Are your jellybeans getting stale? [lcamtuf] thinks so, and his guide to choosing op-amps makes a good case for rethinking ...

There are plenty of tube amplifiers now being manufactured ... An NE5532 steps in for the op-amp buffer role, making for a very simple circuit. Power comes from a set of four 18650 Lithium ...

Depending on your application, you can optimize each circuit's dynamic impedance and current range through a judicious choice of op amps and resistor values.

The amplifier used in the BTR17 is a THX AAA 78+ that was previously used in FiiO’s M23 DAP. The four-channel, fully balanced design uses eight op-amps in parallel for robust power with a ...