Make a Great Sounding LM386 Audio Amplifier with Bass Boost
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- čas přidán 25. 04. 2015
- Make a Great Sounding LM386 Audio Amplifier with Bass Boost
In this tutorial, I'll first show you how to make a basic audio amplifier with an LM386 IC to demonstrate the minimum parts needed to build a functional amplifier. Then I'll build a much better sounding amplifier by adding multiple de-coupling capacitors to the power supply and the input and output signal lines. At the end of the video, I'll show you how to add a bass boost control to the circuit.
Get an LM386 here: www.amazon.com/gp/product/B00...
The full tutorial can be found here: www.circuitbasics.com/build-a...
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The LM386. WOW, this brings back old memories. It reminds me of the LM393. I have been out of the electronics business for quite some time due to health reasons. But it reminds me of the time us techs used to build things such as our own Pay TV Decoders. They said that it was illegal, but that makes no sense since the pay TV video/audio RF signal was provided directly to us by the cable company, and provided for free. The only problem was that it was all messed up and needed a little bit of kind fixing that we each did out of the kindness of our hearts.
My decoder cost me a total of about $5.00. That includes me having to make my own PCB. It contained just three I.C's and a few other components. One was a cheap 8 pin LM393 dual comparator, a 14 pin mc4066 quad transmission gate, and the other was an mc14538 dual timer. This board only pulled about 15 mA, and thus it could be placed either inside the TV itself, or inside a TV converter box and then it would use the conveters power supply. This baby decoded the video, via line by line decoding, rather than use the complex frame decoding method, that required phase locked loop circuitry, which requires lots of parts, and thus in turn would require an additional power supply.
Ahhh, the good old days.
Yeah, back when people made color organs and you could actually fix things without a degree in programming. One of my favorite things to build was Larson scanners. You know, the scanning red light in the Cylons of Battlestar Galactica and KITTs little red chaser in his hood? Yeah, back when TV was actually entertaining too...
Way back when I also threw together a Hero 2000 robot that was in kit form. The damn thing when up in smoke to a degree a couple of times. It turned out to be a design flaw. On the motor control board, circuitry was set to change polarity of the power that was applied to each motor, thus motors could go forward or reverse. But it also had a couple of IC's dedicated to protect against both polarity selections being active at the same time. If this happens, then +12 ends up being connected to ground via a couple of power transistors. Well that is exactly what had happened. When Hero went into sleep mode, he shut down several power lines. By design error, this included the power that was applied to the IC's dedicated to protection.
Here is the funny part. Most of the time the protection IC's worked fine without power. They were receiving incoming signals, and the signals themselves were also acting as a power source for each of these IC's. Anyhow, the manufacturer of the Hero 2000 kit gave me a new motor control board, free of charge.
My Hero 2000 is still up and running.
Hero is what a Hero 2000 looks like. i.ytimg.com/vi/0V8EVtUM8yA/hqdefault.jpg
I remember those. Lately I'm building Dalecs. If your a whovian then you'd understand completely why a grown man would want a silver upside down trashcan motoring about spouting lines like "Intruder! Identify!" and "Exterminate!" It get's even more funny when you arm them with airsoft guns. It's amazing what you can do with a few microcontrollers these days.
is it possible to view the video as well as audio, directly via satellite signals . request to inform me the process
I bought an inexpensive drone and crashed it. I repaired it and was amazed at how simple the motherboard was. Just a few components although Surface Mount Devices which included Flight Controls and Analog to Digital convertors, receivers. etc.
Thanks I really appreciate your walk through vid, really like how you say exactly what components you are using as you put them in place, not many people do that and it's frustrating when they don't. I'm brand new to electronics so so it's refreshing to be told what they are, where they go, and what there doing.
Thanks again. Hope you make more walk through vids.
Built this circuit with a 1 watt speaker and fitted it in a coffee tin! I didn't use the bass boost but it's still good for my wee workroom and will be used for testing low output audio circuits and for music on my ipod nano, phone etc. I fitted a pot in the gain circuit on the breadboard but used a 5k resistor in my final setup as that seemed about right. Thanks for your great little circuit. Another happy customer! A bigger amp is my next project methinks!
I assembled one circuit(LM386) successfully but your circuit ideas concerning LM386 showed how to improve on it.Thanks a lot.
you made it so simple to build , and i have been reading books but couldn't understand what to do, you are awesome..
I went from this to having a dual LM386 driving to quite large 2 way Sony speakers such that its actually astonishingly loud. It took a while for my soldered board to be debugged but .. yeah. If you have adequate 9v power and efficient speakers. Then later I built a booster circuit with two transistors taking the out put of lm386 and amplifying that - it also sounds good. 1-2 watts of good clean sound can actually be enough to make something nice to listen to.
