Anche se l'argomento caldo del momento è il futuro 115 ( o addirittura 117

) , vi segnalo questo "ultimo" Modder del Nord Europa.... interessante sicuramente per le foto dei dettagli delle modifiche , che consentiranno ai più esperti tecnicamente di valutarne la bontà
Ecco il Vichingo
http://www.xtremeplace.com/yabbse/index.php?topic=228542.0
MODIFICATIONS
- Replacing the original SMPS with the linear power module (internal mounted). External LPM also available in silver or black colour enclosures (recommended for 95 model). This mod it include:
Double AC filters for internal transformer as for the original toroid (analogue power).
R core transformer for best main AC noise isolation.
Most advanced regulators on market today for the best noise figures (output ripple & harmonics level under 3µV, at full load - 5A on 5v rail).
Remote current sensing design for best regulation at the cable connection endpoint
Extra HF filtering cell on cable connection end.
Solid filtering capacity values for both power rails (more than 100 000µF on 5v rail).
When implementing the internal LPM, it is recommended removing the multichannel board for best cooling and ventilation of the entire device, including main processor. This LPM it can work enough well with multichannel board in place and functional, but then the inside ventilation is less effective and the overall working temperature it increase...
Price - 350$ (400$ if isolated USB board)
- Improving completely the original analogue power stage on stereo board, as the filtering caps on main/digital board - DC/DC converters/PSUs). This mod it include:
Schottky all rectifier diodes, solid filtering capacities, improving the existing +/- 12v regulators.
Adding pre regulator for 5v analogue power rail, replacing all of the stock regulators for DAC chip, with ultra-low noise ones.
Improving the existing regulator for DAC`s analogue stage, improving filtering capacities for all DAC power rails.
As an alternative (very recommended for best ever results!), installing my special designed DAC PSU for the analogue power rails of the DAC chip,
and dismissing the original regulator on board. This mod option it include also improving cooling for DAC chip (add 150$).
Eventual dismissing of the headphone stage if unused, to unload the main regulators and minimise the overall inside heat dissipation.
(Sending of the main & stereo boards it is necessary for implementing this mod)
Price - 300$/450$ (-100$ if Lundahl transformers output).
- Implementing the output module. This mod it have two versions (active / passive) and it include:
1. Fully differential signal processing design (based on OPA1632), using dedicated ultra-low noise regulators (TPS) for each opamp chip.
Configuring DAC chip for 2+2 output. Special AC coupling caps configuration, for best signal transparency.
The output module is designed as a detachable approach, which it allow the user to experiment with different output circuits versions, without modifying any further on the stereo board.
A motherboard for this module, it is soldered on the stereo board, and it give access to the DAC output signals, to the +/-power lines, and to the AC coupled final outputs.
The output module experimenting board it is also available if necessary (add 50$).
Price - 350$
2. Lundahl transformers as passive output stage/module. This it mean the transformers are directly connected to the DAC chip.
No any active I/V stage, no AC coupling caps on outputs, not necessary the improvement of the analogue +/- power system, lower heat dissipation. Best ever results!
(Sending of the stereo boards it is necessary for implementing this mod).
Price 500$ (including the two Lundahl transformers price of 350$).
- Implementing the battery powered clock board. This mod it have two versions and it include:
Centralized powered clock system for the whole device. Damping mechanical mounting for clock board, to prevent any vibrations/alteration of the clock signals.
1. Epson SAW 108Mhz clock for DAC, 27Mhz and 20Mhz Abracon oscillators for main processor, and for HDMI chip, as a standard option.
2. Unified clock oscillator (SAW 216Mhz) for DAC and main processor, with high quality frequency divider (Ghz rated class device) + 20Mhz Abracon oscillator for HDMI chip (add 50$).
(Sending of the main & stereo boards it is necessary for implementing this mod)
Price: - 250$ (standard option), 300$ (divider option)
- Improvements for the asynchronous USB interface. This mod include:
Isolated digital interface for the USB board (board fully electrical isolated from the rest of the player, including grounding).
Ultra low noise regulator replacing the original one on board. Entire board powered from its own low noise linear PSU. Replacing of the stock on board oscillators with NDK ones.
Price: 250$
- Improving the data cables shielding, as cooling for main chips, and advanced grounding are included in overall final price.
Improvements for 103/103D models also available (only digital stage).