How can I create a decoder and a multiplexer in a circuit? The decoder has a 3 bit select input and has 8 ouputs. The multiplexer has 8 inputs and 1 output.

Build the monostable 555 circuit on TinkerCAD, where the output is an LED.

Design a circuit using a Multiplexer, (((USING A MULTIPLEXER NOT A DECODER))) that has two inputs X, and S, where X represents an 8-bit BCD number,S is a sign bit. The circuit has one output Y, which is the Binary representation of thesigned-magnitude BCD number. A negative output is represented in the Binary 2’scomplement form.