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2. Flip clock - Wikipedia

   en.wikipedia.org/wiki/Flip_clock

   A flip clock (also known as a "flap clock") is an electromechanical, digital time keeping device with the time indicated by numbers that are sequentially revealed by a split-flap display. The study, collection and repair of flip clocks is termed horopalettology (from horology – the study and measurement of time and palette – and the Italian ...

3. Split-flap display - Wikipedia

   en.wikipedia.org/wiki/Split-flap_display

   The Signaltron main departure board at Praha-Smíchov station, Czech Republic (2012), manufactured by Pragotron Schematic of a split-flap display in a digital clock display An animation of how a split-flap display works Flap departure board at Gare du Nord, Paris (2007) Section of a split-flap display board at Frankfurt (Main) Hauptbahnhof (2005) Enlarged inner workings of a split-flap clock

4. Flip-flop (electronics) - Wikipedia

   en.wikipedia.org/wiki/Flip-flop_(electronics)

   Flip-Flops that read in a new value on the rising and the falling edge of the clock are called dual-edge-triggered flip-flops. Such a flip-flop may be built using two single-edge-triggered D-type flip-flops and a multiplexer, or by using two single-edge triggered D-type flip-flops and three XOR gates.

5. Counter (digital) - Wikipedia

   en.wikipedia.org/wiki/Counter_(digital)

   In a synchronous counter, the clock inputs of the flip-flops are connected, and the common clock simultaneously triggers all flip-flops. Consequently, all of the flip-flops change state at the same time (in parallel). For example, the circuit shown to the right is an ascending (up-counting) four-bit synchronous counter implemented with JK flip ...

6. Synchronous circuit - Wikipedia

   en.wikipedia.org/wiki/Synchronous_circuit

   The output of a flip-flop is constant until a pulse is applied to its "clock" input, upon which the input of the flip-flop is latched into its output. In a synchronous logic circuit, an electronic oscillator called the clock generates a string (sequence) of pulses, the "clock signal".

7. There are actual flip clocks that looks like that screensaver ...

   www.aol.com/news/actual-flip-clocks-looks...

   If you don’t have the screensaver, you’ve definitely seen it.

8. Quartz clock - Wikipedia

   en.wikipedia.org/wiki/Quartz_clock

   The next 3 decades saw the development of quartz clocks as precision time standards in laboratory settings; the bulky delicate counting electronics, built with vacuum tubes, limited their use elsewhere. In 1932 a quartz clock was able to measure tiny variations in the rotation rate of the Earth over periods as short as a few weeks. [39]

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