Burson Dual opamp HELP

chofaichan · 3rd March 2008, 10:43 AM

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.

chofaichan · 7th March 2008, 01:53 AM

push

Mooly · 7th March 2008, 07:01 AM

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

irgendjemand · 7th March 2008, 03:31 PM

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!.

chofaichan · 8th March 2008, 03:20 AM

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?

Mooly · 8th March 2008, 07:00 AM

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

irgendjemand · 8th March 2008, 07:20 AM

Also look here :

http://www.bursonaudio.com/Burson_Di..._Opamp_101.htm

Mooly · 8th March 2008, 07:44 AM

Nice link, I hope it helps our friend out. Seems like it is a signal ground.

irgendjemand · 8th March 2008, 08:19 AM

indeed not a great picture

but should give an idea..

chofaichan · 9th March 2008, 03:35 PM

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.

3rd March 2008, 10:43 AM	#1
chofaichan diyAudio Member Join Date: Oct 2007	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.

7th March 2008, 03:31 PM	#4
irgendjemand diyAudio Member Join Date: Dec 2007	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!.

8th March 2008, 07:20 AM	#7
irgendjemand diyAudio Member Join Date: Dec 2007	Burson Basic Installation Also look here : http://www.bursonaudio.com/Burson_Di..._Opamp_101.htm

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7th March 2008, 01:53 AM	#2
chofaichan diyAudio Member Join Date: Oct 2007	push

7th March 2008, 07:01 AM	#3
Mooly diyAudio Member Join Date: Sep 2007	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

8th March 2008, 03:20 AM	#5
chofaichan diyAudio Member Join Date: Oct 2007	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?

8th March 2008, 07:00 AM	#6
Mooly diyAudio Member Join Date: Sep 2007	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

8th March 2008, 07:44 AM	#8
Mooly diyAudio Member Join Date: Sep 2007	Nice link, I hope it helps our friend out. Seems like it is a signal ground.

9th March 2008, 03:35 PM	#10
chofaichan diyAudio Member Join Date: Oct 2007	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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