The simple circuit idea I presented here is – or was – a classic textbook design. But it is in fact an adaptable controller/driver circuitry. It is just tailored to operate the MCA-35B electromagnetic ...

It doesn’t have to be that complicated, though, as this simple two-wire power-and-data ... the twisted pair is a power supply and decoder circuit, which sends 9 volts up the line to power ...

The new system can draw energy from much wider electromagnetic swaths: 100MHz to 15GHz. Even better, the sensors that harvest the energy are simple to make. To print the circuits on paper or paper ...