Simple LM386 Amplifier howto!

[kilatadahein]

what is the use of the voltage regulator?

[thenameless615]

Thank's for the video! Will a 10 uf 50v capacitor boost this to 200?

[holycrapapie]

@thenameless615

Finally, a non-stupid comment.

Anyways. I don't know all the specs, but they're easy to find at sites like alldatasheet or datasheetarchive (dot com, can't type URLs in comments.)

[thenameless615]

@holycrapapie Thank's. I have already found that they need 10uF capacitor, but there is nothing said about the voltage. I have both 10uF 25v and 50v capacitors, can't try them myself because I haven't received my LM386 yet. I guess I will have to experiment then.

[holycrapapie]

@thenameless615

The voltage rating on a capacitor is just how many volts it can take without exploding. Any voltage rating > VCC will work.

[2cooliobeans]

@thenameless615

would u put the capasitor on pin 1 and 8?? idk so if u could tell me and which ones to - and+?

thx

[thenameless615]

@2cooliobeans there is a datasheet in video description, everything is described there...

[kecakkicik]

Thank,s broo...

you give me sollution...

If you have a time, pliss make amplifier with Chip TDA7053..

thank's....

i'am from indonesia..

[Protoproff]

You could try using a LM386N-4 should give yoy a bit more output rated @700mW, just an idea.

[jarheadwithm16]

For some reason every time I try to make an amplifier using a LM386 IC it never works. There has got to be something that I am missing....

[luketricity]

great vid :)

what if i use a 6v battery is that ok

plz awnser

[holycrapapie]

@luketricity

6v is fine. Depening on the type, a 386 can work with voltages as low as 4 or 5 volts.

[themanfromwem]

Have you ever thought about a career in comedy ?? Howard.

[holycrapapie]

@themanfromwem

Not really, I'm thinking engineer. Why?

[themanfromwem]

@holycrapapie i FOUND YOUR UPLOAD EXCELLENT, AND MADE ME laugh, the music went along with the project and put the FUN back into electronics. In the UK we have lots of engineers on the TV who like to joke about what they are doing ( google "Scrapheap Challenge")...

well done, no offence intended, yours, Howard.

[NTComputer86]

how loud/how many watts is this? I am trying to amplify a voice changer for my robot suit but im not sure if this would make it louder. i can barely hear it with the radio on normal volume

[holycrapapie]

@NTComputer86

Unfortunately, this thing isn't very loud. The default gain is 20dB, but a capacitor between pins 1 and 8 can pull this all the way up to 200dB. Also, a robot costume sounds freakin' awesome!

[jbpharis0594]

@holycrapapie what type of capacitor?



[holycrapapie]

@jbpharis0594

I think a big old electrolytic can works.

Experiment!

[drobinray]

is it possible to use 12volts without 5 volts regulator??

[dsarmbrust]

Your '8 ohm' speaker says 4 ohm on it...

[Geniusbass1]

nice

[redresonance02]

@holycrapapie can i substitute that microchip to other chips? and that transistors too?

[holycrapapie]

@redresonance02

There are some other chips that would work, but the pinout would be different.

That's not a transistor, it's a voltage regulator.

[Prohl84]

Awesome; i'm new to electronics and i couldn't get some of the more complex schemes. This video got my amp working and gave me enough understanding to add some pots and caps. Soon I will have a talkbox.

[holycrapapie]

@Prohl84

Talkboxes are really cool! Be sure to upload a video of it!

[ExplosiveAnyThing]

you use different speaker and different battery :P

[mkerbker]

making mine right now!

[Thercflyer96]

hey i dont know what my speakers are rated, could i just try anyway or what would be the steps for that

[holycrapapie]

@Thercflyer96

If you have an ohmmeter, I'd recommend checking your speaker first.

Or, if you're feeling adventurous, go for it!

[Thercflyer96]

@holycrapapie yeah i dont have one of those, but i just wired the headphone jack as you said and then plugged that in with the wires just directally to the speaker and bada bing i have music!

