🔊 How to make an LM386 audio amplifier circuit
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- Опубліковано 28 вер 2024
- How to use the popular LM386 class AB audio amplifier IC to build a simple mono 1 watt audio amplifier. It costs less than $3 in parts!
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LM386s on Amazon: www.amazon.com...
Circuit diagram: bit.ly/2kep7h9
Duke Nukem Theme by Ed Dekker: • Video
Additional music by www.bensound.com
#Electronics #Engineering #Amplifier
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I hold a BSEE and I just wanted to let you and your viewers know that you do a fantastic job with these videos, I only wished that I had these kind of resources when I was first learning this type of stuff.
You are my hero. I'm an art major taking an electronic art class and we're using arduinos and I've got no idea what I'm doing but this helped a lot!!!
You have a great radio voice!
Thanks! It's the product of many hours of work for every voiceover.
Indeed, my native language is spanish and even so I did understand every word you said, thanks for take your time to do this video the best way you can!!
I was just thinking this on one of his other videos.
I used one of those on my research project back in 1985. Worked good. It amplified my Votrax speech synthesizer controlled with a Radio Shack MC-10.
Cool!
You can use it to amplify any phone!
Except iPhone 7!
It will work with the dongle.
kissben
I know that, because I have one
You can add a bluetooth receiver that connects to that 3.5mm jack and you got yourself a bluetooth speaker.
And in 2020 when even more phone companies have "mustered the courage" it is almost a rarity to have a PROPER headphone jack....Thanks for nothing "FruitHeads"... ;)
Excellent tutorial! The lm386 amplifier was my first amplifier I built 2 of them was used with 2 aiwa bookshelf speakers, very loud. No I have been building much higher powered amps, such as my 4,000 watt amp.But that's what I do now.
How on earth can you power a 4000 watt amp? I mean, you're lucky to get 1500W out of the wall and that's an entire dedicated circuit.
Great video! And I used to put a capacitor between pins 1 and 8 to increase the gain to 200, and that makes it a good electric guitar amplifier!
How it works??
Did you really say "After I was done beeing a striper" ? HAHAH!
***** I just didn't expect that.
Being a stripper is not a viable long term career.
Afrotechmods is it possible to have a pwm signal from a microcontroller be the input instead of the microphones that you have. would I have to change a lot at the input?
Afrotechmods I'm asking because a pwm signals isn't an analog signal so I'm just curious how it would work instead.
well it would sound like shit
I usually use TDA1554s for generic audio amplification purposes. 4x11W or 2x22W, just as simple to use as LM386 and still quite cheap.
TDA chips are rarity now.
@@richardlighthouse5328 what the heck happened in those 1.8 years since he posted the comment?
@@Razvii idk maybe died?
@@richardlighthouse5328 I meant what happened that made the ICs a rarity
@@Razvii Manafacturer marked them a obsolote
Def building this as a project. Will document all steps, sims, etc., & make the case out of acrylic so it the work can be seen. Thanks so much! 👍
This one of my first electronic projects. I built one when I was 11.
I wish I could upvote this video twice. Well done.
"After I was done being a stripper"
- What the heck did I just hear?
- Scrolls down to comments
you could also build two of those, one for each channel left and right and BAM stereo amp
Connect pin 2 to GND with 150 ohm resistor, not directly. It will work better. Put 100uf capacitor in parallel with DC input. There is one in your diagram but we often forget it! And if you want bass booster, connect 333 ceramic capacitor (0.033uf) in series with a 15K resistor, and then connect other pin of 15K resistor to pin 1 LM386, and other pin of ceramic capacitor to pin 5. You can also adjust gain between pins 1 and 8. I usually use LM386 as preamp that can have up to 200 gain!
You need a capacitor in parallel to the power source, even if it is a battery. bypass is not needed (pin 7) and will most likely cause some more troubles.
Output capacitor should be 1000uf at least to get good bass and better working when placing 2.2 to 4.7uf capacitor value between your stereo to mono converter and LM386 input
Replace output filter 10 ohm resistor with 4.7 ohm.
It made all the difference putting the caps across the power rails and adding one to the bypass pin
Africantechmods, you rock bro! I built one exactly to your specifications and it works great. Greetings from Amsterdam!
Yes! Been waiting sooo long for an awesome video like this.
Just stumbled upon this channel
B A man
A Lot of great info simplified into an easy to learn visual and audible electronic gold nugget
Right on man great job
an other awesome video of one of the greatest explain brains on YT - thank you!
*tips fedora*
Hi Afro! I missed you a lot
I missed you too.
Me too
... thank you for sharing your unique skills with us! Presentation flawless!!!!!!!!!!!!!!!
Because it's the amount of current flowing into the resistor and capacitor in series. It's the rate at how fast the capacitor charges/discharged, is what makes the waves... Charge and discharge curve.. RC5.
Capacitors supply voltage when needed..
the resistor after the capacitor is what creates and gives the current to the.
Capacitors and resistors being used together are used for charge/discharge if you've ever seen it drawn/plotted..
