B&O Beocenter 2300 modifications

swingarm · 21st February 2010, 07:03 AM

I am working to improve this player, it has has the CDM4/19 laser and TDA1541A DAC.

I have already bypassed several electrolytic caps in the signal path and OP amps has been changed from 4558 and LF353 to OPA 2134, this clearly improved the sound.

I have a couple of questions regarding further upgrades

I can see that removal of muting transistors and replacing the decoupling caps around the TDA 1541 are suggested in some treads.

Will the NPN muting transistors effect the sound in the case where the base resistors goes negative -15V when playing ?

The 14 decouplings caps on the TDA 1541 are 100nF SMD ceramic types, I have seen people replaceing with MKP and other types, and thereby add a lot of inductance. Can the 100nF stay or is there better alternatives?

Other suggestions are welcome

jegb · 18th March 2012, 05:28 PM

do you have schematic?

I am planning to add an arduino and music shield to be able to play music from sd card or external usb, any help with schematic could accelerate reverse engineer the connection points.

Thanks,
Jegb

21st February 2010, 07:03 AM	#1
swingarm diyAudio Member Join Date: Feb 2010	B&O Beocenter 2300 modifications I am working to improve this player, it has has the CDM4/19 laser and TDA1541A DAC. I have already bypassed several electrolytic caps in the signal path and OP amps has been changed from 4558 and LF353 to OPA 2134, this clearly improved the sound. I have a couple of questions regarding further upgrades I can see that removal of muting transistors and replacing the decoupling caps around the TDA 1541 are suggested in some treads. Will the NPN muting transistors effect the sound in the case where the base resistors goes negative -15V when playing ? The 14 decouplings caps on the TDA 1541 are 100nF SMD ceramic types, I have seen people replaceing with MKP and other types, and thereby add a lot of inductance. Can the 100nF stay or is there better alternatives? Other suggestions are welcome

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18th March 2012, 05:28 PM	#2
jegb diyAudio Member Join Date: Mar 2012	do you have schematic? I am planning to add an arduino and music shield to be able to play music from sd card or external usb, any help with schematic could accelerate reverse engineer the connection points. Thanks, Jegb

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