Philips CD650 mods

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#803
The 53/63/67 type players do present the details in quite an upfront manner so you need to be careful when assessing how detailed each player really is. You don't want to confuse the dark, laid-back character of the TDA1541-equipped players for a lack of information.

Your 5V separation will do wonders in the CD40 as in the CD53/63 etc. Clocking is just as important as it is with the CD53 - it's just a different chipset and different frequencies!

Simon
 
#804
Guys, I've done some more power supply work!

I had a strange problem with the additional transformer I was using for a couple of 5v supplies (DEM Clock/ Filter etc). With the transformer plugged in (cd player switched off) the was a high freq noise on the mains audiable through the amp! If I switched the palyer on, it was quiter but not completely gone. I spent some considerable time using a process of elimitation and norrowed the ploblem to the CDP. All interconnects were removed from the amp and devices plugged in and out of the mains until I narrowed the problem to the CDP! I removed the additional TX, plugged the CDP back in and the problem was solved!

So, now i'm a TX down! I used a couple of small 7VA's to get me out of trouble (def not man enough tho'). I decided I should start to add additional TX's. This was always the plan but I never got round to it!

I've now added a 2x9v 15va. This provides the power for the filter board via Hexfred, mundorf 15,000uF and 2 SPowers on 1 winding and via hexfred, mundorf 15,000uF, the +5v DAC via SPower and +5v DEM via SReg. This TX directly replaces the faulty one.

In addition, I also got a 2x15v 15va to replace the std TX supply to the Burson I/V. I also replaced the recs with hexfred (i'd had them for months but not got round to putting them in!) I removed the original TX supply to the board and put my new TX feed down. The circuit is now 15va@+/-15v, Hexfred, Mundorf 22,000uF on both rails, +/-12v SPowers, 270uF BGstd to Burson I/V.

I've also still got the smaller temp 7va TX's connected on the primaries. This is so i can utilise them for a couple of other 5v bits when I get some more PSU's built.

WOW!I don't know what else to say! Its up another 3 levels! Dynamics, seperation, detail, attack. I'm lost for words!!!! Will this player ever stop surprising me??? I'm not going to try and describe it becuase I've said it all before......then it gets better......truely lost for words!
 
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#805
After some furkling (which i can't take the credit for alone eh Lee!!!) I now have 2 or 3mv DC on the Burson output and have done away with the DC blocking cap.

Its all to do with a tie in on the DAC output to the +rail for the opamps!

Initial listen is that this sound in more open and dynamic. Less restricted but there are a few things about the sound I am unsure about. I think its to do with my room accoustics more than anythin else! I'll have a proper long listen and report & Also how the offset was acheived! :cloud9:
 
#806
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