The following diagram is the circuit of CMoy headphone amplifier. Chu Moy designed a very popular headphone amplifier that’s easy to build, and it can be built small enough to fit in a pocket, power supply and all. It’s powerful enough to drive very inefficient headphones to thunderous volumes from even weak sources
CMoy headphone amplifier circuit diagram:
The op-amp used for this circuit is OPA2132PA, you may use OPA2132P or OPA2134PA as the alternative op-amp chip.
Power supply circuit for CMoy headphone amplifier:
Go to this page for the complete tutorial of CMoy headphone amplifier circuit.