I'm just about to build a similar circuit and learning from you, thank you for the clear and well explained tutorial, you have a soothing voice :o)
his voice is like ImNotMagic's CZcams channel
Thanks :)
MsMadLemon use a TDA2822M . It is *_STEREO_* and sound a lot better. 👍😆
LM386 isn't terrible, but it's very primitive. I use them as general purpose op amps, but they can sound great as a preamp. You can even make a distortion pedal out of them as these distort with a pleasant note when you push the gain too high.
Thanks a lot, I was looking for LM386 step by step, I wish I saw it 2 days back, waiting for weekend.
And I did it sire thanks again
hey man, nice guide! I was wondering, do you have a schematic of this circuit? Keep up the good work
Teringat masa2 jadul dulu, salam sukses diy, very nice,
That's awesome! it works thank you..
Just what I needed. I think this would work quite nicely as a low-power pre-amp to shape the tone.
Correct me if I'm wrong but making a treble boost would just be a matter of correcting the values of the filter for your desired cut off and inverting the positions of R and C so that it's R rather than C that is connected to ground.
BTW, is there a dual input version of this so that it can manage stereo?
Nice vid! Do you have any suggestions/recommendations as i want to learn electronics with the goal of building guitar amplifier/effects pedal in mind, i know there are tons of info online but i dont have any idea where to start...thanks!
Pretty cool LM386 i made one and use mini transformer to remove noise
I believe you need to use a larger speaker so that the low (bass) frequencies can be heard better.
@Sachin Chowdhury You can use the LM741 as a substitute for the LM386, but it won't have the same power output (or pin out). The LM741 is an op amp and the LM386 is a dedicated audio amp. It's the right tool for the job.
+Circuit Basics will there be a lot of power difference using the LM741?
why would you recommend that, bad idea.
LM741 (or uA741) will work, until you plug into speakers (8ohm) because it's only 20mA max output power. Resulting to a completely distorted signal.
LM386-1 is 250 mA max output power. About 12 times more.
So NO, you CAN NOT use the LM741, it is a piece of crap only used for class demonstrations...
well said, the 741 is not in the same class!!!
ur circuit & ur 10k resistor do not match
you insired me to make circuts ur awesome
I built this bro! Thank you! It works well! Lmao its really cool!
Good video
Amazing tutorial indeed!!!
Also how big a speaker can I drive through this? I had a 10 W speaker with 8 ohms . How much can the LM386 drive?
This was very helpful ..can this be used as an onboard preamp for acoustic guitar with coaxial element and possible to add MID TREBLE as well apart from bass boost gain and volume ..much appreciated
Nice video like it
Helpful
Great video, thank you. Wish you good health and more videos. 12.2020
I got drunk a few days ago and somehow ordered 100 of those IC`s...well at least this is one of the more useful drunki purchases, i just wonder why i baught 100 of them....damn alcohol
you do this too!
I had 0.30$ on my bank card and i wanted to spend them on something i and i found randomly 10x chips that i never show before i bought them and now im here to see how to use them as amplifier :D
I got drunk a few days ago and somehow woke up in a strange bed with 10 prostitutes - before I knew where I was 46 LM386s arrived by courier.
I remember hearing you discuss a business idea with a 30ft tall plastic cowboy in the middle of the night outside a casino. You told the plastic cowboy you would make him rich with your headphone amplifier idea. You needed a 100 LM386s to start production.
Do not Drink and Shop Online.
I made this thing on a copper perf board, and ran it on a 5v supply from a mobile charger. When there's no audio signal, there's no static noise. But playing audio produces lots of noise. I don't currently have a 9v battery to test out. I'll test with a 1000uF cap on the power input to see if it's better!
Do you have any suggestion?
i just made the very basic first version of this on a breadboard and plugged it into a 12" speaker from a guitar amp, and played some guitar through it. hot damn. it sounds ridiculously good for the fact the amp costs substantially less than the 9V battery. with the gain pins bridged it's LOUD too! not sure about the impedance? anyways, amazing, thanks for the tutorial.
Nice, glad you like it!
dude google
'ruby amp schematic" its an lm386 guitar amp design that has been around for years, and sounds great.
Thanks for the very detailed tutorial, Do you mind sending me any other files etc that you have on this project that isn't on the website
Thank you for this!
+Alo Leceta no problem :)
One question,
can i plug a guitar in this AMP to drive a 4 Ohm, 3 Watt Speaker?
