I learned this when I tried to build a simple digital clock by feeding a low-voltage, 60Hz sine wave ( the output of a step-down transformer driven by my AC house current ) into a series of ?0 digital counters I'd assembled.
22.
In general, generators for pulses with widths over a few microseconds employ digital counters for timing these pulses, while widths between approximately 1 nanosecond and several microseconds are typically generated by analog techniques such as RC ( resistor-capacitor ) networks or switched delay lines.
23.
Like other atomic clocks the watch keeps time with an ultraprecise 9.192631770 GHz microwave signal produced by electron transitions between two hyperfine energy levels in atoms of cesium, which is divided down by digital counters to give a 1 Hz clock signal to drive the hands.
24.
Axl's eyesockets are filled, first by a " plug-and-play " Red Cross-issue eye, so cheap it only works in black and white and very low-res; and later by a more complex eyeball capable of night-vision and with a digital counter in the corner to remind him of his deadline.
