Been working on this layout for a while now, its already the second day :eek:. Features are:

• DIP8 opamps for L/R
• SOIC opamp for ground, either use a high current single opamp, or a low current opamp with an emitter-follower in its feedback loop
• Bypassing on all opamps via 0805 ceramics right at the power pins to ground
• 1206 resistors everywhere
• Discrete Diamond buffers for L/R, with crd ccs, all transistors in SOT23
• 2 channel design, eliminates the need to isolate the input/output jacks, and reduces current draw
• No parts requirements that require sourcing from only one place, so no shortages like recently with the BUF634, TLE2426, and OPA551
• PCB measures 49mm x 25mm, so fits my favorite case for portable, the Hammond 1455C801, with 8xAAA batteries for a long runtime, and plenty of voltage swing into the majority of headphones we use portably.