LM3886 Hi-Fi Audio Amplifier Design Tutorial

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LM3886 Hi-Fi Audio Amplifier Design Tutorial
The PCB and schematic project files: easyeda.com/CircuitBasics/LM3...
The LM3886 is probably the most popular chip amplifier in the DIY audio community. And for a good reason. With the right layout and components, you can build a Hi-Fi amplifier that sounds better than some retail amps selling for thousands of dollars. In this video, I'm going to show you how I designed my stereo LM3886 amplifier. First I'll show you the schematic, and explain what each component does. I'll show you how to change the amp's gain, how to set the upper and lower cutoff frequencies of the amp's bandwidth, and use some RC filters that eliminate noise and interference. Then I'll show you the PCB I designed, and give you some tips on laying out an amplifier PCB to avoid ground loops and hum. At the end of the video, I'll wire the amp up and play some music so you can hear what it sounds like...
You can order the PCB or download the Gerber file using the link below:
easyeda.com/order?id=9ee36e22...
The full tutorial: www.circuitbasics.com/design-...
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Пікірлер: 125

@user-kx8qb2ee2m 2 жыл бұрын

This is the best build tutorial for a lm3668 amplifier, hands down. Everything is so well explained in the website. Very good job, thank you for sharing.

@faisalamin1602 5 жыл бұрын

From many years, I was searching for a comprehensive amplifier literature in a practically implementation manner. This is what I needed, specially your elaboratively explained page. Thanks a lot. God bless you.

@ga12f12o 4 жыл бұрын

Perfect layout, the grounding & power is connected in the best way possible !

@xxmeanyheadxx 5 жыл бұрын

4:46am on the clock :D Makes me feel better about being awake all night watching these... Awesome vid brotha

@eatdrinkwineguy 6 жыл бұрын

I've gone over and watched both this video and read your article several times. Thank you for such an informative and concise overview. I was curious if you would ever go into more detail about the power supply circuit and setup. Seems like a very important detail that is often missed or glossed over with a lot of designs yet without the proper design really makes a huge impact on the final output quality. If you ever get a chance that would be great.

@martintendayichirombe4016 7 жыл бұрын

Wow! An elaborately articulated video. Was very informative. Thanks so much.

@josef.torrealba6992 4 жыл бұрын

interesting points ,if anyone else wants to learn about how to make electronic circuits try Sovallo Circuits Expert Fixer (do a google search ) ? Ive heard some awesome things about it and my mate got great success with it.

@carltonwatts3913 3 жыл бұрын

@@josef.torrealba6992 no comments

@AudiophileDIYer 5 жыл бұрын

LM3886, one of my favourite amplifier chip, and I love that Mundorf coupling cap !

@stephenstudley185 6 жыл бұрын

Excellent work! I do hope you continue, I have subscribed. Thank you!

@maxwang2537 3 жыл бұрын

Oh, man! This is simply more than brilliant! Thanks.

@psyolent. 6 жыл бұрын

very informative and well structured. thanks for sharing.

@XSspeeds 7 жыл бұрын

Thank you very much for sharing all this great information, it was very well done.

@markandersonsa 6 жыл бұрын

Really cool work. Nice presentation and pace. Keep up the great work

@garygranato9164 2 жыл бұрын

thank you for explaining what each part of the circuit does

@roverdad 2 жыл бұрын

Just found this now…wow, thanks so much! i’ve been wanting to do this for a while.

@jasonjackson3114 7 жыл бұрын

Excellent video. Much appreciated.

@diegososa4753 4 жыл бұрын

Muchísimas gracias, es muy valioso su aporte. Saludos!! :)

@andymouse 3 жыл бұрын

Very cool explanation, very refreshing, I've subbed !...cheers.

@beck3740 4 жыл бұрын

the best LM3886 video

@InXLsisDeo 4 жыл бұрын

Great design for a power amp that should match or surpass most commercial offerings of the same price or 3 times more expensive.

@adryanyork3581 7 жыл бұрын

That was awesome, thanks

@cobar5342 Ай бұрын

Looks like a great project

@ulf8468 7 жыл бұрын

great video! thank you so much for explainig your circuits. Unfortunately this part often is missing on youtube...

