Author Options:

How to make amplifier using (2) LM4440 ic maybe bridge ! Answered

Hello , i have a circuit board, having all element,

I want to make a good amplifier using 2  lm4440  ic, as given in the images,

Please help me to find music input connection, speaker output and dc input,+ -

And also tell me is this best for high bass,

Please find all circuit diagram,



6 months ago

I cannot help people vvho are blind !

then go to H..

Wow.... Mannu the demon telling me where to go...

Did you ever click the picture and have a sighted person compare it to the original circuit ???

thx for respect, but i didnt found ic pin (leg) no.4 and 8 in ur image, as my ic have total 14 pins, and if u dont want ro help mine then simply say sorry, thx again for respect( i m demon )

When a pin on a 14 pin IC1 is not shown it is a you understood no_connection...

this is the thing u need to mention first, because i didnt know it first,

At last , can u tell me where is c1 in diagram to increase value,

And tell me voltage and uF of capacitor , that need to replace to increase bass. And sorry again i m demon fknn begineer, so, i'll take time to understand

If you lack or vital and bsic skills to build this circuit then it would be wise and logical to start with something smaller.
Get a ready to solder kit or something to work on breadboards and learn from there.

Sorry to say but what would be the point if we explain it all but you have no clue how to check your results or at least understand what the circuit is doing.
Get some ready to go amps and make musik with them and while listening to it do some easier stuff first ;)
Before we landed on the moon we learned how to fly ;)

i m not doing this for fkin learing.. I have this board and i only want to make amplifier, not fkn doing soldering, i better know, btw i m asking to iceng ,not to u, ok !!! Moon monn etc etx..

Watch your language dude, your attitude stinks to say it nice.
You want help but refuse good advise and give insults instead.
Go ahead and do your thing your way but don't expect anyone here to help you more than what we already did ;)

I thought u leave anger in the past year, but it seems, still little bit u have,

It is not anger ;)
Look at your replies and what was done by other people to help you going.
If you not with the right tools and have no clue about car engines: Would you replace worn piston rings yourself or would you drop the car into a shop to get it fixed?
I understand your need to build you amp from what you have but without any knowledge or the tools to do so I fail to see it working out.
And despite leaving "u" and "g" you expressed yourself quite clearly.
Asking for respect also means respecting others, which I did not see in your replies.
Being direct and honest might offend you but would prefer someone spoon feeds you through something that might take weeks to finnish and never work?


If OP does not solder then this is a fools errand because after cleaning that PCB there will be even more difficult desoldering and soldering without delaminating the conductor traces and you will see (the OP) get disappointed and agitated younger man who will plummet me all the way to the depth Hades ;-(


6 months ago

A single amplifier, increasing C1,C8,C9 by 20% will increase Bass response..


all done, but bass not good, and what u said abt c1,c8,c9, i didnt get anything abt this, i just wire input and output, help me to get bass boost

Click the pick to see all.

You do not have a published skill set (what you can do) ?

The increase of the selected capacitance by 20% means 0.1x0.20 => 0.02

The nearest value is .022uF example

LM4440 Bass.jpg

6 months ago

Regrettably I see no circuit !

This board has been Stepped On and submerged in DEEP DIRTY MUCK and even if I could make out 'READ the IC names' there is NO way to ID where copper traces run on the component side to answer your Question..

If you want to salvage and test the audio amp IC be my guest but I would not use the board.
No clue where you found it but it looks like it had a lot of abuse from the elements.
Even if you clean it there is no way of telling if that stuff will ever work again.

Well, no circuit but in any case the datasheet will answer your connectivity questions.
As for sound there is a reason why people use capacitors and inductivities to match the frequency range of their speakers.
If you are just after the big boom instead of natural sound you might want to consider using a seperate amp for a seperated bass speaker or subwoofer.