exciter; driver
Technical term in electronics and engineering for a circuit or device that drives another component, such as an oscillator or amplifier.
This oscillator circuit requires an exciter.
Compound of 励 (rei, 'excite') + 振 (shin, 'shake, oscillate') + 器 (ki, 'device'). The exact historical derivation is uncertain; the spelling is conventionally associated with the technical meaning.