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la4440 audio amplifier schematic

LA4440 Audio Amplifier

Application:

Make your own computer speaker system. This simple and inexpensive project will let you set up a small audio amplifier and let more sound out your computer.

Description:

A simple audio amplifier based on the LA4440 IC. This will take your computer’s headphone level output and amplify it to drive a pair of external speakers. If you are listening to music or movies on laptops and computers, this is a useful little project for you. Laptop speakers are never loud enough to give satisfying listening. They give users the ability to hear something, but for anything like music or movie soundtracks they are very poor performers. The output from a laptops built in speakers is just too low, and this circuit addresses that low power with some additional amplification.

This circuit uses an LA4440 and some supporting components to give you much more power, while retaining a small package that you can use. The IC is a dual channel audio power amplifier, with low distortion, and a good frequency range.

Using 2 channels, the LA4440 will output 6 watts per channel, that can drive much larger speakers than a laptop can hold. When you set up a small enclosure(s), a 12V power supply, and an audio jack connection to the laptop you’ll have a nice enhancement to your laptop audio enjoyment.

Schematic of the audio amplifier

la4440 audio amplifier schematic

[learn_more caption=”Click here for Parts List”]
RefDes Name Value Part Number Digi-Key Part Number Description
U1 AMP   LA4440 N/A 2-Ch Audio Amp
C3 POLARIZED 47uf EEE-1EA470WP PCE3908CT-ND CAP ALUM 47UF 25V 20% SMD
C2 POLARIZED 100uF EEE-1EA101XP PCE3898CT-ND CAP ALUM 100UF 25V 20% SMD
C4 POLARIZED 47uF EEE-1EA470WP PCE3908CT-ND CAP ALUM 47UF 25V 20% SMD
C5 POLARIZED 100uF EEE-1EA101XP PCE3898CT-ND CAP ALUM 100UF 25V 20% SMD
C6 NON POLARIZED 0.1uF C3225JB2E104K200AA 445-11876-1-ND CAP CER 0.1UF 250V 10% JB 1210
C7 POLARIZED 330uF EEE-1EA331UP PCE3906CT-ND CAP ALUM 330UF 25V 20% SMD
R1 RESISTOR 330 CRCW2010330RJNEF 541-330WCT-ND RES 330 OHM 3/4W 5% 2010 SMD
SPK1 SPEAKER       YOUR CHOICE 2-8 OHMS
SPK2 SPEAKER       YOUR CHOICE 2-8 OHMS
C8 POLARIZED 330uF EEE-1EA331UP PCE3906CT-ND CAP ALUM 330UF 25V 20% SMD
C9 NON POLARIZED 0.1uF C3225JB2E104K200AA 445-11876-1-ND CAP CER 0.1UF 250V 10% JB 1210
R2 RESISTOR 330 CRCW2010330RJNEF 541-330WCT-ND RES 330 OHM 3/4W 5% 2010 SMD
C10 NON POLARIZED 330uF EEE-1EA331UP PCE3906CT-ND CAP ALUM 330UF 25V 20% SMD
C1 POLARIZED 2200uF EEV-FK1E222M PCE3463CT-ND CAP ALUM 2200UF 25V 20% SMD
[/learn_more]

12 Comments

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  • ARIVAZHAGAN S.P

    Sir..how to connect the volume controls and triple base controls for la4440 stereo ic board .Pl send to me la4440 ic board’s wiring connections and more pcb images for la4440 ic board’s.

  • Sadanand Manjhi

    The article is simple and nice. Can the IC drives 40 watts speaker loads?

  • raka

    Sir, I want to make my an amplifier, but i don’t have a PCB Layout, I am pursuing computer engineering and just curious to make one. Can you PLEASE provide a PCB Layout with part list and name. and where to place which part on the board. It’s my first time to make a PCB, i just know how to repair a circuit board.
    Thanks

  • Ajimon

    Why a mic connected in a la 4440 stereo audio board

  • Manobal

    Dear Sir,
    Can I use two 19w mid speaker to a stereo type la4440 amp?
    Right now I’m using two 5w Speakers, but they vibrate too much when my latop volume is increased. Please help with the issue. Thanks in advance.

    • C.Mitra

      Dear Manobal
      As far as I can remember the spec sheets, the LA4440 can provide about 5.8 Watts of power per channel in stereo mode. Your speakers should be rated at least 6W each, but if you really wnat to get the maximum output from this amp. get 10W speakers, preferably 5″ dual cone types.
      One more thing, the exessive vibrations may be due to 50Hz hum leakage through the input cables. Use good quality shielded cables for signal input connection.

  • ayush pandey

    where exactly should i put the coupling capacitors?
    and how can i implement volume, bass nad treble control in this circuit using var. resistors

    • shrawan

      In this schematic I see only + pointin batteryi have negative pole of this schematic…help me and send my email id.

  • C.Mitra

    Dear Mr Marian, sorry to comment on this circuit so late. I saw this update today. It is a very standard circuit, can be easily made by hobbyists, but I think there is one serious issue. It is a healthy practice to always include an input coupling capacitor which will block any DC voltage from the signal source. This is especially important in the case of this circuit, since it is meant for using with a laptop. This is just for precaution, and a couple of 2.2uF capacitors will not cost much! I have made hundreds of these amplifiers (using LA4440 with LA3161 as preamplifier), the IC is very stable and easy to use. I have designed audio cassette decks and computer amplifiers using this IC which are produced commercially, so if any help is required in designing any circuit with this IC, I shall be glad to help.

    • LOKESH

      Dear Mr.Mithra

      i want to design the more than 10 watts audio amplifier in which circuit is good to design can u pls give an idea .pls mail to my email id (lokeshvecw@gmail.com)

    • Shiva

      hey hi iam trying to build one amplifier, i want to know the above circuit will give stable result, and i i want to know the speaker’s configuration which this circuit can drive, and also i have one doubt, can i use 8ohm 6 watt speaker instead of 4ohm 6 watt speaker? Please help

    • Pankaj

      Sir, I want to make my an amplifier, but i don’t have a PCB Layout, I am pursuing computer engineering and just curious to make one. Can you PLEASE provide a PCB Layout with part list and name. and where to place which part on the board. It’s my first time to make a PCB, i just know how to repair a circuit board.

      Thanks 🙂

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