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 ...

On one end of the twisted pair is a power supply and decoder circuit, which sends 9 volts up the line to power the PIC sensor. The decoder is based on a CD4538 dual monostable multivibrator, set ...

Even better, the sensors that harvest the energy are simple to make. To print the circuits on paper or paper-like polymers, the researchers use an inkjet printer and add an emulsion of nanoparticles.