[gelpgimLa22]

I did the same circuit, but instead of using a 9v battery with a 7805 use a direct power supply was 4.5 V at 1 A, but no sound and the speaker produces only mild sinusoidal waves also heats the LM386, will not know why?? Greetings!

[holycrapapie]

@gelpgimLa22

I have no idea why, sorry.

[gelpgimLa22]

@holycrapapie No problem!

[mkerbker]

out of all the videos ive seen on this topic, this one has got to be the best when it comes to explaining the knowledge behind it.

[holycrapapie]

@mkerbker

Why thank you, I'm glad you liked it!

[MATILLEGE]

this is probably a dumb question but can i do this with an lm358?

[holycrapapie]

@MATILLEGE

That's not a dumb quesstion.

I think you can, but the pinout will be different.

[MATILLEGE]

@holycrapapie thanx for help

[AlphaMaleRyan]

@holycrapapie hmm.. Thanks, the speaker was 8 ohms, could it just be my bad soldering?

[holycrapapie]

@AlphaMaleRyan

try going without the 7805

[AlphaMaleRyan]

Made it... One question, my voltage regulator was heating up like CRAZY, to the point where I couldnet touch it, is this normal?

[holycrapapie]

@AlphaMaleRyan

I don't think it is, no.

You should check for shorts, get a higher ohm speaker or maybe the 7805 or 386 is borked.

[yowillyjj]

I was actually able to hook some humbuckers up to the LM386 and I have an electric guitar with a built in speaker ...cool

[holycrapapie]

@yowillyjj

Sweet, show me!

[poetdragon]

can I use 2 AA batteries?

[holycrapapie]

@poetdragon

The different iterations of the '386 have a voltage range from 4 volts to 18, so you'd need at least three 1.5v cells

[AlphaMaleRyan]

@holycrapapie thanks :)

[AlphaMaleRyan]

Well, That didn't help

[holycrapapie]

@AlphaMaleRyan

If the datasheet was poorly written, feel free to google.

[AlphaMaleRyan]

cool! how many watts does it put out? thanks in advance :)

[holycrapapie]

@AlphaMaleRyan

seriously, check the description.

[Emiliog23]

hi this very cool I built to amplify my guitar but does not give much volume, there will be some way to increase power?

greets from argentina

[holycrapapie]

@Emiliog23

I'm happy you liked it!

Read the other comments, there's a lot of answers there

[emihackr97]

Hey, ur not usig ur voltage regulator correctly, it needs 1 pin to V+ (Vin), another to V- (Gnd) and another to ur device (Vout).

[holycrapapie]

@emihackr97

Would you people shut up already?

I answered this several times already, AND mentioned it in annotations!

Go away.

[riky22lou]

i am a newbie, bro, i have just started to like electronics some days ago, man

[riky22lou]

bro, what about using microphone to take sounds and

directly amplify it into earphone, man, it will be

cool, what do u think, man, i got this link as well,

ur video inspired me to google it.

redcircuits. com//Page38.htm

what do u think about this circuit, man?

[holycrapapie]

@riky22lou

That might be cool, or just make a screaming feedback loop.

Why don't you try it?

[KJT930]

did it actually make it louder,

[coilsinamotor]

u didn't set the gain pins

[holycrapapie]

@coilsinamotor

I know that

[coilsinamotor]

@holycrapapie weird how does the chip know how much to amp it by?

[holycrapapie]

@coilsinamotor

I have no idea.

[coilsinamotor]

@holycrapapie ahahha all well it works anyway good job :D

[coolsciencetech]

@holycrapapie

it has a preset gain of 20 I believe

[holycrapapie]

@coolsciencetech

Yes, and with resistors and / or capacitors it is possible to boost this to 200.

But that will sound like shit

[santax123]

@coilsinamotor

There is an internal resistor on the gain pins in the chip that will set it to 20%. With an extra external resistor you can bring this up to 200% gain.

[coilsinamotor]

@santax123 oh ic thats very cool :)

[memodexter]

y si funcionara bien para unos audifonos de 32 ohms?