@cuongnguyenquoc6356 3 жыл бұрын

great video!. thank you.

@enricopietraroia5621 7 жыл бұрын

great video... its making me interested to build one :)

@piggybladder 5 жыл бұрын

Nice tute and nice job keeping your grounds separate and routed off the amp pcb back to psu. Bulb tester should be on diyer's Xmas list.

@Shahbs 6 жыл бұрын

Thats a professional design. Love it. Especially the pcb.

@miladinseratlic5984 2 жыл бұрын

how it can be professional design with ground plane on amp pcb?

@Shahbs 2 жыл бұрын

@@miladinseratlic5984 because it is recommended so by the manufacturer. more over, since this ic is an opamp, it have a tendency to pick up so much noises, and that ground can actually act as a sheild

@miladinseratlic5984 2 жыл бұрын

@@Shahbs as far as I know single point ground star is still the best way to go for design of audio amps...?

@davidokon2988 6 жыл бұрын

Nice work

@rehmatali8401 3 жыл бұрын

I like this amplifier it is very easy to implement and cheap

@jipi47 7 жыл бұрын

wow awesome, i look forward for the power supply :)

@adryanyork3581 7 жыл бұрын

Me too ;)

@kevinbeckenham3872 5 жыл бұрын

Look's great project for my P.C sound system.

@Ravindersrajan 3 жыл бұрын

well professional thanks for share

@Dadolaurenovic 7 жыл бұрын

Wow! This KZfaq channel will take off soon! Very well done. I don't suppose you could run through your power supply design in another video? It looks very good and could add a lot to your channel. Daniel.

@sausagesausage7976 6 жыл бұрын

Finally, I’ve stopped scratching my head regarding the ground plane malarkey! Probably the most valuable material I’ve found to date along with the info on the diyAudio page. Yes, please do a power supply tut! Thank you soooooo much!!!!!

@piggybladder 5 жыл бұрын

Look at p2 of the schematic on post #1 of Mauro Penasa's LM3886 amp thread 'My "audiophile" LM3886 approach' at DIYAudio. It includes speaker protection, start up delay relays etc. www.diyaudio.com/forums/chip-amps/54571-audiophile-lm3886-approach.html.

@arimepiledbackpack 5 жыл бұрын

nice work！！

@ruijorgemoreno Жыл бұрын

Hi, very in depth video. Thanks! What suggestions would you give to make a 2.1 design based on the 3886?

@davidokon2988 6 жыл бұрын

Wow! Create work

@alexandercyborg5308 Жыл бұрын

Thank you..

@budandbean1 7 жыл бұрын

With the size of your heat sinks, do they get warm? Did you try to run this on full amplification and check power consumption? You had said that the amplifier circuit was based on the schematic in the paperwork of the chip. Where did the power supply schematic come from? Thanks!

@friedmule5403 6 жыл бұрын

About your twisted wires, I once read a science magazine where they postulated that it was only at two wires that twisting had any positive effect, that by i.e. tree the effect was near to zero.

@pauloroberto-fg5py 6 жыл бұрын

Congratulations on your project, are these modifications for better quality sound? Sorry, I still do not understand English well, here in Brazil I did not see any better about this LM3886, I will continue following the channel.thanks!

@ga12f12o 4 жыл бұрын

You can change R1=2K ; R4=22K ; C2=330pF. This should keep bias current the same in LM3886. C2 is recalculated for same high frequency cutoff

@ladjkaoz 2 жыл бұрын

nice amp, i read this IC can make 68Watts RMS is it true. looking to build some to replace the ones that went bad in my pioneer monitors. im looking for 100+50 RMS since my monitors are Biamp. thanks great video. I like how you explain the input gain etc...👍👍

@deniz17293 2 жыл бұрын

Great video very helping, but I can't see the inductor on the PCB Layout? It was on the circuit design

@SoundsGur 6 жыл бұрын

what a great explanation, thank you very much for your efforts! and your blog is very helpful, that's just the kind of article I was looking for. I do have some questions though - say I want to built a 4-way system with an amp channel for each driver. Knowing that at the input stage of the amp there's a hi-pass and low-pass filters, would it be smart to use the drivers' filters instead and save up on extra components later on, which would have added their self noise to the signal? I could use a potentiometer on the resistors that set the cutoff point, adjust it while the system it working to find the value I want and then replace the potentiometers with matching value resistors.

