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Old 16th December 2012, 08:09 AM   #1
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Default help with this dual LA4440 IC amp

i want help with this...........

I want to know where its -ve and +ve wires where battary is attached...

And audio input and output wires......


This chip is in my old dvd player.......
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Old 16th December 2012, 08:49 AM   #2
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http://www.datasheetcatalog.org/data...nyo/LA4440.pdf
Page 2
Please check it if that serves your purpose.

1. Pin 11 is for VCC and Pin 8 and 14 for GND as per datasheet. ( Double check it please )

2. Audio input is at pin 2, may be there is a coupling cap.

3. Pin 10 and 12 are for speaker output via 1000mFd caps. ( in your case the yellow+ green and blue+white, i guess)

I guess the circuit has a conventional Bass Treble Volume control .
The lower part of the PCB in the first pic is usually the preamp/ active tone control as I guess. The Flat Ribbon cables are usually for dual Bass and dual Treble controls ( 3+3 and 3+3).

Please check it many times before connecting ( I destroyed some 4440s in my adolescence )

And welcome to the forum
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Last edited by csom; 16th December 2012 at 09:18 AM.
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Old 16th December 2012, 09:41 AM   #3
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As far as my memory scans the past, I guess once I had seen a solution like the following for reverse polarity protection.
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Old 16th December 2012, 10:49 AM   #4
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The 3 core Shielding wire is used for the signal input to connect your music source in this kit as it is seen in the second photo. Possibly they are connected to the place you need to mount the dual volume control potentiometer. As I can see the balance is unused.

Most likely a passive tone control section is used.

The Red and Yellow wire (near the middle-left side in the second photo) might be some kinda Voltage regulation to power up another section as I can see there is a transistor Q2. May be a +5v output for USB mp3 kit?

All I posted here is a mere guess work from your posted photos and might not be accurate. It is the best to follow a literature if any that ususally comes with the kit.

All the best.
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Last edited by csom; 16th December 2012 at 11:13 AM.
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Old 16th December 2012, 02:55 PM   #5
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ok thankxx.......it works.........

But when i connet 220v to 12v dc converter with this circuit......it woks perfect.....

And when i use two 9v battries with it.....it do not work well..........
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Old 16th December 2012, 03:09 PM   #6
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May be two 9v batteries are not sufficent to power them up? Did you try with a 12 Volt car battery?
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Old 16th December 2012, 03:14 PM   #7
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As per datasheet the max recommended operating voltage is 13.2 so please be careful else you might be the sad owner of two fried chips .
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Old 18th December 2012, 12:30 PM   #8
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Quote:
Originally Posted by csom View Post
As far as my memory scans the past, I guess once I had seen a solution like the following for reverse polarity protection.
If you can live with 1,4 V voltage drop.
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Old 18th December 2012, 03:43 PM   #9
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Very true
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Old 31st December 2012, 01:47 AM   #10
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and one other question.......i use 220v to 12v @ 1A............is any higher current transformer is used to gain best output??
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