Type 1:
TI LME49990 (10X better than LME49710) +TI PGA2310 Digital volume control (0.5dB / step) + Freescale industrial grade MCU + TI TPA6210A2
Type 2:
TI LME49990 (10X better than LME49710) + TI PGA2310 Digital volume control (0.5dB / step) + Freescale industrial grade MCU + TI LME49610 (High current buffer) + DC Servo.
ELNA SILMIC II Capacitor, Holco 0.1% Resistor.
Input source: (Direct on board by pin connection, less than 2mm length !!!)
The new IPHONE 8/19pin socket (Confidential and Top secret !!!)
IPHONE/IPOD 30pin socket
SAMSUNG Galaxy Series / Google NEXUS S Micro USB (Line out mode), Special Thanks Orpheus Lau provide the information.
HTC / Sony mobile socket (under developement)
Remark:
Not support 3.5mm input type.
Not support China made smart phone.