One way to generate seemingly random sequences is to use a linear feedback shift register or ... and how you feed them back means you can control the pseudo-random sequence. A Fibonacci LFSR ...

he decided to roll his own controllers. This resulted in the need for a linear sensor 100 mm in length, the specs for which — absolute sensing, no brushes or encoders, easily sourced parts ...

Feedback in electrical and mechanical systems. Mathematical models of systems and linear approximations. Transfer functions of linear systems, block diagrams and signal flow graphs. Sensitivity, ...