All the electronics is on one chip. The other discrete components are the battery, keyboard including power on/off switch and LCD screen. The circuits on the chip include a debounce circuit, so when you press a key once it registers as one pulse, even though a series of very rapid pulses is...
Depending on the application, the industry uses one of the following three methods, listed below in the order of increasing power level:
1) A charge pump: lets the potential energy built up in a row of parallel capacitors then switches to connect the capacitors in series to add up the...