A frustrated Justine Haupt came up with an unorthodox solution: she designed and built a mobile phone with a rotary dial that ... a power switch that physically slides on and off, and a curved ...

Such has been the success of the mobile phone that in many places they have ... The basic form of the circuit is built around a crosspoint switch array, with interfaces for each line and a ...

[hw640] has put together a well written and detail packed explanation of how to interface with a digital rotary switch. These digital opto encoders have just two outputs with four possible logic ...