Bill of Materials

You should populate U1 with a Burr Brown/Texas Instruments OPA2134PA.

It is recommended to use a 12V 500mA center-positive power adapter.

Capacitors

C1/C2: Nichicon UKA1H101MPD - 100µF op-amp input coupling
C3/C4: Murata RDE5C1H102J0K1H03B - 1nF op-amp pole splitting
C5/C6: Nichicon UKA1V221MPD - 220µF op-amp output coupling
C7: Chemi-Con EKZN250ELL471MJC5S - 470µF power coupling
C8: Murata RDE5C1H104J2K1H03B - 100nF power coupling

Resistors

R1/R2 - YAGEO MFR-25FBF52-270R - path for audio input to ground
R3/R4 - YAGEO MFR-25FBF52-100R - path for feedback to ground
R5/R6 - YAGEO MFR-25FBF52-680R - path for feedback to U1
R7 - YAGEO MFR-25FBF52-4K7 - LED current limiting resistor

Miscellaneous Components

J1/J2 - Same Sky SJ1-3535 - stereo headphones in/out jacks
J3 - Same Sky PJ-102AH - DC power jack
U1 - TE Connectivity 2485264-1 - 8-DIP socket for op-amp
D1 - Kingbright WP7113VRVC1C - LED power indicator