Introduction: LM4440/LA4440 20W AUDIO AMPLIFIER WITH 12V

About: m mad about electronics, technology........who m i ??? son just don ask that .......

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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78 Discussions

how to rectify this problem i also using by capacitor and resistors

I am using LA4440 with fm radio and its giving noisy output how to check

I don't want any volume knobs or bass, treble ones what should I do?

Please told me bro!!!
What is voltage rating of all capcitor

Bro plzzzzz tell me how i connect potentiometer to the circuit board

1 reply

All pins are shown in the diagram/pic so plz follow it carefully

check the GND connection .........most of the time its the main fact.

LA4440 using as amplifier but not output how to check


1 year ago

this PCB pattern is bottom view or front view?

its all written already bro. read it. FOR VOLUME = 100K

want is the capacity of variable resistor to increase the volume can you plz give me value

Hello Mr. Victordas

1- how can I use Mic as input in this circuit ?

2- What is the specifications of Mic and speaker that I can use in this circuit.

1 reply

will be needing little changes. specifications depends on circuit and what changes done on it. can't say it now have to change it first.

How much is the cost in making speaker also?