I've been studying electronics for a long time.. it's actually paying off. Everything is basically about variable voltages.. and input signals.. and how you handled them.
i really like how you explain what's going on and why and how to solve the issues. WEell done! :D
You are wow, I came across the youtube videos for my project i.e. Parametric Audio Equalizer where I also need a amplifier. None of the video was clear as you explained, But you are video means a lot to me, thank you for sharing with us, great job...
hey welcome back ,keep it up
I want to learn a bit more about different types of microphones, how to use them etc... But I'm too lazy to read so I shall wait to see when it gets posted, or if ill get a comment saying there is already an extensive video on it. keep up the great work!
Thanks for sharing this Sir. Added 50k pot at input and works good.
superb, loved this.
Been looking for this for a while now, thanks a bunch
"sounds like bieber" ahaha Auto-subscribed!! Love your videos!
I'm watching this and listening to it with the circuit I learned to build here. Sounds good but I need to use the 1000uf. It has a 450uf on a 4ohm 3w speaker. Sure a speaker box of correct size would change the situation also.
Thank you! You're an amazing pedagogue!
That's cool, thanks for sharing it! So much to learn!
You are the da Vinci in our Time! Would pay a ton of gold to have u as my private tutor
I accept fair maidens as currency. I will also settle for reasonably attractive donkeys.
A donkey, a donkey, my kingdom for a donkey!
I can not believe how is this world. Yesterday I thought about Afrotechmods and if he is going to release a new video and here you have it. Ok ,ok... I also thought he got hurt on some of his blowing and catching fire experiments.
Another very interesting video tutorial. Keep 'em coming! Now I want to build this amp for myself. I guess I'll have to start looking on all of my salvaged electronic boards for parts since I am retired now on a fixed income. :-( Pulling components off of old computer boards, an amplifier and an old UPS power supply that smoked should keep me busy for a while as I continue to watch more of your video tutorials. Thanks for posting these interesting videos on electronics.
W Rusty Lane in eastern Tennessee (Witherington Place Railroad)
Just worked so fine 🙂 ..thank you so much
How to power up the audio amplifier circuit without a battery source, I mean is there anyway to power the the circuit directly from the AUX cable without any external power supply to the circuit? please help.
1:14 - This cracked me up! 😄
it looks good worth a go just for the fun of it. Thanks for sharing your knowledge.
Use two for stereo= twice as loud! Great video.
its work done thanks sir and i add potentiometer befor the speaker its value between (1-5) k ohm and i can control the sound
Great video. I was looking into amplifying output of my Helmet speakers. Trying to build something as small as possible.
Alright, very cool, that was a handy little video. Thank you.
This would be interesting to setup for my PC's beep speaker. I have it set to do a grub init tune however it's pretty quiet compared to IBM PC's of the 90's. Have it powered from a molex +12v
wow you sound great, and thanks for the great and easy to follow video.!
Again great video Afro :) thanks
" After i was done being a stripper..." LOL
Awsome vid ty. If we make two of these can it be used for stereo ?.
Could you please explain to me how to physically connect all the grounds together? I'm a newbie, and can't understand which wires go together, even when looking at the breadboard. It's very confusing.
the "After I was done being a stripper part got me" 🤣🤣🤣🤣🤣🤣🤣🤣
thanks bro. you rerally saved me ad my lab partner bro. ou are the best. bro.
- Purdue ECE 2K7 (two thousand and 7) ( 20007) (X [bar]X [bar]VII) struggler.
yea, i agree, he helped much me alot too.
Works Beautifully!
Hi, great easy to understand video. I really liked that you included the first version which gave unexpected results and then showed how to counteract that. I do have a question however, if i were to make this circuit for a stereo application could I just double up the circuitry to achieve the same result? Or should I add something else to counteract the coupling of the two signals for instance? furthermore how would I add volume/ gain control to a circuit like this and would it be possible to get gain control for two channels using only one potentiometer?
Thanks in advance, i hope you get to see my question.
Hi aphrotechmods,
I have a question about this high-pass filter that you implemented at the end of the video.
How does it work, I thought that a low-pass filter usually consisted of a resistor in series followed by a capacitor in parallel leading to ground, however in this schematic you seem to use a resistor and a capacitor both in parallel to the signal. How does this filter out the high frequencies? Because it has a resistance value of 10 ohms regardless of the frequency.
Realize that the small 0.1uF capacitor will have a small amount of internal series resistance, so implicitly it is an RC high pass filter!
Ah okay, thanks for responding!
Exactly what I needed.
I just tore down an old Casio keyboard and I was like "How would I take these speakers and plug them into my computer"
Great tutorial again. I will try it.
I made this amplifier and it works but it has some sound like in the video before you put the capacitor. I tested with a 47nf capacitor and it removes the noise a little but again it makes noise like beeper
Hi! i kwow it is self evident to you...but you might tell that you need to put a speaker in a (large enough) box to get any lows/bass (as people watch you using bare speaker-no box). Just cardbord box, plastic drain tube that fits speaker or big tin can works ok (to boost bass).
