lot
Excellent analysis. Thanks a lot
Your videos are great, thank you.
This series will greatly help beginners who otherwise, might fry up a lot of stuff. Keep this going.
That's the plan!
i always loved your videos. never skip your videos
Nice to know. Always test new circuits.
Love this series
Very interesting video. Thanks!
Way over my head but love watching your videos learn a lot
Thank you
Nice series!
This series is going to be fun!
Loved your new video... we demand more like this love from Bangaldesh
There are so many circuits on you tube and the internet about changing voltagelike buck boost and variable voltage circuits. But none of them mention the voltage under load or about the current variations. That makes thosse simple variable V controllers like tose with lm317 etc to break down under load and in real conditions. Would you kindly enlighten hobbyists like me about such circuits? You seem tomake dependable circuits and your explanations are thorough and undertandable. Thanks for your contributions and kindly continue to do so.
This series is gut continue!
maaan... i was really hopping you would add a feedback circuit and fix everything...almost... a great one... for years i'm putting off making one... now i know i did good... but would still love to see you build one that is actually good... keep it upp love your videos
Thank you. Good work.
You are an inspiration for the beginners like me....
Thanks, interesting and a never ending series might be possible! Keep up informing us on these nice circuits which are somehow not ment to be implemented!
Always educational videos he always knows how to explain the circuit schematics in a way everyone can learn how they work.
Brother, keep going all support will be there for you..
Intresting video, more of that kind would be great.
Hii greatscott, Big fan sir, your awesome project and your way of teaching inspired me to persuade robotics and i am very thankful to you that you motivated me
Brilliant :-)
Thank you Scott
More of this please!
very thanks for your video sir.
Love the new series!
We need more videos like this!! Love your videos
More to come!
@@greatscottlab can u make a SMPS circuit found in internet like using MEJ13003
very very very good. Thank for alert and share with us. Regards from Brasil.
Glad you enjoyed it!
Thank you! Saved my butt with this one!
That's a really cool video concept!
Dude!! exactly 2 weeks ago I made this deal, it worked to 120v for about 2 minutes!!, and like you said, the heat changes/kills things on this and BOOM Rico, it killed the 2 transistors. I might still build it again but with mosfets. Yes I got obsessed, and found a forum with over 60 pages of comments from the last decade, they got obsessed too!, it's the apparent symmetry of the circuits!