What is an op amp? Operational Amplifier tutorial & super spy microphone circuit
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- Опубликовано: 7 авг 2024
- Afroman goes over the basics of how to use an op amp (operational amplifier) to amplify tiny voltages, and builds a circuit to listen to very faint sounds with a microphone.
LM324 Quad op amp: www.amazon.com/exec/obidos/ASI...
Circuit diagram: www.afrotechmods.com/groovy/am... Check out my webpage www.afrotechmods.com for more videos about electronics!
Twitter: / afrotechmods
Facebook: / afrotechmods 
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Thank you!! I didn't even plan on learning this subject but it was just too interesting to pass up.
Btw, do you plan on creating more Udemy courses?
No electronics tutorial is complete without cats.
+Bryan514 Now it's time for the cat to be a part of some circuit :D
yeah
Let's plug a cat to the mains! :D
I'd hate to see a cat on photonicinductions channel. "Till she pops" he'd say.
it's just common sense!
I like your use of cats!
Between you and Great Scott, I've learned more in a few days than I picked up from several semesters worth of college EE courses. Only about 40 years late.
As usual, your video is the BEST. For all the naysayers about universities, I use your video in my classrooms, from AC/DC onwards. And build the circuits you talk about. Thanks Again. YOU ROCK!!!
There are plenty of tutorials on opamp theory around, but this is the first one I've found that actually take a PRACTICAL approach - the only approach I can understand! Thank you and your technical afro!!
I loved the explanation you gave and that cat is so cute!
+Amogh Gajare Meow
Hey man- just wanted to say thank you for your videos. You really have a wonderful gift of easily explaining things. I watch some of your videos, on concepts I've struggled to grasp for a long time, and then it just clicks. Thanks for sharing your knowledge. Keep them coming!!
I'm so amazed how this video is 6 years old, yet the quality is so on point! Great job!
I'm so amazed how this comment is 4 years old and how this video is 10 years old, yet the quality is so on point! Great job!
@@alperenyurdakul1464 I'm so amazed how this comment is 2 years old and the heading comment 6 years old while the video is 12 years old, but it is still good and clear as the one made today
your tutorials are brilliant, distilled and humorous. i intend to watch them all. electronics don't have to be snooze inducing or overly complex and you are switching on the most important switch of all. the "i can" switch. i explain this stuff to my music students and your tutorials will become part of the homework. you are a gifted teacher. kudos. keep up the flow bro---
I have seen your comment on Great Scot channel last night and that brought me to your channel, , still exploring it but so far , you are good and it worth sub. Nice job.
Engineering class at university would have been soooo fun if it was though like that...with actual real life application of an op amp, instead of hours and hours of solving complicate problems that you'll never see in real life....
otbway So true... might have ventured more deeply into HW instead of sticking to SW as I ended up doing. Now, years later, as I'm messing around with electronics in my free time I'm starting to recollect some things I learned, and all of a sudden they're no longer drab, boring symbols on a piece of paper - they're something tangible and useful.
just dont go to university and dont try to learn anything, cuz we all eventually die so its useless.
Feels existential crisis man
" instead of hours and hours of solving complicate problems that you'll never see in real life..." hahahahaha roflt omfg you're such a noob hahahahahha im literally rofling....
Guys, look! Maxwell is trying too hard to become a meme again.
I watched tons of videos about op amps and never got it, just now I got it, it was with a big distance the best viedo I have ever seen in this topic, thanks a lot.
Perfect. I was thinking about getting into electronics this summer and it looks like I'll be using your videos. Teach me your ways sensei
haha same
You're so awesome! Please keep doing these they're so fun to watch and straight to the point (:
Literally the first tutorial where i get how the op amp works. Thank You !
Out of all the "Interesting Fact" videos I've watched for ECE207 prelabs, this is my favorite one.
Which school?
Purdue University, Boiler Up!