Otherways people might think they messed up the circuit and has no bass output.
Your dear SIR are a RAZIXT with a Z all that video and not even an smiling cat!!! Never the less very nice video!! thanks for posting.."By the way I have my two cats here in my lap fighting for real state to lay down!
Nice video, and well explained.
Thanks. This video helped me a lot.
this is extremely helpful, thanks
Sir you made me love and learn electronics, few month ago I tried to make a stereo amplifier by using 2 of this circuit, but when connecting them to a stereo potentiometer I get a very loud noise, would you please help me do that the proper way.
at 4:44 you said rc high pass filter , but from the rc low pass filter video i saw that the resistor is connected to the signal and capacitor to ground , and for an rc high pass filter is capacitor first and resistor to ground, isn't an rc high pass filter supposed to attenuate the low frequencies?? and the rc low pass filter is the one that attenuates high frequencies ? i just seem to confuse this whole thing, would some one explain it to me ? ,
thanks
A bit late. See, high pass filter passes high frequencies. Here it is passing high frequencies to the ground, letting lower frequencies go the other way. The tutorials for low pass and high pass are actually the same thing from different views. In low pass circuit you choose a high frequency cut-off with capacitor and resistor combination and take the lower frequencies to use. In contrast in high pass filter circuit you take a low frequency cut-off combination and take the higher frequencies into use. In both versions you could take the other part of frequencies.
Thanks , man , this is really nice!
Get a PAM8403, which can drive with 5V happily.
There is a huge distortion on LM386 with 5V.
The 104 capacitor @ 0.1uF always work like magic
With audio don't you have some negative voltage signals? How are you able to amplify that using a positive only voltage? Don't you need plus and minus 9 voltage?
Heya bro 🎉 your circuits are great it’s important I mention I successfully made your speaker circuit. I’m interested to know I have a speaker that’s 3.5 ohm 3 watt and how does this react in this circuit ? Using ofcourse 5 to 9v
I think it would probably be fine just don't expect to be able to drive it at full power.
he is back
GOOD, NICE video! Thank you!
Hi except for the supply voltage, do I need to provide a supply current for the lm 386 chip
realy liked the video learned a lot
how do you connect 2 of the circuits together to make stereo? and do you need double the power supply for 2 ic's?
another awesome video! thanks.
Loving this channel!!
If there was a way to order supplies from a Canadian retailer and support these types up uploads, i would use it. ;]
Worked perfectly thx but what do I do if I wanted to add another speaker to it.. Do I have to decrease the value of the output capacitor or....
How can I connect two separate lm386 modules that are mono, together in bridge to achieve stereo with a single power supply?
Can this be done without a 3rd lm386 ic?
Where can i give a potenciometer for amplify or weaken sound?
Great Video.
This may be a stupid question but you say the battery will drain quickly, would the battery drain when no music is playing or only when there is something going through the amplifier?
Also, Do you know if you could build a circuit that will stop music from going over a set level.
I deal with people with learning difficulties and they play music too loud but don't have the capacity to turn it down. Thinking, if there was something to reduce sound to a set level would be a great piece of equipment and save the LD from getting evicted.
Thanks for help.
hahahah.... free tutorial with free jokes. 2 thumbs up!!!
Great One ! Mate, Can you also do a simple Speaker Level Amp ? Want to beefup my center channel output from a samsung soundbar. I appreciate your valuable input Cheers
Could you describe how/why a more complex stereo to mono summing circuit would be made?
this metal sounds like bieber died laughing man
Good informative video...Thanks!
I use tda2030
pentawatt package
up to 20W
dual supply for no coupling cap.
I have make the same ckt and everything connects properly and speaker also make hiss sound but unable to play music. Please help me out of this
Afroman, I just found your channel and I'm hooked!
I recently became interested in electronics and, as part of a research paper, I'm trying to build a sound installation that needs me to build many amplifiers/hooking stuff up.
Would you mind giving me a hand (I'd have some questions)?
Circuit input works, but in the output sound is not coming
Nice...can you show a simple stereo LM386 based schematic
Brian C It is the same circuit without the mixing in the beginning and for each channel one circuit and speaker.
Can you tell me " if " and " how " could I connect this circuit to the arduino, because I want to send sound through my arduino to this speaker ? Please help me
Can you replace the battery with usb? So u can power it using the pc ?
I got problem sir..when I touch aux jack with bare hands,my speaker works well but when I use phone and play audio, the speaker is not working. It is producing very little sound such that I have to make my ear touch the speaker to hear.What is the reason behind this...and I am using 8 ohm 2 watt speaker..🤔
what about stereo? would you have to do the whole circuit again for the other side?
Yes. There are of course other amp ICs that have stereo built in.
using 100k resistors instead of 1k resistors on the input makes it sound slightly better and reduces noise from stray radio waves
Why 25v on the caps? What determines what volt cap to use?
Does putting the pass filter at the output differ from that at the input??