nFORCE said:Hi,
I have this board on hand, only one 74HC14 SMD on board, all are transistor, many pieces, all SMD.
Output is TWO of Mosfet.
Will post the picture at tonight.
nFORCE.
kst said:Hi there,
DFR9000 is not the first philips set to use this 2 channel UCD module.
The first set to use UCD are mini Hifi sets 3-4 year ago. With rating 2x100W, 2X150W and 2X200W( 2module BTL connection).
Same PCB for the UCD module with some components change (for the better).
classd4sure said:Some powered PC speakers were based on SODA.. what's the difference anyway?
marconist said:
The older sets are class D amplifiers, but not UcD !
This makes exactly the difference between between good vs excellent output amplifiers ......
classd4sure said:Some powered PC speakers were based on SODA.. what's the difference anyway?
marconist said:Before I bought the DFR9000, I bought the servicemanual. (€25,- at
http://www.doknet.nl/eng/index.html
Its in PDF with all schematic's. The poweramp is indeed a "real" UcD with feedback behind the coil and the small print is build with components, so no IC's there. The (switching) PS is very complicated and that is probably the cause that the DFR9000 acts so good on pulse basses in modern music. You certainly do not miss big elco's.
compie said:
marconist: Could you post the schematic of the DFR9000?
What's the whole deal about IC's or no IC's in a class D amplifier?marconist said:Before I bought the DFR9000, I bought the servicemanual. (€25,- at
http://www.doknet.nl/eng/index.html
Its in PDF with all schematic's. The poweramp is indeed a "real" UcD with feedback behind the coil and the small print is build with components, so no IC's there. The (switching) PS is very complicated and that is probably the cause that the DFR9000 acts so good on pulse basses in modern music. You certainly do not miss big elco's.
The analog preamp is build around the TDA7468D which I think is a sota audio IC.
If you open the box it looks very well build and has a fan to cool ps and pwramp! You can only hear it when you put your ear on the receiver. (That probably will change after a couple of years ..... so than I change the fan. )
compie said:
What's the whole deal about IC's or no IC's in a class D amplifier?
What's the difference between these two?