[holycrapapie]

@memodexter

No he probado

[nvillebaseball]

how would i hook a capacitor up to this

[holycrapapie]

@nvillebaseball

Well, why would you want a capacitor?

[nvillebaseball]

@holycrapapie

more power so i can hook up my phone to my computer subwoofer

[nvillebaseball]

@holycrapapie

More power so i can hook a mp3 player up to my computer subwoofer

[francisroan]

heywat is byepass used for??

[holycrapapie]

@francisroan

In this case, it's not.

also: "Hey", "what" and "bypass"

[juvatude42]

is there a way to put a volume controll on 1 of these

[holycrapapie]

@juvatude42

repeat after me:

Video description

Video description

Video description

[yowillyjj]

@juvatude42 

[Mr60ftlesbianoctopus]

Semi Nice- Infected Mushroom

Great choice of song!

[haberakajager]

10x i made mine while seeing the video! it worked nice job!

[holycrapapie]

@haberakajager

Glad you liked it :D

[addkid31]

There is this new break through in technology called bread boarding! you should look it up. :D

[holycrapapie]

@addkid31

I have, and i loved it!

But this was way before I knew about any local supplier.

[mercilessfreak]

can i make one of these without a 5volt regulator?

[holycrapapie]

@mercilessfreak

You people give me brain cancer.

Read the description.

Read the comments.

Then, and only then are you allowed to write a comment of your own.

[zer0dahero]

This is exactly what i was looking for. Ty for posting this very straight to the point vid. I'm heading to Radioshack right now.

[haberakajager]

can i make a 555 chip instead?

[holycrapapie]

@haberakajager

If you're really into IC manufacturing, I guess it's possible.

I don't know how to make IC's myself, please tell me how it works out for you :)

[RickM1953]

@haberakajager LMAO

[100roberthenry]

why have the regulator...the lm386 can be used up to 12volts?????

[holycrapapie]

@100roberthenry

it's optional, but prolongs battery life.

[100roberthenry]

@holycrapapie fair enough!.... :)

[Prabhu8885]

Where should i connet the regulator middle pin??

[holycrapapie]

@Prabhu8885

To ground.

[ILOVEFIATBRAVA]

can i make the same thing whith my amp circuit?i have a TDA 2822M? thanks

[holycrapapie]

@ILOVEFIATBRAVA

Well, that's a power amp.

But you can always try.

[rednecktalkshow]

man can you please tell me what 5v regulator you use because there is like 1,000's of them you sure it is a voltage regulator.what amp is it.

[holycrapapie]

@rednecktalkshow

the regulator is, as seen in the video, a 7805.

[5150DamianDonahue]

thx, ths hlps alot

[raz0racanine]

why the regulator gets hot???

[holycrapapie]

@raz0racanine

Check your wiring, and your grammar.

[raz0racanine]

ur good at soldering.. can u donate me one???

[holycrapapie]

@raz0racanine

Can I spend time, parts and shipping-money to supply someone i don't know with an amp?

Yes I can.

But will I? no.

[francisroan]

ok then well 1st question where did ya get this idea?

2nd .i made one on a breadboard and the volume is good but its not clear (the lyrics of the song .its not clear) we cannot hear the lyrics properly ......wat seems to be the problem??/??

3rd . u should make this with volume controls ........so we can control the volume......

thats it please reply

[holycrapapie]

@francisroan

Ok.

1. I'm a nerd, stuff like this is always in my head.

2. The sound on this thing just isn't clear. Remember, this uses just the bare minimal parts

3. Volume pot's can be added in series with the speaker (for direct volume control), or between pin 1 and 8 (for gain control)

[francisroan]

where did ya get this idea i made one and it is not clear we cannot understand anythin wats the problem and oh the speaker is a 25 ohm one ..................??????????

[holycrapapie]

@francisroan

I'm not clear?

Take what you just wrote, and say it out loud.

Now that's not clear

[francisroan]

ive made a video how to put all of these on a bread board please watch...........just type lm386 on a breadboard

[holycrapapie]

@francisroan

if you really want people to watch, post it as a response and don't be all like

"hey, look at meee!"

