324 Quad low-power operational amplifier. +-----\__/-----+ OUT1|1 14| OUT4 -IN1|2 13| -IN4 +IN1|3 12| +IN4 VCC |4 324 11| GND +IN2|5 10| +IN3 -IN2|6 9| -IN3 OUT2|7 8| OUT3 +--------------+