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Old 19th December 2012, 07:38 PM   #11
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Originally Posted by csom View Post
You are more than most welcome

Usually this type of amp kits uses a bass and treble control. So I presume these two transistors are used here as buffer amplifiers.
And regarding the number of passive components there might be bass and treble controls too. I will look more and post my observation
also, pardon me, but according to you, pin number 10-12 should give the output but both of them after being filtered are getting short to the rail in between the circuit connecting to diode d1-d2.. this is very confusing...
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Old 20th December 2012, 12:02 AM   #12
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Well, after a lot of hammering on the brain, this is my personal observation.
Use it at your own risk.

Two cents more:

1. Connect the wires, Speakers, Potentiometers, Heat Sinks etc.

2. Get a small 9v battery and a switch.

3. Power it up with the battery for some seconds only and touch both the input one by one very quickly.

4. If you get any low humming or buzzing noise from the speakers, that's a good sign and you may go ahead with AC power testing.
I always do my first power up adding a Lamp in series with the AC Mains Transformer.

5. Last but not the least, I am missing a good filter cap in the board from your photos. So I marked a Blue Circle with polarity. An Electrolytic cap with 2200 Ufd 25V (warning: with correct polarity) is a good value to start with for ripple filter, I guess.

If it works, kindly post your feedback.
Best of luck.
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File Type: jpg final reference of LA4440.jpg (511.1 KB, 30 views)
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Last edited by csom; 20th December 2012 at 12:07 AM.
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Old 20th December 2012, 12:25 AM   #13
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Originally Posted by godslayer View Post
also, pardon me, but according to you, pin number 10-12 should give the output but both of them after being filtered are getting short to the rail in between the circuit connecting to diode d1-d2.. this is very confusing...
Please double check.
Here is what I figured out.
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File Type: jpg la4440 INPUT OUTPUT PATH.jpg (375.1 KB, 26 views)
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Old 20th December 2012, 12:33 AM   #14
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Originally Posted by godslayer View Post
Hi friends,

i am using sanyo 4400 IC's kit. .........
Err..., is it by mistake that you wrote 4400? I guess it would be 4440 as it is printed on the board.
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Old 20th December 2012, 12:53 AM   #15
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Here is one more thing to reduce the confusion regarding power supply.
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File Type: jpg La4440 PCB Power and signal ground .jpg (530.7 KB, 23 views)
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Old 20th December 2012, 02:59 AM   #16
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A Block Diagram in case anyone needs it.
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File Type: jpg Block Diagram of the board.jpg (22.5 KB, 18 views)
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Old 20th December 2012, 08:19 AM   #17
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I forgot to mention an important connection point in the PCB related to the grounding.

Please be careful while working with this and wish you a grand success all the way
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File Type: jpg la4440 Ground reference.jpg (302.8 KB, 17 views)
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Old 20th December 2012, 08:25 AM   #18
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thank you mr csom! can you just answer my one last query? can the circuit work without connecting bass-treble pot controls?
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Old 20th December 2012, 08:57 AM   #19
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Originally Posted by godslayer View Post
thank you mr csom! can you just answer my one last query? can the circuit work without connecting bass-treble pot controls?
Sure the circuit can work without Bass and treble pot Control. But I would prefer small variable resistors in place of them to obtain proper gain.
Any way you can experiement later on.
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Last edited by csom; 20th December 2012 at 09:04 AM.
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Old 20th December 2012, 09:42 AM   #20
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i just want to use minimalistic components for the dry run.. thats why i am asking that... anyhow the parts have been assembled.. ill post the result of the run in few hours as i am not at home...
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