Although I would really like the schematics for the player (for obvious reasons) I respect your choice not to release them into the public domain due to copyright, etc.
I was pondering though how you came across them?
Through the Denon service network as you suggest?
How willing are Denon to release these to Joe public?
Thanks for the previous posts, btw. 😉
I was pondering though how you came across them?
Through the Denon service network as you suggest?
How willing are Denon to release these to Joe public?
Thanks for the previous posts, btw. 😉
I am your average joe public and I just ordered it, it comes with the schematics on paper and the whole service manual including schematics on a cd.
Approx 3 weeks for delivery and €40.
If they give you a hard time ....just say it is part of your decison process before buying, I don't see your reseller turning you down with that.
R/Michael
Approx 3 weeks for delivery and €40.
If they give you a hard time ....just say it is part of your decison process before buying, I don't see your reseller turning you down with that.
R/Michael
OK, the DVD player is almost mine - mwahahaha, ahem (£680 UK).
Just a quick question though - what are the rail voltages inside the player? (I'd like to design a linear power supply for it before purchasing and as you've already got your hands dirty I thought it best to ask you).
Cheers for all the picture posts BTW - nice
Just a quick question though - what are the rail voltages inside the player? (I'd like to design a linear power supply for it before purchasing and as you've already got your hands dirty I thought it best to ask you).
Cheers for all the picture posts BTW - nice
Good for you!
The audio board has +-9v regulated by a 7809 and 7909 by JRC.
From the +9v you get the analog 5v supply to the dacs through a 7805 and from the 5v analog dac supply you get the 3.3 digital supply through a BA033T all but the +-9v on board.
Unless you are planning anything significantly better then the 78xx you might consider just adding a L-C filter where the 9v supplies enter the board and spend your effort on replacing the NJM2068 and BA1521 Op amps, or you could do both.
Either way I encourage you to listen to it for a few weeks before you decide where to start.
The video section uses +-5v from a set of JRC 78/7905 off board.
Beyond these you have a few 5, 3.3, 2.5 and 1.8 volt digital supplies for control and processing on the main and video boards.
The audio board has +-9v regulated by a 7809 and 7909 by JRC.
From the +9v you get the analog 5v supply to the dacs through a 7805 and from the 5v analog dac supply you get the 3.3 digital supply through a BA033T all but the +-9v on board.
Unless you are planning anything significantly better then the 78xx you might consider just adding a L-C filter where the 9v supplies enter the board and spend your effort on replacing the NJM2068 and BA1521 Op amps, or you could do both.
Either way I encourage you to listen to it for a few weeks before you decide where to start.
The video section uses +-5v from a set of JRC 78/7905 off board.
Beyond these you have a few 5, 3.3, 2.5 and 1.8 volt digital supplies for control and processing on the main and video boards.
A 8 said:
What do you recommend to replace the NJM2068? I have a few AD8620s, but the NJM part is bipolar input whereas the AD8620 is jfet intput - would it make a difference?
I think there are plenty of threds describing pros and cons with different op-amps so you should be able to ***** which ones you are most likely to agree with.
The design is textbook so there are no exotic sollutions in the 2900, you should be safe with the 8620 if you want to give it a go.
The design is textbook so there are no exotic sollutions in the 2900, you should be safe with the 8620 if you want to give it a go.
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