Any advice on this opamp?

andyoooooobun · 19th February 2011, 05:41 PM

this is the circult of korg mr-1
the opamp RC4580 is really bad
n I found that the lineout and phone out seems have to pass through this opamp
however there is limited choice for opamp..as mr1 just provide 5v power supply and no space

can any one suggest any method to improve the sq?
i don mind if i have to change the opamp or bypass
i just need the line out and recording function

andyoooooobun · 19th February 2011, 06:03 PM

the opamp is on the top left corner of the left picture..right above the phone out

AndrewT · 19th February 2011, 06:16 PM

go and read the threads on experiences with SMD assembly and SMD component swapping.

If after that you are confident you have the tools and skills to carry out the modifications come back and ask again.

Mooly · 19th February 2011, 06:20 PM

How to work on SMD,
Working with SMD. How to do it without specialised tools.

LAJ · 19th February 2011, 06:47 PM

Also check to see if any of the resistors around it are fried. If they are, the value may be unreadable. Then you need a schematic.

andyoooooobun · 20th February 2011, 01:48 AM

yeah i don believe in my skill as well...so i just ask my fd to do it
this player is really strange...i can adjust the line out volume

19th February 2011, 05:41 PM	#1
andyoooooobun diyAudio Member Join Date: Jan 2011	Any advice on this opamp? this is the circult of korg mr-1 the opamp RC4580 is really bad n I found that the lineout and phone out seems have to pass through this opamp however there is limited choice for opamp..as mr1 just provide 5v power supply and no space can any one suggest any method to improve the sq? i don mind if i have to change the opamp or bypass i just need the line out and recording function

19th February 2011, 06:16 PM	#3
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	go and read the threads on experiences with SMD assembly and SMD component swapping. If after that you are confident you have the tools and skills to carry out the modifications come back and ask again. __________________ regards Andrew T.

19th February 2011, 06:20 PM	#4
Mooly diyAudio Member Join Date: Sep 2007	How to work on SMD, Working with SMD. How to do it without specialised tools. __________________ ------------------------------------------------------- *A simulation free zone.* *Design it, build it, test it.*

19th February 2011, 06:47 PM	#5
LAJ diyAudio Member Join Date: Mar 2008 Location: Atlanta Ga. USA	Don't bypass it. Also check to see if any of the resistors around it are fried. If they are, the value may be unreadable. Then you need a schematic.

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19th February 2011, 06:03 PM	#2
andyoooooobun diyAudio Member Join Date: Jan 2011	the opamp is on the top left corner of the left picture..right above the phone out

20th February 2011, 01:48 AM	#6
andyoooooobun diyAudio Member Join Date: Jan 2011	yeah i don believe in my skill as well...so i just ask my fd to do it this player is really strange...i can adjust the line out volume

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