Step 1: The op Amp
It is available in a TSSOP (Thin Shrink Small Outline Package) which means it is small indeed, small enough for me to demonstrate my one-off microprototyping skills.
Step 2: The circuit
The large size of the input capacitors make them too bulky to be included on board, so they shall be outside, between the input jack and volume control, and the board.
The power supply is provided by a nine volt battery, converted to dual +/- 4.5 volts by 4.7K resistors and decoupled by 220 microfarad capacitors.
A high efficiency Light Emitting Diode shall provide indication that the circuit is ON, it is fed with about 0.7 milliamperes by a 10K resistor.
Step 3: The components
The small size of these components make it very difficult for conventional point to point wiring techniques to be used. In fact the only viable means of connecting them up is to use a printed circuit board.