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.
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.
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.
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!!!!!
@@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
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
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.
Wow! This UA-cam 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.
A little time has passed since you posted the video. I would like to have two boards made according to your layout. However, your link to the boards leads to a blank JLCPCB website. Where can I find the Gerber files ..or do you have any spare boards left? Many thanks for the excellent tutorial!
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...👍👍
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.
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.
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
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!
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?
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.
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?
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.
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.
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.
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?
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
Hi Sir, this is Krishnamurthy Bhat from Bangalore INDIA Best build tutorial....i want to build... I am requesting you please share the Gerber files and components PDF ... Thank you
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!
Hi guys. Basic question. How does volume on iphone relate to output power or even dissipated power on the heatsink. Meaning if volume is low, chip shouldnt heat too much as compared to when volume is all the way up.
I reserached a bit. Seems volume on iphone (similar to volume knob for analog counterpart) will change the input signal voltage, and so will the output voltage to the speaker, Vo^2/R, changing the output power to the speaker.
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?
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.
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.
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 ;)
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.
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
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.
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..
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
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
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'.
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…
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.
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.
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.
Perfect layout, the grounding & power is connected in the best way possible !
4:46am on the clock :D Makes me feel better about being awake all night watching these...
Awesome vid brotha
Wow! An elaborately articulated video. Was very informative. Thanks so much.
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.
@@josef.torrealba6992 no comments
Great design for a power amp that should match or surpass most commercial offerings of the same price or 3 times more expensive.
thank you for explaining what each part of the circuit does
the best LM3886 video
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!!!!!
Thats a professional design. Love it. Especially the pcb.
how it can be professional design with ground plane on amp pcb?
@@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
@@Shahbs as far as I know single point ground star is still the best way to go for design of audio amps...?
Just found this now…wow, thanks so much! i’ve been wanting to do this for a while.
Hi, very in depth video. Thanks!
What suggestions would you give to make a 2.1 design based on the 3886?
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
Great video very helping, but I can't see the inductor on the PCB Layout? It was on the circuit design
Oh, man! This is simply more than brilliant! Thanks.
LM3886, one of my favourite amplifier chip, and I love that Mundorf coupling cap !
Looks like a great project
Very cool explanation, very refreshing, I've subbed !...cheers.
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
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.
Thnks 😊
Wow! This UA-cam 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.
Muchísimas gracias, es muy valioso su aporte. Saludos!! :)
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.
great video! thank you so much for explainig your circuits. Unfortunately this part often is missing on youtube...
Thank you very much for sharing all this great information, it was very well done.
very informative and well structured. thanks for sharing.
Excellent work! I do hope you continue, I have subscribed. Thank you!
I like this amplifier it is very easy to implement and cheap
Really cool work. Nice presentation and pace. Keep up the great work
What about a single supply version? What needs to change? Thanks.
A little time has passed since you posted the video. I would like to have two boards made according to your layout. However, your link to the boards leads to a blank JLCPCB website.
Where can I find the Gerber files ..or do you have any spare boards left? Many thanks for the excellent tutorial!
Excellent video. Much appreciated.
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...👍👍
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.
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.
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
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.
Mouser and Digikey both have 19K resistors. Examples would be the dale RN65E1902BB14 and the Yageo MFR-25FBF52-19K1 (actually 19.1K).
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!
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?
wow awesome, i look forward for the power supply :)
Me too ;)
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.
great video!. thank you.
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?
gman76utube did you ever find out? I'm building a small tri amped system and I get a bad thump.
at 5:55 you talk about a network. I can't understand what you exactly say. What's the network called?
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.
Thank you very much!
great video... its making me interested to build one :)
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.
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.
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?
well professional thanks for share
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
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
Hi Sir, this is Krishnamurthy Bhat from Bangalore INDIA
Best build tutorial....i want to build... I am requesting you please share the Gerber files and components PDF ...
Thank you
Does anyone have a link to a power supply for these amplifiers?
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!
could u plz make a video on connecting load sensor to raspberry pi and measuring weight?....
That was awesome, thanks
why does c5 in the mute circuit must be 63volt? is it necessary?
Thank you sir
How to calculate the trace
Hi guys. Basic question. How does volume on iphone relate to output power or even dissipated power on the heatsink. Meaning if volume is low, chip shouldnt heat too much as compared to when volume is all the way up.
I reserached a bit. Seems volume on iphone (similar to volume knob for analog counterpart) will change the input signal voltage, and so will the output voltage to the speaker, Vo^2/R, changing the output power to the speaker.
without reading the datasheet, R3+C4 look as if they are LPF connecting the feedback loop to ground
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?
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.
What is the copper thickness of amp and power supply pcb?
How can i use that in 12v battery.. can you please teach me how to do it?
Nice work
Is this chip suitable for building bluetooth audio system ?
I have ordered this pcb using your gerber file without cross checked the design, now pcb arrived. Missed R4 component in the pcb
You will connect 20k 1/4w between the 3rd leg and the 9th leg of the Lm3886 integrated circuit.
nice work！！
Power supply design please!!!
brader amfi design tutorial izleyen adam power supply mi sorar xd
can i use 24 0 24 transformer?
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.
Look's great project for my P.C sound system.
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 ;)
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.
Hi. Maybe your heatsink was not big enough?
I NEED LM3886 TF IC
what is the difference between TDA2030 amplifier and LM3886 amplifier ? IS there any difference in sound quality?
looking at the datasheets i can tell you that the tda is a 14 w amp and the lm is a 65 w amp
oh! thanks
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
okkk
To balance R1+R2 to R4, why didn't you just add another 1k resistor in series with R4's 20k?
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.
@@ahmetserdr2920 I see, thank you.
Can you be more spesicif about that? cause i still didn't get it :/
How many wats is output of 3886?!
Up to 68W into a 4 ohm load with a +/-28V supply
Pcb design on request?
what class is this amp?
AB
Hello sir
Can we give voltage upto 35v in this circuit?
Please reply ASAP
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..
Wow! Create work
How many watts and ohms pls tell anyone
KISHON KASHWINI 3000 watts @ 2 ohms.
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
Thank you..
SONY DXA-C70 Transformer AC 27 0 27....yes/ no....LM 3886....place tel me
power supply vdo is pending
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.
4.7 cap rating
High-frequency board tracing is not good for audio!!!!
C3
Well, NO ground star design but ground plane instead so I'll SKIP this one...
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
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
Gj
LM3886 CANT BEEEE HI-FI
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?
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'.
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…
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.
Why 22 minutes? It is 10 minuts maximum for this kind video, boring.