So, just want to know if this is possible. I'll use five 555 Timer IC's set at different frequencies so I'm thinking the clock pulses generated should be relatively random. Then I'll feed this into a 5 bit decoder that I'll have to make myself. But will this work? I'll use a switch to be able to stop the output of the 555 Timers so they all stop at the same time at some 5 bit number which I will then decode. The thing is, I cannot use Arduino or any micro-controller etc. I'm only allowed the 555 Timer IC and the basic logic gates.