2x6W 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

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

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