Amplifiers and Operational Amplifiers: O-Level Electronics module overview of voltage gain, the transistor amplifier, op-amp amplifier configurations and the comparator

An O-Level Electronics overview of the Amplifiers and Operational Amplifiers module. Voltage gain as a ratio and in decibels, the single transistor amplifier and the need for biasing, the inverting and non-inverting op-amp gain equations and negative feedback, and the op-amp comparator, with links to every dot point.