@SoundsGur 6 жыл бұрын

That would also focus the amp on amplifying only the signal I want it too, not wasting watts on frequencies I would then have to filter out anyway for each way of my system. Does that make sense or am I missing out on something?

@MyBigThing2010 7 жыл бұрын

so this is a better option than the tda1521? or no? ...thanks! ...love the channel btw...SUBBED and have been binge watching and clicking ads for you ;)

@GenerationXT 6 жыл бұрын

Mouser and Digikey both have 19K resistors. Examples would be the dale RN65E1902BB14 and the Yageo MFR-25FBF52-19K1 (actually 19.1K).

@AmbiguousAdventurer 3 жыл бұрын

Circuit Basics website comment seems to be broken. I can't leave reply without answering a non-existing captcha. Please fix =). Awesome tutorials! Could you make one on SMPS and noise filtering/capacitance multiplier calculation etc?

@dedskin1 5 жыл бұрын

Hi , great vid , i have a problem with a Mono board of these , it burned up a Tweeter , so i changed voltage regulators , power diode and one out of 3 LM ICs in AMP board , and now it turned on but i get buzz and 40V of DC voltage on outputs , also i have a short on 3 out of 4 outputs , maybe 2 , its bi amp for tweeter and and bass so it has 2 amps in one channel , i dont know what is the problem , cant find it

@brannonmcevers1854 2 жыл бұрын

I have a question. Does your design exhibit a low amplitude, low frequency 'motorboat' like oscillation when powered on and no input signal present? I've lately been trying to implement a parallel LM3886 design of my own and have been struggling with this issue. I am not using a ground plane as in your design. I have tried several different bypass capacitor configurations but I cannot tame this oscillation. Any help is much appreciated thank you for your informative video and website.

@anitechz1821 6 жыл бұрын

Thank you sir How to calculate the trace

@cekpi7 6 жыл бұрын

What voltage caps should i get? I can see that most of yours are rated at 50 and 63V so i should get values over single rail voltage? Also is there reason you choosed that big 4.7uF cap?

@ionut5350 4 жыл бұрын

You definitely need the caps to be above the rails, since this amplifier doesn't have a regulated supply it's a good idea to go about twice the rail voltage (i.e 28v per rail in this case means 63v rating is safe and sound) also it's good to use film caps in the signal path as electrolytic types like to drift and/or create distortion.

@DandyDon1 2 жыл бұрын

A church organ manufacturer I use to do service for used, the LM3886 in their amplifier module design for over a decade I think. Their circuit design is a bit more elaborate I think.

@abhijithalder4567 5 жыл бұрын

Can u prepare a video to design a class ab power amplifier from scratch describing various functional block that makes a complete amplifier using transistor....then that will be great as no such video currently available where we can get required theory along with the practical circuit and hearing experience. ... thank u....great job

@piggybladder 5 жыл бұрын

Search for books by Bob Cordell and Douglas Self. There isn't just one topology for an ab amp (or any amp). Some are designed to use current feedback, others for voltage feedback. There are so many 'functional blocks' some get used, other omitted according to the specific designer's goals.

@abhijithalder4567 5 жыл бұрын

Thnks 😊

@pratikthacker 7 жыл бұрын

could u plz make a video on connecting load sensor to raspberry pi and measuring weight?....

@ronen124 7 жыл бұрын

without reading the datasheet, R3+C4 look as if they are LPF connecting the feedback loop to ground

@danielmusat597 2 жыл бұрын

I am sorry to correct you about this but the GND connection on LM3886 should be connected to low noise ground area. If you look in the datasheet of this chip this internal GND connects the input stages of the current mirror to a fixed potential. Correct me if I'm wrong, please.

