BUY HP7710 https://www.utsource.net/itm/p/348494.html

The HP7710 is a dual operational amplifier with a DIP-8 package. It is a monolithic integrated circuit designed for use in a wide variety of applications. Features: * Low power consumption * High input impedance * Low noise * High slew rate * Wide bandwidth Applications: * Active filters * Signal conditioning * Voltage regulation * Audio amplifiers * Instrumentation amplifiers * Motor control (For reference only)