Which type of amplifier can be used to drive a relay coil that requires more current than the rated output of a logic circuit?

A buffer amplifier is an ideal choice for driving a relay coil that demands more current than what a logic circuit can provide. This type of amplifier is designed to have high input impedance and low output impedance, making it effective in transferring a signal without significantly loading the preceding stage.

When driving a relay, the buffer amplifier can source or sink the necessary current to operate the relay coil without risking damage to the logic circuit. Unlike some other amplifier types, which may alter the signal or require additional stages of amplification to match the relay's current requirements, the buffer simply provides a means to increase the current capacity while maintaining the original signal's integrity.

This is particularly important in digital electronics where logic circuits often work with low power and limited current. The buffer amplifier acts as an intermediary that effectively isolates the logic circuit from the high-current load of the relay.