@gman76utube 7 жыл бұрын

I never thought of using a zener and RC on the mute pin. I'm designing a bi-amp active crossover (LR4) that uses four 3886's and recently discovered the output has a large DC offset as the power supply decays at power down. Does the mute pin ensure a clean thump-less turn off?

@kevinlivingston9563 6 жыл бұрын

gman76utube did you ever find out? I'm building a small tri amped system and I get a bad thump.

@caglaroral 7 жыл бұрын

Power supply design please!!!

@kursatcantelli8331 5 жыл бұрын

brader amfi design tutorial izleyen adam power supply mi sorar xd

@souvikpramanik5183 5 жыл бұрын

Sir what biasing voltage should i provide to the circuit & where should i put the treble box of 5w there as there is only one output port

@blissed4700 Жыл бұрын

It's been four years since this was posted and I wonder why the guy hasn't included that information. Did you ever find out the voltages? Please let me know, Thanks

@HafeeezBhutta 5 жыл бұрын

What is the copper thickness of amp and power supply pcb?

@michaels6786 6 жыл бұрын

May I ask, @ 3:23, shouldn't the formula r3=(av-1)/r4 actually be r3=r4/(av-1)? I keep getting r3=.001 ohms with the given formula.

@d4dbeh 4 жыл бұрын

why does c5 in the mute circuit must be 63volt? is it necessary?

@acharyaguy 3 жыл бұрын

Is this chip suitable for building bluetooth audio system ?

@junchabeseu9007 6 жыл бұрын

How can i use that in 12v battery.. can you please teach me how to do it?

@tonsingmuan 4 жыл бұрын

I have ordered this pcb using your gerber file without cross checked the design, now pcb arrived. Missed R4 component in the pcb

@RaisingAwesome 3 жыл бұрын

Does anyone have a link to a power supply for these amplifiers?

@TheAmitkhandekar 3 жыл бұрын

My LM 3886 is getting hot very much. What should I do. Just made a mono circuit. If one board works , then only I will make a stereo. Please let me know why my IC is getting unbearably hot.

@Rienck 7 жыл бұрын

at 5:55 you talk about a network. I can't understand what you exactly say. What's the network called?

@benedictnothing 7 жыл бұрын

Did some Googling, and I think it's "Zobel network". This is one of those American accents I find hard to follow. Too fast and croaky for my UK ears! Very informative, nevertheless.

@Rienck 7 жыл бұрын

Thank you very much!

@sirbescugeorge1429 7 жыл бұрын

Pcb design on request?

@amitprajapati2847 7 жыл бұрын

what is the difference between TDA2030 amplifier and LM3886 amplifier ? IS there any difference in sound quality?

@weenieslayer 7 жыл бұрын

looking at the datasheets i can tell you that the tda is a 14 w amp and the lm is a 65 w amp

@amitprajapati2847 7 жыл бұрын

oh! thanks

@weenieslayer 7 жыл бұрын

Amit Prajapati no problem! but what i gave you was just a short answer, if you want to find out more just google tda2050 datasheet and lm... datasheet, put them side by side and compare

@amitprajapati2847 7 жыл бұрын

okkk

@molozakos4084 6 жыл бұрын

hello Sr, the Frequency sesponce is from what start ,CIRQUITS BASICS to the END OFF WHAT Frequency ,please for example some audio ampl/s says = from 20HZ to 20 KZ . this what gives Sr. ???? i want one something diferent clever for small frequencys. from 0HZ -OR 1HZ TO 70 KZ OR 85,90KHZ . ORE IF IT IS POSIBLE TO MAKE IS= 100khz. because that for more its imposible to saxid. from my electrinc frends. 85 KHZ says with ic chip this yours is beatiful audio . i hope to look like you in the fututre . and now to the present WHAT FREQ. sesponce-resolution has for out put ?from 30HZ to 25KHZ? OR THE OPPOSITE 300HZ TO 25MHZ, THANKOU GEORGE .MOLO

@beatsbyjocka4012 7 жыл бұрын

what class is this amp?

@gman76utube 7 жыл бұрын

@nantrix1 2 жыл бұрын

can i use 24 0 24 transformer?