If you're just learning how to build stuff like this, DO NOT do it how he is doing it. Never connect your power supply or battery until you've completed wiring everything and have double checked your work. Maybe if he did that he wouldn't have had a Tantalum capacitor blow up in his fingers.
gatekeeper65 why not?....that just takes all the fun outta of it...haha
gatekeeper65 Reminds me of when I was learning about motor controls. I tried to make changes to my circuit without removing power, and I vaporized the end of a banana plug.
I mean, when I was like 6 I blew up a yellow led... it was fun ig
he did leave part of the audio in hanging out... =D hahaha
Username checks out lol
Thanks for this video.I am new in this type of things but i like do projects like this.I wonder if i could instead of a speaker , mounting a jack output and make an amplifier to drive my headphones.I am looking for this information on youtube ,but nothing specific about the type of the amplifier i need.THNX...
I want to learn more about this especially the quality of sound and bass and how to get louder sound without that noise
very good idea
exelent video ... just what i was looking for and the step by step was awsome...
if u have the change to find a circuit to increase the power of an lm386 amplifier like the one u did ... or another easy to do amplifier to get more watts out of it will be awsome .... very good video and step by step ... hope to se more of them ... have a subscriber here bro
Thanks, glad you liked it!
Thanks for this video, I am creating a small stereo speaker/headphone amp, and I think I'm going to use your design, modified slightly. Do you think using a MOSFET for a preamp (before entering into the POT/ground would increase the quality of the amp? OR would it simply make the volume far too loud, and go beyond the IC's voltage? Would it be better to use the mosfet/transistor amp on the output of this amp? OR is this no reason to do either? I also want to add a couple filter circuits to the output to increase the quality. Since an amp is really only useful for very expensive, and high-quality headphones. I am a noob at electronics, but this is my first 'real' project, meaning im going to fully assemble each circuit, add it to a quality metal case, cut out a user interface for the gain/volume, (on/off LED), bass control, Two 3.5mm jacks(in, out), and probably 4 speaker wire clamps for unpowered speaker hookup. My question about the secondary amps are especially aimed @ the passive speaker outputs since they would require much more power, and likely a larger signal than a pair of headphones.
I'm sure ill fail miserably on my first few attempts.. actually I've already put together like 2 working mono amps, 3 non-working stereo amps, and 1 working stereo amp, and a whole lot of non-working LM365 amp circuits... thank god for your video here, or I would never have figured it out...
Also, do you think you could do a few more video's on audio amps? This one seems to be really popular... I'd love to see you do a stereo version of this same amp, also a few diff classes of amps especially ones which use only Transistors/MOSFETs/etc.
vwey good sir, you have a new suscriptor
Very Good , in question on your Input leads 3.5 plug what is located inside ""Series"" with the leads seems to have a Resistor? thinking Grounds or loops from Computer and other units having voltage different that might be on the line to cause harm ? You did say on your Blog ? couldn't fine anything about it. Thanks for your Efforts 73's Dale
You're a legend
muy buen tutorial felicidades , hola amigo no se mucho de este tema pero si me gustaria aprender aunque no se ingles con los movimientos entiendo un pocoy aparte me gusta la electronica mucho saludos
Thanks sir.
Hey, cool video! Do you know anything about static noise in subwoofers? My laptops subwoofer makes static noise.. I've tried all drivers that I could find on Internet but No joy..
You may want to disconnect the power first before doing connections, that way you could avoid damaging components with wrong wiring. Just a tip.
các ban có thể tham khảo sản phẩm tại: www.sendo.vn/lm386-dip-combo-2-chiec-9073922.html
Very nice project. i was very interested for it and finally i try it in breadboard. i use 0.5W & 8 ohm speaker, but sound is noise-able. Which speaker is best for this project ??
And i use normal 0.1m/f capacitor. is it the coz of Noise?
I want to build an LED sound level indicator. I want to use a microphone to detect sound. I'm having a hard time finding anything that suits my needs. This looks promising.
Question can I use NTE857M OP AMP, as a substitute for the LM386?
Show muito bom
Amazing. I wish I could learn to do things like this, I would love to make a 5.1 surround sound kit,
Specially with these or smaller speakers, but I suppose my idea will just have to remain as a idea
cool , please guide me also if u have succeded, coz am starting now
Can you please tell me if i wanted to add multiple stages in the same circuit using BJT CB & CE configurations,how will i find my biasing measurements??
Nice tutorial!
Does it matter if the 0.1 uF caps are ceramic disc or Polyester? I see you have used both types.
Ceramic
In the LM386 manual the filter connected to ground, and a 10uF capacitor used to gain. What is the different between the two methods?
I always use LM386-4 -- The -4 will give up to a full 1 Watt. A better speaker will make a HUGE difference!
