SD-Card-Activity-LED-Driver Switches on and off an LED based on SD Card activity Components C1: 0.1uF SMD 0805 D1: LED SMD 0201 Q1: BSS138 R1: 2K SMD 0805 R2: 330 SMD 0805 U1: 74LVC1G04 Conn_LDO: AMS1117-3.3V Buck Module LDO