The LM324D is a low power, quad operational amplifier from Texas Instruments. It features four independent, high gain, internally compensated, low power operational amplifiers with a wide common mode range of operation. The LM324D has a single-pole, double-throw (SPDT) switch for each amplifier. It operates from single-rail supply voltage ranges from ±1.5V to ±16V, making it ideal for a variety of applications. It features a low quiescent current of only 0.8mA, enabling it to be used in battery-powered applications. The LM324D also features an output current capability of up to 30mA, allowing it to be used in applications with higher current requirements. Other features include a high common-mode rejection ratio, fast output response time, and high gain bandwidth of 0.5MHz.