LM386 Audio Amplifier Circuit With Bass Boost and Volume Control

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This electronics video tutorial provides a basic introduction into the LM386 Audio Amplifier circuit with contains a bass boost feature and uses a potentiometer for volume control. The LM386 Op-Amp also has a gain control feature when pins 1 and 8 are used. The voltage gain can be increased from 20 to 200. The bypass pin 7 must be connected to ground using a capacitor for this feature to work properly.
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Опубликовано:

25 июл 2024

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Комментарии : 78

@TheOrganicChemistryTutor 5 месяцев назад

Final Exams and Video Playlists: www.video-tutor.net/ Full-Length Math & Science Videos: www.patreon.com/mathsciencetutor/collections

@jayatiroy4407 4 года назад

He teaches everything!!! You should be the everything tutor

@HelpMeReachsubsWithoutAV-kg1ry 4 года назад

This is a simple vid no intro no background sound and behind this video there's a genius and gifted man

@MrPaulstrivens 3 года назад

Making a amp to play harmonica through, have made a few with LM386 but really need to increase the bass to get that bluesy sound. Enough tips in this video to explore different options. very clear explanations what is going on in the circuit even for a dunce like me, excellent and clear instructional video.

@martynharveythepoet5114 2 года назад

Possibly the BEST tutorial on the LM386 I've seen! Thank you!

@anisarif2605 Год назад

❤❤

@sefalibhakat143 4 года назад

You are great! I like that you are teaching this topics also. Next time please constant current source/sink . Class ab output stage and everything.

@pastel114 2 года назад

Fantastic video, built a nice practice guitar amp for me and my homie. Your physics videos were great and these circuit videos are very helpful and interesting as well.

@simonlinser8286 Год назад

this guy is the best tutor in the world!

@PunmasterSTP 2 года назад

Volume control? More like "My learning is on a roll!" Thank you again for this wonderful playlist.

@robertheselwood4207 2 года назад

Excellent video and tutorial for a beginner like me. Thanks

@rudinei_do_conto Год назад

Owww I'm from Brazil. Tank you for video, is the best video for Lm386 in all internet.

@sqrt-1646 4 года назад

I thought this was supposed to be organic chemistry, but I like it.

@meshakbinu4807 2 года назад

Excellent Explanation ! It was awesome !

@desmondantony1136 4 года назад

Really very helpful and clearly explained.

@hrig8729 3 года назад

You explain very well sir!

@martindoyle766 8 месяцев назад

It worked great I've just added a 2.7 polyester film capacitor between the center pin of the potentiometer and pin 3 of the ic this stopped any DC offset on the input a second coupling capacitor I hardly have to turn the amp up at all to get great volume now it also seems to be sharper and more powerful

@bassblom 3 года назад

thanks for this very clear video!

@propagating-radio 3 года назад

Fantastic video! Thanks for sharing

@Hematite-Heart 4 года назад

I’m trying to learn circuitry so that I can play and create some electronics. Do you have a collection of your circuit/electric videos?

@adityaoke2824 3 года назад

Awesome, thank you so much.

@abioladivine-peaceokikijes1657 Год назад

Thank you so much, please can I connect 2 8-ohms speakers to the same amplifier circuit

@shahryarpasyar1481 Месяц назад

Very Nice Explain and Usefull,Thanks

@jasonf9910 4 года назад

Great vid.

@knowthrvdo 8 месяцев назад

Fantastic video

@vs68s39 4 года назад

R1controls volume but does 't gain also control volume..is a high gain used with low voltage input signals but limited so as not to blow the speaker. Tx

@TheArtofEngineering 2 года назад

Great video as always!! But it is CUP ling not coopling?

@franciscochaparro-torress5010 4 года назад

Hello. Thanks a lot for your great videos. I like the simplicity and quickness of your videos. May I know what software or program do you use for your videos?

@gammersunity4117 Год назад

nai

@williambourn4799 9 месяцев назад

LTspice

@DrMasi 4 года назад

Good job

@martindoyle766 9 месяцев назад

Awesome circuit man can you make it stereo using that chip ?

@patprop74 Год назад

Not that I am complaining, Only an observation or a suggestion if you will, What would have made this video so much better than every other video was if you breadboarded out and test and showed the results of your schematic at the end of the video.

@jaikrish50 3 года назад

May i know the which software is this you are teaching

@mikelee1906 Год назад

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.

@jayjoseph2890 2 года назад

EXCELLENT!! 👍

@chicho797 3 года назад

nice job !!

@jaikrish50 3 года назад

Wow Amazing

@vivekbabubanasuri3764 2 года назад

Can we vary the frequency using potentiometer?

@allmight801 4 года назад

hello can somebody help me create block cheme for telegraph, landline phone and mobile phone telecomunication system or at the very least somewhere were i can find it thank you

@billalkhan.chowrasta1563 3 года назад

How to compare gain,sir?Like if gain is less than 20 then room is small & for high than 20 then room size is big?

@chgjay 4 года назад

thanks!

@wizarmatic 3 года назад

Thanks for the explanation. What are the list of jobs can you can get making circuits like this?

