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Old 26th December 2012, 10:17 AM   #61
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Quote:
Originally Posted by sudhir kumar View Post
That is waste of money dear...better if you had tried first the diy lasetoner transfer method..by the way..the pcb maker charged you very rational price..................................
Yes, you are right Sudhir. I mainly asked the help form the man so that I can obtain the top layer for component placement. But as you can see, the top layer is all blurry and illegible. As a result of this I had to follow the top layer picture as provided by the original author in the download section of that site, just like you did in your project. So, yes, a clear waste of money But that was a lesson.

I guess he used some wasted small copperboard so he charged a little less, seeing it a personal hobby project. But the pcb quality was very good, I mean better than that I use with the normal toner trasnfer method. That's the consolation.

Quote:
Originally Posted by sudhir kumar View Post
For RCA you can search MX Connectors dealers/website. for 20k resister use 2 10k in series.
............
1. I did a modding of the PCB to use the 6 set RCA connector.

2. True. But luckily I found 20K ones. That saved me from additional solder joints
.
Quote:
Originally Posted by sudhir kumar View Post
What is the cost of lm3886 and on which place ?
The vendor charged me a lot ( blame it on my drooling and laziness by not checking out the price in other shops)
I got all plastic TF versions for INR 425 per piece at chandni chawk.

Thank you Sudhir for your response.

Here is another question :

Can I replace those 6 variable resistors with Dual potentiometers and discard additional volume controls for the Amps?
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Last edited by csom; 26th December 2012 at 10:26 AM.
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Old 26th December 2012, 10:24 AM   #62
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And how did you adjust the level using audio oscillator and multimeter as suggested in that site?

Thank you.
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Old 26th December 2012, 11:03 AM   #63
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I want to build the power supply like this attached picture.

Could you please tell me if this is possible or not?
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File Type: jpg POWER SUPPLY PLAN IF THIS IS POSSIBLE.jpg (31.7 KB, 202 views)
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Old 26th December 2012, 12:16 PM   #64
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INR 425 for 1 lm3886...perhaps too costly..I expect something near 250-300.
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Old 26th December 2012, 12:19 PM   #65
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Originally Posted by csom View Post
I want to build the power supply like this attached picture.

Could you please tell me if this is possible or not?
Better to use different one trafo for preamp and xover and another for power amp. Your suggested Idea will also work but connect the wires directly to trafo, means all wires from pcb directly connected to trafo instead of one pcb to another.
thanks.
sudhir.
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Old 26th December 2012, 01:05 PM   #66
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[QUOTE=sudhir kumar;3299428]Better to use different one trafo for preamp and xover and another for power amp. Your suggested Idea will also work but connect the wires directly to trafo, means all wires from pcb directly connected to trafo instead of one pcb to another.
................./QUOTE]

Okay Sudhir,

I tried powering them all with a single Transformer but a Hum appeared in the sound.
So I changed everything and removed the power supply of the Original design of the X-over and getting Power from the Preamp power Supply. Things are working normally now for last 15 minutes or so and Hum is gone now.

Perhaps you have missed my earlier question.
Can I use Dual Potentiometers in lieu of those Variable Resistors and discard the volume control of the Power Amps since I already have a Volume control in the Preamp ?
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Last edited by csom; 26th December 2012 at 01:14 PM.
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Old 26th December 2012, 01:16 PM   #67
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Oops, I forgot to attach the pic

Here is the common Power supply section of the EQ, PRE-Amp and X-Over thats is being used now.
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File Type: jpg Revised Power Supply for the PREAMP AND XOVER.jpg (26.9 KB, 194 views)
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Old 26th December 2012, 06:57 PM   #68
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Dear friends,

I am am very happy to inform all of you that the project has been successfully executed with all your always extending kind helping hands.
A big thank you to all of you. ( including dear Santa )

Also my heartfelt thanks to Mr. Mick Gergos who painstakingly designed the corss-over and thoughtfully documented everything and kindly provided the much needed download files here Silicon Chip Online - Active 3-Way Crossover for Loud Speaker Systems .

Thank you really so much www.siliconchip.com.au for the support that you constantly provide to the hobbyists "to build for their own use".

Wish you all a very happy and prosperous New Year from the core of my heart !

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Old 26th December 2012, 07:28 PM   #69
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Here is a photo of the x-over, yet to find a house for it
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File Type: jpg x over completed protype.jpg (641.6 KB, 777 views)
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Old 27th December 2012, 11:02 AM   #70
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by csom View Post
I want to build the power supply like this attached picture.

Could you please tell me if this is possible or not?
no.

You have connected the centre tap to all three PSUs.
This means you cannot later connect the audio grounds together without creating a ground loop.

BUT your linked PSU centre tap carries charging pulses. This is a contaminated ground.

Do not do it your way.
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