[francisroan]

i put all of these on a breadboard

[KurtCobinmyhero]

And also, I accidently bought a 4 Ohm speaker can I still use it?

[holycrapapie]

@KurtCobinmyhero

Yes you can, but the volume will be lower and the chip might heat up.

[KurtCobinmyhero]

And also can I put a LED light and a on/of switch?

[holycrapapie]

@KurtCobinmyhero

Add the switch in series with the 9V plug.

Add the LED in series with a few hundred ohm resistor (play around with the value) with one lead to the switch (chip side) and other lead to the switch-free 9V lead.

[KurtCobinmyhero]

For the headphone Jack can I I use a 1/4 inpit Jack for a guitar amp?

[3mustardMoNkEyS]

I can't tell but is the speaker's wattage & impedance: 16 ohms & 0.5W?

Because my NJM386 circuit isn't providing much power output, or it is and my 16 ohm, 0.25W speaker is clipping because of the high power out.

[holycrapapie]

@3mustardMoNkEyS

I can't remember the wattage, but it is 8 ohms.

(Dude, pay attention to the video!)

The crap-tastic sound is natural, I mean, there are no filters at all.

Also, use proper grammar.

[3mustardMoNkEyS]

@holycrapapie Alright, thanks, and my grammar was crappy since I was in a rush.

[octaviomtzr]

THE 5 VOLT REGULAYOR CAN BE AN LM317?

HELP ME PLEASE

[holycrapapie]

@octaviomtzr

It probably can, but you'll have to find out how yourself.

Also, CAPSLOCK!!!!

[13SEK17]

dude!! it able to put a adjustable volume?

can you sendg me the schematic of this amp at my e-mail? IOISEKIOI13@yahoo.com.,.

[Daco65]

@13SEK17 yes you can. if you add a pot(entiometer) between the audio jack & the LM386 or between the LM386 & the speaker you can adjust the volume with a knob :)

[jebach0omajke]

could u run two of these ics in series with 1 9 volt so u can make a stereo amp?



[madjubis]

can you send me the schematic of this amp?

[holycrapapie]

@madjubis

Sure thing, just shoot me a PM with your email address, and I'll draw something for you : )

[drobinray]

@holycrapapie please send me...drobinray@yahoo.cm

[mngstr187]

@holycrapapie

I need one too! Thanks!

[holycrapapie]

@mngstr187

I accidentally deleted your old message, please send me your email

[madjubis]

can you send me the schematic of this amp?

[TroyOi]

I want to set up a coffee shop with up to 6 speakers (3 sets of speaker pairs), all driven by an mp3 player. Can anyone suggest where to find a good circuit to amp up the signal and split it, with little or no distortion or noise? TIA.

[holycrapapie]

@TroyOi

Well, if you want something good but still DIY, check sites like jameco or sparkfun.

If you want something else, check with a local electronics store.

[R5H4D0W]

I'm not sure whether this method is possible....for one thing the LM7805 needs to have the ground corrected to act as an LDO, otherwise its nothing more than a resistor, for another there exists no capacitors of any kind in the circuit, the ripple and DC feed through must be terrible =/

[holycrapapie]

@R5H4D0W

You are completely right, but keep in mind that this is a "quick and dirty" way of doing it, and mostly to teach people about op-amps.

[longgrasswarrior]

what if you had a bigger speaker?

[holycrapapie]

@longgrasswarrior

Probably some more sound.

It depends on both input power and speaker impedance/resistance.

[longgrasswarrior]

nice...i started gettin into makin one just not good at solderin right now but yeah nice video

[013Crashman]

thnx! Yay 4 pie!

[metalliholic]

awesome vid and music lol

[bob505470]

that is the simplest chip amp i have ever see. i have never seen one without resistors or capacitors til now. good work, im guna try this. btw do you know how many watts this thing puts out?

[holycrapapie]

Thanks!

And no, I do not know the output wattage, since my multimeter is dead and buried (RIP)