@simonlinser8286 Год назад

none unless you live in 1970

@vivekbabubanasuri3764 2 года назад

Can we connect earphones instead of 8ohm speaker? Please reply sir

@jorgelima5695 4 года назад

If you folks want to learn more about the use of this device, go to the source: www.ti.com/lit/ds/symlink/lm386.pdf

@larryshaver3568 3 года назад

is there an LM386 that has an output of 1 watt? I thought there was

@TheDradge 2 года назад

Is there a mistake in your video? You start by saying that a 1,000uF capacitor gives a reactance of 1.59 ohms at 100Hz and shortly after you say that it is 15.9 ohms (this is at the 5:20 mark).

@peterrossi6462 Год назад

What if I want to amplify low frequencies without attenuating high frequencies? It seems like your methods for boosting the bass don't actually boost the bass, they just lower the treble volume.

@robertheselwood4207 2 года назад

I put together the circuit you did at 14.40 mins , but all I get is a kind of low tone to high tone whistling noise , then when music is playing to to through it it sounds like a scratching sound. I tried a 100uf and a 47uf capacitor on pin 7 but it was still the same. Any ideas as to what may be wrong. Thanks

@himmler200587 Год назад

Connect a 100nF cap in parallel to the 1000uF cap at the out put. IMPORTANT: connect it in parallel; it will filter all the high frecuency unwanted noise

@archivedaccount2049 4 года назад

Legend

@abelneftali1 4 года назад

How can I get a cleaner sound output, I mean without distortion?

@adnanahmadknowledgevideo 3 года назад

Connect a bypass capacitor of 100uf between pin 7 and ground. If still there's a noise distortion then connect a 1000uf capacitor to the input of the circuit which will reduce the noise caused by input power supply also add a 0.1uf or 100nf capacitor to the output and the ground. This will definitely reduce the noise distortion.

@joeltomlinson4421 2 года назад

What is the drawing software for this video? I use Microsoft whiteboard, but I do not care for it.

@greg_f298 3 года назад

thanks for the great videos...but, potentiometer = poe-tent-chi-ohm-eater and coupling = cup-pull-ing .

@michaelgovers8036 3 года назад

Thank you for swinging education my way, what is the value of R1?

@Joshua-kt5by 3 года назад

R1 is a potentiometer, or volume knob if you’re a layman. I’d use a 10k audio taper volume knob for this circuit.

@michaelgovers8036 3 года назад

@@Joshua-kt5by Thank you for your feedback :) it is much appreciated.

@Joshua-kt5by 3 года назад

@@michaelgovers8036 Don’t mention it! :)

@adnanahmadknowledgevideo 3 года назад

You can use a 10k Potentiometer

@abdelkareemal-shboul6366 Год назад

So my question is :- To increase the gain of the IC386 audio amplifier, which one of the best answer? A- the resistance between pins 1 and 8 must be increased B- the resistance between pins 1 and 8 must be decreased C- the capacitance between pins 1 and 8 must be increased D- the capacitance between pins 1 and 8 must be decreased THANKS

@mikelee1906 Год назад

E - connect a wire between pin 1 and 8. You will achieve 200 times gain.Capacitor adds stability. Potentiometer lets you vary it between 20 and 200.

@jorgelima5695 4 года назад

The math behind the choice of the output capacitor is meaningless if you don't relate it to the impedance of the load (speaker) and determine the attenuation caused by the impedance of that capacitor at a given frequency.

@raine4214 2 года назад

Would it be possible to wire a potentiometer to a lm386 chip module as an external volume ?

@Twiggs8121 2 года назад

If you put a Pot on the positive terminal and have the input signal going to that pot, you'll be a able to adjust the voltage/volume before it gets to the LM386. Check page 8 of the Datasheet for more information.

@raine4214 2 года назад

@@Twiggs8121 very cool, thank you!

@anirudhsanthosh2532 3 года назад

Why is C3 given the value 0.033uf? Why can’t it be a greater value ? Anyone ?

@adnanahmadknowledgevideo 3 года назад

If you increase C3 greater than 0.033uf then the bass increases by a little bit and hence the volume or gain decreases by a small amount. You can experiment by replacing the 0.033uf with 0.1uf.

@electricalnoobject5011 3 года назад

Im sure sir, you are an engineer.... But you love chemistry......

@richardredic 9 месяцев назад

Please, not "coopling" but "cupling" for coupling

@adriandavies6080 Год назад

5 minutes in you got 100hz at 1.59 ohms and 100hz at 15.9 ohms?

@martindoyle766 9 месяцев назад

When I finished the circuits I always cover everything with hot glue this makes the circuit water proof stops connections working loose helps stop interference from coils and other components once done it's done forever just thought I would pass on this tip

@jorgelima5695 4 года назад

Why do you call the LM386 an operational amplifier? It is not. The datasheet describes it as "Low Voltage Audio Power Amplifier ". And indeed its specifications are totally different from those of an operational amplifier.

@FlyTJ 3 года назад

Some call it an op amp as you can configure the lm386 as an op amp as well.

@attilarivera 3 года назад

👏👏👏👏👏👏👏👏👏👏👏👏

@richardredic 3 года назад

It isn't a potenCH-o-meter, it's a potenCH-ee-AH-meter.

@frankreiserm.s.8039 3 года назад

I am building an old Elenco AM/FM radio kit and connected a ceramic disc capacitor to the LM386 in my circuit to prevent the chip from oscillating. You are like me; you know a lot about every topic in science. I have a Master of Science degree in biology and a vocational diploma in electronics and work experience in botany, chemistry, microbiology and electronics. Watch my geology videos by typing in Frank Reiser M.S.