Taking advantage of the superiority of valve controlled electro-hydraulic excitation system with wide vibration frequency and adjustable amplitude, a rotary valve controlled electro-hydraulic ...

For improving the vibration waveform amplitude and controlling the vertical shift flexibly, a novel structure for waveform control of twin rotary flowrate valve controlled vibration exciter is ...

But aside from sealing, poppet valves don’t offer many advantages. Still, engineers kept pushing: better springs, VVT, and all kinds of breathing tricks: variable intake manifolds, forced induction, ...

The schematic for the project shows how to connect the rotary dial (salvaged from an old telephone) to both a 7-segment display and a collection of ten LEDs. The project write-up includes links to ...