I am using the design you used for the best not the one with a base booster but the other any ways I use easy eda to make all my pcb boards and when i check it be for aranging parts on a pcb it red flags 3 on the audio jack and i dont know why
Would I be able to hook up the bass potentiometer to another pre-amp circuit?
nice video
Hi. I just wanted to ask how would you connect LEDs to the IC so that they pulse to the beat of the music?
you never gave a parts list! I'm new to this and I'm here scratching my head!!!
+Julio Reyes check out the wiring diagrams in the blog post, there's a link to it in the description
What if you want to use more than one speaker? Like if I want to use 2-3 8 ohm speakers? Also, are there speakers out there that have built in bass?
It would be interesting to test it. Put a oscilloscope on it and a load. If that works out and results are good pair it with a speaker thanks for sharing.
Hi, I was wondering if it's okay to use a 4 ohm, 3 watts speaker and what capacitor to use for this circuit. Do I go with 1/4 watts or 1/2 ?? Wish you can help because I am just a newbie in this electronics stuff. Thanks
Merci pour le tuto
Sauf que j'aimerai bien mettre un connecteur RCA femelle et un connecteur Jack femelle en même temps comme entrée.
Comment je dois souder les deux entrées et est ce que je dois mettre un ou plusieurs composants entre les deux connecteurs comme protection ?
If I connect input from second circuit to el. guitar, would it work?!
does voltage matters ? lets say im powering the circuit from USB 5V or adapter 12V, will the circuit still work ?
is it possible to give a power more then 9v ? if yes then what is the limit?
and how big loudspeaker it can support ?
Can I use 0.1uF Ceramic capacitors instead of 0.1uF film capacitors since both should be non polarized?
I made a same one with two speakers. but the voice is not much as it is with other amplifiers.
I made it with 5k and 100 ohm potentiometers
and 220uF and 100uF. does it make a difference?
please reply ASAP
Thank you...
Can we just connect a semi-acoutic guitar to play ?
what type of potentiometers are you using? a , b, cts? i just wired up everything using 10k a pots "log", and for the bass pot i used a 10k b pot linear and i just get squealing
I built the circuit with a LM386-1. I then swapped it for the LM386-4. No difference in volume/gain. Tried both chips at 5v,9v,12v and the LM386-4 at 18v. No difference in volume gain.
Any suggestions on why and how to fix? I used 4 and 8 ohm speakers. I have a guitar pedal prototyping unit that supplies the various voltages so I can quickly test all.
What is the difference between Volume and Gain? I want to make an amp with a nob to increase distortion.
Nice video, could have helped me out a lot more with a couple basic (Even pencil drawn) schematics to help with setup.
if want to build this for an old turntable and a couple large stereo speakers what changes o i have to make ?
I found a problem with your circuit. If we fed an audio signal with a DC offset, which is very likely to happen, our amp would clip out most of our wave and a lot of distortion would occur. You can add a .1uF cap series to the audio signal. Another thing is that you are using only one channel of the stereo plug. You can combine the two channels with two 1K resistors to create mono out of it. A summing amplifier and a differential amplifier could also be used in order to make an "analog or gate" or basically adding the signals on top of each other, that would be a neater solution. It would be nice to add a 10K pullup resistor before the cap in order to power electret microphones. The dc offset will be filtered by the cap.
The breadboard is good but do you have PCB designs for this?
What voltage rating did you use on you capacitors? Couldn’t find that on the blog. Tried posting a comment but went to blank screen. Thanks. Would really like to see a parts list.
Oh I found the parts list
At the video, you connected the 470pf decoupling capacitor between pin 3 and ground but at the schematic at your blog, is between pin 2 and pin 4(ground). Which one is right?
Pin 3 is correct. The capacitor is intended to short radio frequencies immisions from the non-inverting input to ground. But in the video is another more relevant error. The positive electrode of the output capacitor (1000 µF) is not connected to pin 5 (output) of the LM386 but to the midpoint of the Zobel circuit. So the speaker will only get less than half of the voltage and less than a quarter of the power.
And the Zobel circuit is connected with the resistor to the output of the LM386 and with the capacitor to the ground (the opposite as in the tutorial). It doesn't matter the way it is but if it would have been built in the way like in the tutorial, the educator would have realized that the output capacitor is at the wrong net, because only the very high frequencies would have been audible. :D
nice
Hi! I gave this a go with some slight modifications.
I didn’t have a 10k variable so used a normal resistor between pin 3 and audio in.
