The LM324D from STMicroelectronics is a quad general-purpose operational amplifier, allowing the user to combine up to four single amplifiers into a single package. It features low power consumption, high speed and high gain accuracy. It also includes a common-mode range extending both above and below its obligatory ground. The LM324D is suitable for applications such as active filter implementation, precision rectifiers, peak detectors, and voltage or current comparators. It provides a total output current of 320mA, a supply current of 300µA and operates from -40°C to +85°C.