3-bit to 8-bit decoder

3 bit to 8bit decoder Up to down: Y0(bar)→Y7(bar) Switch(input signal) up to down :G1 G2a C B A G2b Encode: G1=1,G2a=G2b=0,then e.g. CBA→111 then Y7=0,LED turn off You can use it implement adder or other functions