74HC138 (3 to 8 Line Decoder- Demultiplexer) Barrel Jack Non-contact optical switch

Non-contact optical switch

since humans don't see IR

Bridge Rectifier Case Style : SIP

This module use is very easy which you could direct control by push button on board  or by Microcontroller such as Arduino

When the parallel load input (PL) is LOW the data from D0 to D7 isloaded into the shift register asynchronously

74HC138 (3 to 8 Line Decoder- Demultiplexer) Barrel Jack Non-contact optical switchIntroduction : The 74HC138 decodes three binary weighted address inputs (A0, A1 and A2) toeight mutually exclusive outputs (Y0 to Y7). The device features three enable inputs (E1, E2 andE3). Every output will be HIGH unless E1 and E2 are LOW and E3 is HIGH. This multiple enablefunction allows easy parallel expansion to a 1 of 32 (5 to 32 lines) decoder with just four '138 ICsand one inverter. 74HC138 can be used as an eight output demultiplexer by