Devise a circuit, using simple gates, for a security lock. It has 10 input switches, and so requires the user to remember a 10 bit number. To store the ‘password’ there are a further 10 switches...

Devise a circuit, using simple gates, for a security lock. It has 10 input switches, and so requires the user to remember a 10 bit number. To store the ‘password’ there are a further 10 switches inside the secure cabinet.

What is a data demultiplexer? Draw up a truth table and then devise a logic circuit for a four-line demultiplexer.