@miladinseratlic5984 2 жыл бұрын

24 VAC? x1.44 = ~ +/- 35 VDC, LM3886 have supply range up to 94 so +/-35VDC = 70V, you can use it. At that voltage supply and 8ohm speaker u get 50W output power.

@ashlarxxx 5 жыл бұрын

Can I use LM3886 as a solid-state guitar amp power amp?

@CarpeDiem23 4 жыл бұрын

Yes you can , I did

@TheRealColBosch 5 жыл бұрын

To balance R1+R2 to R4, why didn't you just add another 1k resistor in series with R4's 20k?

@ahmetserdr2920 5 жыл бұрын

TheRealColBosch i think he made mistake that part. feedback loop resistors must be in parallel like input resistance when we are setting to minimize input offset voltage. there was a mistake.

@TheRealColBosch 5 жыл бұрын

@@ahmetserdr2920 I see, thank you.

@kursatcantelli8331 5 жыл бұрын

Can you be more spesicif about that? cause i still didn't get it :/

@kishonkashwini5401 6 жыл бұрын

How many watts and ohms pls tell anyone

@donrutter6765 6 жыл бұрын

KISHON KASHWINI 3000 watts @ 2 ohms.

@CarpeDiem23 4 жыл бұрын

How many wats is output of 3886?!

@buddhistsympathizer1136 Жыл бұрын

Up to 68W into a 4 ohm load with a +/-28V supply

@AbhishekKumar-mq9qf 3 жыл бұрын

Hello sir Can we give voltage upto 35v in this circuit? Please reply ASAP

@TheAmitkhandekar 3 жыл бұрын

Hi Abhishek . What kind of transformer you are considering for power supply. Toroidals are too expensive. Basically this two separate pcb needs two different supply..

@stealerstyle7844 7 жыл бұрын

@wolidhassanbadol4045 Жыл бұрын

SONY DXA-C70 Transformer AC 27 0 27....yes/ no....LM 3886....place tel me

@sirajuddinkhantalukdar786 Жыл бұрын

power supply vdo is pending

@technicalkk4986 7 жыл бұрын

4.7 cap rating

@AmokRun666 3 жыл бұрын

lm3886 and tda7293 if they had a power supply of 1Farad for each channel at +-29 volt will f**k up any hi-end amplifier that cost more than $5000.

@nuyfuttee1533 2 жыл бұрын

@miladinseratlic4565 4 жыл бұрын

Well, NO ground star design but ground plane instead so I'll SKIP this one...

@ionut5350 4 жыл бұрын

Why does it matter? It's star grounded at the power supply anyways, it's a good layout and it's well protected from interference

@ga12f12o 4 жыл бұрын

His layout is as good as it can get, star grounding should be at the power supply for lowest impedance, also he keep signal currents and larger currents separate

@user-StefanSanches Жыл бұрын

High-frequency board tracing is not good for audio!!!!

@ironpark4042 6 жыл бұрын

LM3886 CANT BEEEE HI-FI

@petergaal7012 4 жыл бұрын

Ok. But why? What are the exact properties that are missing from it to be hi-fi. Are there any hi-fi audio amplifier ic out there?

@chrishuhn5065 Жыл бұрын

Too bad you can't buy the bloody chip anywhere. Digikey has 0 in stock, Mouser shows it's available in October 2023!! AliExpress has a cheap kit, but says it can't deliver to my location (or any othe location I select). My lcal suppliers list it, but also show availability sometime around 2023. Goddamnit. Thanks war mongers. Thanks embargos. Thanks for nothin'.

@nelsondog100 Жыл бұрын

I’m sure somebody’s got a secret stash of those sitting on a shelf collecting dust. Heck, I’ve even got a small stash myself. Ask around in the forums. I’ve seen them for sale on the DIYAudio swap meet pages a little while back…

@chrishuhn5065 Жыл бұрын

It's getting even sillier. Mouser changed their expected arrival date to January 2024. AliExpress sellers charge 30 bucks and up per chip. Then you see listings for amplifier modules for less than half that - but they are sold without the actual chip, only connectors, resistors and the caps are soldered in. F this. I'm gonna find me something else to pass the time with.