Nature

Robust wireless power transfer using a nonlinear parity–time-symmetric circuit

Figure 1: Comparison between conventional and PT-symmetry-based wireless power transfer schemes as the source–receiver resonant coupling rate κ varies as a function of transfer distance d. Figure 3: ...
Wired

Wireless Brain-to-Computer Connection Synthesizes Speech

A system that turns brain waves into FM radio signals and decodes them as sound is the first totally wireless brain-computer interface. For now, 26-year-old Erik Ramsey, left almost entirely paralyzed ...
EDN

Active-filter circuit and oscilloscope inspect a Class D amplifier’s output

The increasing acceptance of Class D amplifiers has helped them gain market share from their linear Class AB brethren. That acceptance is no surprise; the advantages of Class D amplifiers are legion, ...