Crazy. I had no idea my stuff is being shown in Purdue.
a circuit i built once before was a 4 mile mike and its super sensitivity and amazing gain makes it so sensitive it can hear the most tiniest whisper you can ever make 14 feet away and around the corner of a wall and thats amazing, the sound of my tiniest whisper is beyond faint, which means i have to have my mouth right in your ear so you can just hear it so with this circuit 14 feet away that would be considered impossible but it worked im recreating this circuit again , the circuit used 1m5 potentiometers which ive found dont exist online anywhere not even e bay so i had to make some changes hoping it would work but despite the feedback squealy it worked beyond what i expected . and i had to adjust it to reduce the feedback to the edge so its at the beginning
Awesome explanation. Made complete sense the whole way through. The theoretical side with the schematic explained and then the demonstration at the end. Mint.
Subscribed
That was really cool. I like how you demonstrated something that we can really use and really put together. Thank you!
Seriously who have disliked this video? That was an excellent video depicting all the important stuff about Op-Amps.
This is the best video to introduce op amps I’ve ever watched
I will nominate this video as a BEST OP-AMP TUTORIAL VIDEO AWARD!!!
I will nominate this comment as the creme de la creme of comments!
dude, u have the best tutorial... quick and concise, easy to understand, and entertaining and funny to boot. love it
You have helped me learn a lot. Thank you. In fact, I think I have learned more from your electronics videos than from anyone else's videos by far.
Very clear and help me understand how op-amp works. Great video!
@davidenelson Contrary to what is presented in this video, the better volume control circuit would be to have a fixed gain amp (e.g. gain of 10 to 20) and then use a potentiometer to divide down the input voltage.
Simply the best tutorial/refresher videos on RUclips. Thanks Afrotechmodman.
You're so good! Unbelievable great to listen and watch your video's. Impossible to express how great they are.
+Guzzi venture Thanks!
jesus man once again youve taught me something extremely important that iv been trying to confidently n comfortably understand for years which is negative voltage, iv had a pretty good understanding of it but iv never really had a good "feel" for it.. idk how else to explain it thanks so much i wish i found this video 10 years ago lol
Fantastic Video! I'm an Electrical Engineering Student, and you just cleared up so many questions for me. Thank you.
cat noises amplified > ASMR
cat noises > EVERYTHING
Afrotech mods. Why you are not making videos now
Seriously your tuts are gr8
and so is your Sulu impersonation : )
Hi, thanks for sharing this video. This is what I was looking for! I've got tired in the harsh theoretical lectures without basics. Finally something that I can use after first watch. :)
@hyperboogie Normally the resistor is needed to set the cutoff frequency but in this case it's also essential because it acts as a pulldown to ground, so the signal ends up swinging from -10mV to +10mV. If all you have is a capacitor sometimes the output floats around DC biases you aren't expecting.
Real good stuff. I'm currently in EET and just about done. very cool lab.
it has been 5 months and i couldn't understand these things! YOU ROCK!!!
@alpha001ful Lower resistances means more current needs to be drawn and that's easily avoidable. And a small signal op amp can't deliver enough current to power things like a fan.
I just made this and most of what I was getting was the local radio-station... :)
Thanks for a great tutorial and keep making awesome videos!
Great balance of info and humor. Love the cat at the very end!
I'm Dutch and 14 yo, and the subs help me a lot with understanding everything you say. Thank you!
Just the cat alone already makes this vid awesome, not to mention the actual information, which is already really well explained and clear. Thanks for uploading it!
You make me feel geniousish with every video. So addicting.
In less than one minute, I was able to understand the use of opamps! thanks!
its nice how easy you put words so we can understand.
@bcsupport Totally! But not the op amp I used. You would want a high speed buffering amplifier. Analog Devices, Linear Technology, National Semiconductor and Texas Instruments are good places to start looking.
Dude! you are awesome! college makes me hate electronics you make me love it again
@mdesm2005 Yup. 9V batteries have significant internal resistance.
Toaster oven ding = brain done. Best laugh I've had today! Thank you!
dude, you cant imagine how much thankful I am
great video my friend. most informative. i was amazed you posted this in 2009. you are doing world a great service. thanks you again. keep up the good work.
@Afrotechmods Awesome. Thanks for your help, and your tutorials rock !
good circuit, the ones we built in electronics were twin output amplifiers, very simple to make, a few caps a couple resistors and the IC
very precise and to the point ....excellent video
Great video and a fun way of teaching. Thanks
You've got great tutorials! Keep it up!
Thanks for the lesson, I sure still have a lot to learn. Just hope i don't lose my mind trying to.
