74HC47 ( BCD to 7-Segment Decoder) 085 TIP102 is a silicon NPN

TIP102 is a silicon  NPN power transistor in monolithic Darlington configuration

Connection speed: 10/100 Mb

the phototransistor saturated

You can connect this board directly to 5V systems (5V power in to VCC) and the SDA and SCL pins will be at 5V levels

74HC47 ( BCD to 7-Segment Decoder) 085 TIP102 is a silicon NPNIntroduction : 74HC47 is a BCD to 7 segment latch decoder driver with four address inputs (A, B, C, D), a latch enable input (LE), a ripple blanking input (BI), a lamp test input (LT), and seven segment outputs (a to g). When LE is LOW, the state of the segment outputs (a to g) is determined by the data on A to D. When LE goes HIGH, the last data present on A to D are stored in the latches and the segment outputs remain stable. When LT is LOW, all the