74HC151 An 8-Digit Multiplexer IC (74151 IC) DIP-16 Package CD4017 20A @125V AC Switching Mode

20A @125V AC Switching Mode ON-ON Structure DPDT Type Locking Material Plastic and Metal  Dimension(LxWxH) 31x25

then do not release the first button，just release the second button

35 x 60 x 9mm/ 1

Resistance Value 680 ohm Color Code Blue

The TOSHIBA TLP541G is a  programmable Controller

74HC151 An 8-Digit Multiplexer IC (74151 IC) DIP-16 Package CD4017 20A @125V AC Switching Mode74HC series ICs are High speed logic gates with very low power consumption that utilize advanced silicon gate CMOS technology and 74HC151 is one of them. It has balanced propagation delay and transition times. 74HC151 ICs contain a single 8 channel digital multiplexer with binary control input A, B, and C and an Active Low enable input. These three inputs can select the 1 to 8 output line. 74HC151 ICs provide inverting and non inverting output. The