Hey.. Thanks for your replies.. Here is how to mod the SB3. Replace the PCM1748 DAC with the PCM1748K-grade. This is the only semiconductor that was replaced. I decided NOT to replace the pwr supply with a linear one. (just for fun. It will properly be even better with the Linear version. I have to test this in near future. To attenuate the 5V switch mode Pwr supplys ripple, 2pcs Black gate Caps 220uF/6.3V N are placed On the 5V input of the SB3. C6,C11,C16,C17,C20 Replaced with a 47uF/6.3V HQ Blackgate C7 Replaced with 2pcs 47uF/6.3V HQ Blackgate C10 moved from solderpad to the pins of the DAC C12 replaced with 220uF/6.3V N Blackgate (they have no problem to handle the 8V DC supply to the opamp) furthermore an extra 220uF/6.3V N is placed direct on the supply pins of the opamp. C15 replaced with a 10uF Black gate. C19 is removed (No need of a ceramic cap on the Analog supply of the dac) Following components has replaced and mounted in the air between C21, C23 pads and centerpins of the RCA connectors. The center pins of the RCA connectors has been disconected to the PCB when mounting following six components. C21,C23 replaced with 47uF/6.3V HQ Blackgate, C22,C24 replaced with same value but styroflex versions. R12, R14 (220R) replaced with holco 33R. Last the GND of the RCA connectors has been Cutted. and two wires have been placed direct between the opamps GND and each of the RCA connectors. This way the Signal GND has been total seperated from the ground plane of the PCB..
Thats all But more can be modded.. a Ref clock can be installed, Linear 5V pwr supply.. If any have some ideas for more mods.. Please return.. +-------------------------------------------------------------------+ |Filename: 5.jpg | |Download: http://forums.slimdevices.com/attachment.php?attachmentid=4207| +-------------------------------------------------------------------+ -- Caad ------------------------------------------------------------------------ Caad's Profile: http://forums.slimdevices.com/member.php?userid=9350 View this thread: http://forums.slimdevices.com/showthread.php?t=42840 _______________________________________________ audiophiles mailing list [email protected] http://lists.slimdevices.com/lists/listinfo/audiophiles