WOW This explanation of amplifier is amazing. Easy to understand and funny all the way.
Thank you for taking the effort ofmaking this.
OK, this has to be THE BEST electronics tutorial I have ever seen.
"And you only have to use...as many as you want". Classic.
It's also 100% RUclips compliant because it has a cat in it.
Oh, and I learned what I cam here to learn.
Great videos, well cut and to the point ...
Great video, you gave an easy way of understanding op amps . Thank you
Thanks for this ,you have a great way of explaining.
Your videos are great brother. I find it funny how you started out with an old owon and now you've got that nice free keysight they give all the channels that get a good following. Not an insult. You deserve it and it really ups your video quality.
@Anathor666 It could be anywhere from 100 ohms to 1 meg - I just found by experimentation that 5k gave me the biggest signal and resistances lower than that didn't give me any extra benefit.
i just wanna say THANKS dude !!!! you save my project with this vedeo :D
Gr8 explanations. Do you have videos for explaining voltage regulators, lm317 and lm7805?
Nice video. I hope to know more about how single supply opamps work when it's single battery operated
The theory behind op amps is actually really interesting.
@Knightmetal It should be the same ground i.e. they are connected somehow.
Thanks, I'll think about it. I still have it on solderless breadboard trying to add more features (switch to gain change, power switch and LED etc) before putting it in box
This video is very usefull!! Thank you very much it helped me a lot becouse i just started learning about OpAmps. It made it very clear and simple!
He is a big help for any electronic level.
Featuring AfrotechCat... 😄😄😄 Nice video man 👍 love your tutorials
A perfect video. Informative, to the point, and also very droll. Full marks.
@TheGuyInUrCloset It would be the best to have a fixed gain of 10-20 or whatever and then have the pot at the input of the amp.
awesome. I've always wondered.. how is audio collected by a microphone and turned into a voltage ?
This is brilliant. Clear and concise.. .... And the brain bit made me laugh... well done
Oh man thia video was just amazing...!! 😊😊
Thank you for it... 😊
Keep growing...!!
Really smooth,funny,Niiiiiiiiice and the most Important it's really Helpful tutorial>>> Thanks
god bless you
"جزاك الله كل خير"
Thank you! I've finally made my guitar pre amplifier thanks to your video. But the potentiometer at the end... I think it woud be better to connect it like voltage divider, so one end of potentiometer goes to op-amp output, second end to 0V and the middle to speaker or in my case jack output.
great explanation. thanks for sharing
@samanthms123 It would, but you wouldn't be able to see much because the blinking would be too fast. You might be able to see the high and low parts of the sound.
Bro thank you very much I watched a lot and I mean too much videos but I understanded from you keep up the good work
Amazing.... finnaly got a place where i can kill my hunger... thanks a lot... loved your tutorial....
LM324 IC is a very help in my projects..
we can use single supply.
Nice diagram showing how to create a duel power supply.
You should put together a DIY package for the 2, 9 volt battery version.
Would make it more inviting for people that are curious enough to think about it but get lost or discouraged when looking for the parts.
If you do include a mic jack and a speaker wire output clamp.
Would also be great to see one for an mp3 stereo amp with stereo speaker wire clamps, for this if I was you I would go for quality sound over a price savings of a $20 dollars..
Thanks again for another great video,
Cheers
Maybe something about a basic opampsand transistor applications? Of course without too much simplification. You're doing very nice job, regards!
Hi Afrotechmods, when can you have a new video tutorial? I've been waiting it. You're a big help to electronic beginners.
Love it. Clear, straight forward explanation.
Encouraged by your video I´ve made the circuit.
I have a problem, When I disconnect the batterys common terminal to GROUND, it works perfectly, but it stops working as soon as I make that connection.
THANK YOU! It's a very good video.
Thanks...really easy explanation and complete!
awesome!, simple yet effective way to explain. I hate those long videos.
excellent work sir, thanks for helping people may god bless u !
you rock man you're simply the best you helped me so much at school!!
U ARE AMAZING! Now i get what i seen on oscilloscope. You should be my teacher in college :)
Finely explained, grateful !..and the cat adds up to the presentation, adorable.. ; )
That was explained extremely well... thank you!
Beautiful tutorial