A method to recover a reference clock from a clock of unknown frequency in a simple PLD.
A device to alert the hard of hearing to significant events near them based on the audio they emit.
A device to embed Ethernet in SDI (digital video).
A simple solar tracker with a wide 180 degree acquisition angle.
An internal combustion engine that uses hydraulic pressure to store energy rather than the kinetic energy of moving parts. So, the engine only needs to run when more power is required. i.e. it stops when the car stops or coasts or breaks.
Solar oven and solar water distiller