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Old 20th December 2012, 09:54 AM   #21
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Yay! Eagerly waiting for the result and crossing my fingers

And trying to find a place to hide incase I made a mess by giving you wrong info
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Old 20th December 2012, 04:46 PM   #22
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Csom sir!

i am pleased to inform you that project was a success! the volume controls are precisely where they should be.. and there is no heating/sparking or anything.. but there is a small problem... the sound is very less.. i mean my earphones sound higher! i guess this is because i didnt connect the bass-treble controls... i guess i should do that before coming to any conclusion as you yourself said it will not get proper gain without those pots.. anyhow thanks a ton for the help
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Old 20th December 2012, 04:55 PM   #23
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Originally Posted by godslayer View Post
Csom sir!

i am pleased to inform you that project was a success! the volume controls are precisely where they should be.. and there is no heating/sparking or anything.. but there is a small problem... the sound is very less.. i mean my earphones sound higher! i guess this is because i didnt connect the bass-treble controls... i guess i should do that before coming to any conclusion as you yourself said it will not get proper gain without those pots.. anyhow thanks a ton for the help
Csom, great piece of reverse engineering! Nice work.
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Old 20th December 2012, 04:57 PM   #24
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Csom sir!

i am pleased to inform you that project was a success! .......
Hugs!

Only "Som" is more than adequate

Thank you for your kind feedback

I am so happy for you!

Congratulations!!

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Old 20th December 2012, 05:01 PM   #25
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Csom, great piece of reverse engineering! Nice work.
Thank you so much quadtech!

It really hurts that some manufacturers really don't care about the customer/hobbyists and their hard earned money. It's hard to believe that an audio kit comes with absolute no reference

So sad.
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Old 20th December 2012, 05:07 PM   #26
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Csom, great piece of reverse engineering! Nice work.
indeed..! great reverse engineering..delivered very detailed and kindly(answering my noob questions.)

as for the sir part! i am half of your age. i guess i should call you that...
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Old 20th December 2012, 05:48 PM   #27
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Originally Posted by godslayer View Post
indeed..! great reverse engineering..delivered very detailed and kindly(answering my noob questions.)

as for the sir part! i am half of your age. i guess i should call you that...
Bro, I came here to learn about audio ,just like you, from other great masters of audio in the fora

So we are co-learners.

Hugs
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Old 20th December 2012, 05:51 PM   #28
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Bro, I came here to learn about audio ,just like you, from other great masters of audio in the fora

So we are co-learners.

Hugs
dear Som sir,

I noticed two things, the potentiometers given as BASS AND TREBLE have NO EFFECT ON THE OUTPUT WHATSOEVER also, connecting the bass and treble control has no effect on the output.. the output is still barely hearable...
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Old 20th December 2012, 07:16 PM   #29
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Okay bro,

Checklist here:

First please check if every solder joint is okay or not.

then....
1. Check if the supply voltage is as per recommended value using a multimeter. And test the voltage at the collector of the transistors too (in the active tone control section).

2. Touch a screw driver at the pin 1 and 2 of the 5 pin connector ( that goes to the input pin 2 of the ICs. If everything is okay you should hear a louder hum if your system is powered with AC 12 Volts using a step down transformer.

3. Make sure everything is wired as per the connection. Touch at each input of the Bass and Treble you will notice some noise/hum.

4. If that fails, the problem might be in the active tone control section.
In that case, please study the following tone control circuits using Transistor so that you can understand how it works.

http://www.electronicecircuits.com/e...ontrol-circuit

Bass Treble Controller Circuit Diagram For Amplifier | Electronics Circuits For Students


5. The potentiometers should ideally be 100K . But 47K works too with a compromise in some cases.

Hope you have not missed the Filter Cap, c19 I guess. ( please check previous posts)

Please make sure the LA4440 Ics are running properly. The rest can be solved easily.
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Last edited by csom; 20th December 2012 at 07:18 PM.
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Old 21st December 2012, 01:06 PM   #30
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Now you will enjoy the true DIY spirit.

Don't be frustrated. This trouble shooting is the fun part in a DIY situation.
It is a very very simple circuit. Study the datasheet over and over again.

Keep your cool. Don't make haste. It happens in the life of every hobbyist.

Please wear a protective eye glass and always be careful with the polarity of the evil electrolytic capacitors while fault finding your amp.

You yourself will figure the problem out in no time, I am confident.
All the very best.
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