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Old 3rd March 2008, 10:43 AM   #1
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Unhappy Burson Dual opamp HELP

I just got a pair of Burson Dual discrete opamp and installed it on my Philips cd620.
But I do not know how to ground the op amp.
It is suggested that I can ground it to a RCA connector, but there is obvious noise with I ground it to the RCA(-ve side).
Please give me some help.
Thank you.
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Old 7th March 2008, 01:53 AM   #2
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push
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Old 7th March 2008, 07:01 AM   #3
Mooly is offline Mooly  United Kingdom
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Why do they need a separate ground. They can't be a "direct replacement" if extra connections required. I would suggest you earth it to a signal ground close to the op-amp. See if pins 2 or 3 connect either directly to ground or if they connect via a single resistor to ground. If you are not sure you need a meter to measue ohms to locate. Was there no documentation supplied ?
Regards Karl
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Old 7th March 2008, 03:31 PM   #4
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Default Should be no noise!

They can surely be a direct replacement. However Burson recommend to ground them, for better performance. I have done this, and there are no any problems with the grounding. Just locate a signal ground near the OpAmps. Use a meter if needed (as advised above). Should be no noise!.
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Old 8th March 2008, 03:20 AM   #5
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Thx so much.
YES, There is no document supplied.

I will try to use a meter to find a ground but how to use ohm to locate a ground?
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Old 8th March 2008, 07:00 AM   #6
Mooly is offline Mooly  United Kingdom
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O.K. First you need to be happy using a meter on LOW ohms range i.e. can you reliably measure down to 1 ohm. Make sure the power to player is off. The outer part of the phono sockets on rear panel is a signal ground (there may be others). You say you connected to this point and the result was poor. Double check this again, and make sure connection is to this "outer" part of socket. Solder the wire to this ground on the P.C.B. at the socket and use meter to check that this point is ZERO ohms as measured from the outer part of socket to the wire. I still find it unbelievable that precise fitting instructions are not provided. If you are sure this is no good and you have noise then I wonder if the "ground wire" should even be connected to a signal ground at all. Without having one of these modules to examine it's impossible to say. It may be that this is a P.S.U. ground. Philips players often have many separate grounds to isolate various parts of the circuit and it is important to use the correct one. I would suggest you contact Burson and ask if this is a signal or P.S.U. ground wire.
Regards Karl
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Old 8th March 2008, 07:20 AM   #7
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Default Burson Basic Installation

Also look here :

http://www.bursonaudio.com/Burson_Di..._Opamp_101.htm
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Old 8th March 2008, 07:44 AM   #8
Mooly is offline Mooly  United Kingdom
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Nice link, I hope it helps our friend out. Seems like it is a signal ground.
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Old 8th March 2008, 08:19 AM   #9
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Default Grounding the Bursons OpAmps

indeed not a great picture but should give an idea..
Attached Images
File Type: jpg grounding the burson.jpg (50.5 KB, 476 views)
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Old 9th March 2008, 03:35 PM   #10
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Thx everyone for great great help.
I will try all the solutions mentioned by you gentlemen.
I feel so excited to have so much support from all of you.
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