LM324 Low Power Quad Op-Amp IC (DIP-14)

The LM324 is essentially the LM358's bigger sibling, packing four complete op-amp channels into a single DIP-14 package instead of just two, while keeping the same convenient single-supply operation that makes it easy to use in battery-powered and microcontroller-adjacent circuits. That extra channel count matters in projects that need several independent analog stages at once, such as a multi-sensor amplifier board, a four-channel audio mixer preamp, or a circuit running several threshold comparators side by side, since combining them onto one chip saves board space and parts count compared to wiring up multiple dual-op-amp chips. Its widespread availability and low price make it a practical default pick whenever a design needs more than two amplifier channels.