A close second is “relay logic”. Between their place in computing and telecom history and the way a symphony of click and clatter can make a geek’s heart go pitter patter, most of us just ...

We can understand why the final design used a microcontroller, but we also think that [Alex’s] relay logic circuit is an eloquent way of doing things. He uses limiting switches as the feedback ...

PLCs (programmable logic controllers) are the control hubs for a wide variety of automated systems and processes. They contain multiple inputs and outputs that use transistors and other circuitry to ...

Electromechanical relays and pneumatic logic have been used for many decades to perform logical functions in automated safety protection systems. These circuits can be wired (or piped) to perform AND, ...