CDPro2 9V modification

Sunsun22 · 16th September 2009, 05:57 AM

I assembled a CDPro2 transport from hifidiy.net. It sounds great on the start but as a DIYer, you always look for modification. The power supply is using two stages LM317. One 5V for CDPro2 (digital circuit), One 5V for onboard digital circuit and one 9V for CDPro2.

I changed the 5V power supply for CDPro2 to DEXA. The background becomes more quiet. Now my question is - would there be great improvement by changing the 9V supply? Bearing in mind that this 9V is only for the drive motor.

Catbag

Sunsun22 · 20th September 2009, 07:58 AM

It seems no one has tried to modify the 9V for CDPro2 here, isn't it?

simon dart · 21st September 2009, 09:17 AM

My experience is that different 9V supplies can make a difference to the performance. I went from a plain vanilla LM317 reg to a full blown 1.2A shunt reg kindly designed by a friend of mine (I couldn't cope with doing that!). The improvement was fairly subtle but worth having. The bass was cleaner and felt a little more extended.

The 9V drives the motor and laser servos as far as I know so high current and good transient performance are what to look for.

Simon

16th September 2009, 05:57 AM	#1
Sunsun22 diyAudio Member Join Date: Jul 2004 Location: Hong Kong	CDPro2 9V modification I assembled a CDPro2 transport from hifidiy.net. It sounds great on the start but as a DIYer, you always look for modification. The power supply is using two stages LM317. One 5V for CDPro2 (digital circuit), One 5V for onboard digital circuit and one 9V for CDPro2. I changed the 5V power supply for CDPro2 to DEXA. The background becomes more quiet. Now my question is - would there be great improvement by changing the 9V supply? Bearing in mind that this 9V is only for the drive motor. Catbag

21st September 2009, 09:17 AM	#3
simon dart diyAudio Member Join Date: Mar 2004 Location: Herefordshire	My experience is that different 9V supplies can make a difference to the performance. I went from a plain vanilla LM317 reg to a full blown 1.2A shunt reg kindly designed by a friend of mine (I couldn't cope with doing that!). The improvement was fairly subtle but worth having. The bass was cleaner and felt a little more extended. The 9V drives the motor and laser servos as far as I know so high current and good transient performance are what to look for. Simon __________________ All generalizations are false, including this one.

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20th September 2009, 07:58 AM	#2
Sunsun22 diyAudio Member Join Date: Jul 2004 Location: Hong Kong	It seems no one has tried to modify the 9V for CDPro2 here, isn't it?