MR-1  I2S out Mod   MR-1 is nice digital audio player especially for High Resolution audio format but it has no digital out port unfortunately.   I made modification of I2S digital out for my DAC.     MR-1 use DAC chip DSD1702. http://focus.ti.com/lit/ds/symlink/dsd1702.pdf  ...

Quote:   I have no objective mechanical measurement result for these modification.   Following is my impression.   TOSLINK -> SPDIF:  Noise floor improvement.  High tone impacts are better. SPDIF -> I2S:  This was big change.  Center dizzy feeling was eliminated. Smashed feeling...

Quote: No.  No sampling rate will be changed for output. 16/44.1 is iHP's max. sampling rate.   I think better jitter elimination is performed by higher frequency clock.

Quote: Better resolution sound.    This crystal is audio master clock for CPU. Be realized any connection.

Crystal resonator replacement   11.2896MHz  ->  33.8688MHz    

iHP I2S OUT MOD   I succeed I2S out mod of my iHP-120.     I2S signal from UDA1380 Philips Stereo audio coder-decoder. http://www.nxp.com/documents/data_sheet/UDA1380.pdf   Pin10: Bit clock Pin11: Word clock Pin12: Data ( and ground from GND)       I use...

Quote: My  Volumite wiring.   OPUS controller terminal                  Volumite terminal G                                                    GND SDIN                                               SDA SCK                                                SCL...

Quote: Roughly 6 - 7 hours with 1000mAh Li-Po battery.   I am using (external) Li-Po battery charger. (for Radio-Controlled Car) To add battery charging circuit, LTC4070 seems good and easy...

My OPUS DAC portable  

Thank you very much for your kind support, ryuzoh. I am very happy with this metal S/PDIF mod especially for cable compatibility (and of course better sound quality)   And congratulations for your company launch and Fi.Q / MB pre-order starting! I hope you and your colleagues will have...

iHP metal S/PDIF mod   I succeeded to get metal S/PDIF out with iriver iHP-120 ,140. (same as coax mod but I don't use coax jack and cable...)   Use iHP's line-in mini-jack for S/PDIF metal out for easy modification. S/PDIF out signal is "R" with this wiring.   I cut pattern...

Quote: mini BNC with coax cable sounds good idea I chose  easy way "mini stereo - mini stereo" because of cable compatibility.  

Cio MB - Coax Mod   I add coax-in port for my coax mod iHP.   This DAC has 2 blank solder pad for S/PDIF input. Easy to add coax port.   CS8416 receiver has RXP0 - 7 = 8 AES3/SPDIF Input and RXP 0, 2, 3 is available with this DAC. ( RXP 2 is occupied for optical TOSLINK)...

Balance connector of the protector is Japanese standardized JEITA RC-5204.

Fortunately, I had chance to try this Hirose connector and compare to Kobiconn one. Hirose's connector is really nice, Small, High quality, Good stiffness, Precise and Easy. (Secure feeling with Latch function) Especially this Hirose type connector is easy to buy cable connected Jack, easy...