I used a 100uf electrolytic capacitor from pin 6 to ground
A 10 ohm resistor from pin 5
A .5uf ceramic capacitor from end of the 10ohm resistor to vcc
And a 1000uf electrolytic capacitor in between.
Speaker +ve input connected to negative leg of the 1000uf capacitor.
Anyway when I power it on and hook it up to my 9v batter the volume is really quiet. However when I touch the 100uf capacitor and the ground input the sound amplifies.
Can anyone explain what is going on please ?
I believe what you need is a resistor between ground and the input pin (10k should suffice). Without it, the circuit is "floating", aka it's not properly biased, and will not work correctly.
great and simple build but this can sound even better with a little better and bigger speaker. I made a GREAT guitar practice amp with LM386 and small bass boost. Super easy and great sounding. Is there a schematic for this build? I'd love to compare.
***** I'm trying so hard to find how to make a guitar amp, could you show yours? or how you did it?
Jeyson Ardila I tracked down information about the "Ruby" amp using the LM386. I used this webpage and adapted the "Bassman" mod....so my amp is a RUBY BASSMAN. You can google it or go to this page which was my main source of information.
runoffgroove.com/ruby.html
Hope that helps! :D
***** Thank you so much. I'll let you know how it turns out
Please do. I had a lot of fun with this one. It is also a great way to make a nice bluetooth amp. Just add a portable bluetooth plug thing.
can you give exact specifications of capaciter's voltage and speaker ohm and watt plzz
Well. with that many you can experiment a whole lot, and practice creating a type A amp, type AB, and using two chips in the same setup as this video, (well similar not exactly. The gains, and Volume would need to be connected to both channels, otherwise you'll end up with 4 pots, or 6 if you add bass control.) You can make a stereo amp, as this amp is mono. I'm currently experimenting using these as a first, and second phase amp, using transistors (NPN, PNP, and MOSFETs) as either the preamp or 2nd stage amp.. both seem to work well tbh. I'm sure most real EE would balk at what im doing, but I'm a newb... bahaha. Electronics are really fun once you begin getting the hang of circuit design, and general knowledge of what specific chips/ics/etc do.
Any chance you have a schematic for this circuit to assist in making the connections?
hey. i have a project like this. i am a newbie at this topic. please enlighten me. what electronic configuration are you using?
i used a td2822 ic as amplifier... its sound is very distorted . pls suggest wat shd i do to make it sound better?.
video was very wonderful..but i have list of apparatus used..so that i can easily tries to make it..i m very thankful if u send me list of thing used...
Hello, can i connect dynamic microphone into the this audio amplifier and then amplify the microphone voice?
A+
Can i find a guide on the net, where are alle the parts used for?
What is in funtion of what, an what is compensates what.
Where would you add a second speaker on the breadboard if you wanted it to be stereo?
I have a doubt, what are the differences between an electrolytic capacitor an the green capacitor he put in the 5th pin? Does it have polarity? Can i replace it with an electrolytic capacitor?
Awesome explanation and good use of the LM386 (related ot x86 architecture ? I'm a newbie !) However, use a better speaker, the distortion might be caused by that crappy little thing lol
Also, if I wanted to add a toggle switch, where would it go?
what if i want to add more than one speaker in series or parallel is this amp will work ?
what is the frequency response, input/output impedance of the circuit
Do you have a schematic diagram for the second circuit? That would be easier to read while making the circuit.
+Jadirah Sarmad if you have a schematic diagram plz send me also danishlegacy21@gmail.com i really need it for my project .
i built one like this years ago but i think i used LM741 as preamp and the LM386 , i if i remember right
Can it work only with 386 connected guitar directly to its input ?
when i try to input the audio through phone trrs wire in the frist circuit, red ,blue ,green,gold. can you please tell me which wire ahould go in to potentiometer and which in ground..?
Lol, so many people use the far right pin of the potentiometer for ground, because they live in their schematics, where the ground usually points down. But in this connection the wiper must be turned far right for maximum attenuation, which is usually the position of maximum volume. That's why I design allready my schematics in a way that the potentiometer ground is pointing up.
It is better to use your best hifi speaker awayliable in your home to present the music samples. Most of these chip amps are really sounding good. Only with a very good speaker you can reproduce their full potential. I order to avoid accidential destruction of your speaker you can check that the amplifier output is free of dc.
what effect does the impedance of the speaker has on the output?
While making the first circuit, he connected the last capacitor, that 104 I guess, from pin 4 to positive rail. I think that was a mistake, and he did plugged in to negative in the other part. Now I'm not sure how that worked for him.
What is the signal coming out of the earphone jack? I know its a small signal but how small is it?
Also, if I wanted to add a Bluetooth receiver, how and where would I solder it?