Picture of LM4440/LA4440 20W AUDIO AMPLIFIER WITH 12V
This is a simple audio amplifier circuit but pretty good output. it runs only with 12v power supply. it can also be used as car audio player only thing is need is vire mp3 player and for that i have included 5v power supply with LM7805 . i have designed this amplifier only for my few friends request as they need a small single speaker amplifier for their car which should be run from 12v supply and most importantly it should be cheap i mean very very cheap. This circuit is designed for only 1 speaker but with same two circuits near each other any one can built a full size car amplifier. All components are commonly available parts. The IC which i used is LA or LM 4440 its very cheap and commonly available and all Variable pots are 47k only  the Volume pot its 100k actually its better to use a 100k pot rather than 47k as volume. So built this circuit in a good quality  PCB and if you have any problem with this circuit than please communicate with me in---bishwa.baran.das@gmail.com.
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njb201 month ago
hey bro... what's the size of ur PCB?
victordas (author)  njb2025 days ago

4x3 (in)

AlbertK21 month ago
1001abhar made it!2 months ago

hello victordas sir, can you tell me what is max power of la4440 in bridge mode ? can i run 2x8'' speaker at same time.? thanks for reading sir.

victordas (author)  1001abhar2 months ago

In Bridge Mode it can be 19w. yes you can run 2 speaker same time but you will be needing 2 same circuits side by side

thank you for answering to me.sir,....but..i want to run 2 speaker only one single chip(bridge mode) at same time.....can i run 2 speaker each 15watt rms mean 2 speaker total with 30 watt rms only with 19watt power amplifier. does it make any problem or harm to la4440 ic.?what will be the negative effect?.........thanks for reading.
victordas (author)  1001abhar2 months ago

It will be better if u Use 2 Chips to run 2 spkrs. LM4440 is Not that hard chip. By connecting 1 spkr it gets very Hot. So it will be better if you use 2 chips. in that way you will be getting a very dependable circuit

ok .i got it, thanks for answering to me sir..........

jecko1 made it!6 months ago

hi!! victordas can i have a request can you give me your pcb layout of tda 7377 and tlo47 with parts i want to improve my audio amp in my house......thnk you vry much...

victordas (author)  jecko14 months ago

ok will try

masaroda7 months ago

Hello, Please guide me regarding connecting a volume dual gang potentiometer ..

hsharma167 months ago
I have a bridge setup of same ic which I removed from a old dvd player.
I accidentally broken down the transformer's one wire from winding now I am using a 12v 1amp charger to make it work but am getting a back voltage from the aux pins which is interfering with my phone's system am getting ghost touch when connected to it and I also got a broken 35v 4700uf capacitor in the circuit, it's in the place of your 25v 2200uf capacitor please let me solve this problem of ghost touch in my phone... Earlier when it was connected to the transformer there's no such problem and the capacitor is also good
victordas (author)  hsharma167 months ago

1st of all as you said u r using a "12v 1amp charger" to run it. A battery charger is lot more different frm a amplifier power supply. small things make big difference mind that. 2ndly change the damaged " 35v 4700uf capacitor" if it says "35v 4700uf than replace it wid same value. and mainly the ghost touch its happening for bad GND connection . Check it out carefully. hope this solves ur problem...if NOT than plz share ur problems again m here always to help 10q verymuch

victordas (author) 8 months ago

"S" means Loud "speaker"....2 connections so 2 pins marked as "S"

ajoy.dsilva8 months ago

mr.victordas, i have made this, but can u plz tell me what is the "S" in the green box?

zeeshansha1 year ago

hello victor bhai

can you please sent me the circuit diagram for this. I am getting hissing sound of the engine in the speakers.

victordas (author)  zeeshansha1 year ago

Sorry boss i don have the Diagram anymore. Check your GND connection carefully, hope this helps you

any one have 2n 3055 audio circuits for car or any tda stk audio circuits for car plz plz help me

manobalan1 year ago

Can I connect two 19w 4 0hm speakers to a la4440 stereo amp.

victordas (author)  manobalan1 year ago

yes u can...bt 4 that u need 2 build 2 same circuits side-by-side.

rludovice1 year ago
goog circuit there sir victordas but can u provide me the detailed parts list of the circuit where it can be to write down on my notes.the capacitor u use are all ceramic ryt?tnx very well done im planning to build one for my motorcycle.
victordas (author)  rludovice1 year ago

LM 4440 x 1
LM7805 x 1
100uf/16v x 6
4.7uf/16v x 5
1000uf/16v x 1
2200uf /25v x 1
470uf/16v x 2
104 x 2
203 x 1
403 x 2
222 x 1
.005 x 1
470r x 1
2.2r x 2
2.2r/1w x 1
100r x 2
10k x 5
33k x 1
4.7k x 1
150k x 2
1k x 3
47k x 1
BC548 x 1
IN5402 x 1
IN4007 x 1

If you need only the amplifier circuit than please skip the following--470uf,LM7805,2.2r/1w,IN4007,470r. This circuit was originally designed to work with "vire Mp3 card" for that we need 5v power supply but if you are planing to use only the amplifier than these parts are not necessary.

victordas (author) 1 year ago

2amp minimum

ANEEK1231 year ago
what is the ampaire rating of the amplifier
kamus11022 years ago
hola a todos saludos desde colombia espero que funcione con el voltaje de mi pais 120 V
victordas (author)  kamus11022 years ago
English plz.....i can't understand ur language
hi all greetings from Colombia hope it works with my country voltage 120 V = using google translate
victordas (author)  manishrkp1 year ago
10q very much my friend but it only works with 12v......max voltage 16v......you need to reduce the voltage from 120v to 12v with a transformer (safe way)
handry1 year ago
than you very much victordas???
handry1 year ago
plz victordas what is use 222,403,203 in amplifier plz tell me plz?????
victordas (author)  handry1 year ago
222,403,203 these all are ceramic capacitor for smoothing the wave.......but you can use almost any near value
I made this Circuit , but the Distortion is High !!!
victordas (author)  Visakh Parayil2 years ago
chk ur connection's.......n mainly GND connection....
aaaooo602 years ago
thanks bro
victordas (author)  aaaooo602 years ago
you are most welcome "aaaooo60"
Great work dude!!!will definitely make it...
victordas (author)  Adarsh_tronix2 years ago
10q very much "Adarsh_tronix" ............make it n enjoy ....
victordas (author) 2 years ago
yes my friend yes
aaaooo602 years ago
ha, 100r resistance mince 100 ohms
victordas (author) 2 years ago
Yes i have uploaded the new picture where all pins are marked. All the pin's are there but unfortunately i missed them. sorry friend
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