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			          Schmitt Trigger Applications
			           
 The Schmitt trigger is a comparator application which switches the output negative when the input passes upward through a positive reference voltage. http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/schmitt.html
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			          Schmitt trigger - Wikipedia, the free encyclopedia
			           
 In electronics a Schmitt trigger is a comparator circuit with hysteresis implemented by applying positive feedback to the noninverting input of a comparator or differential amplifier. https://en.wikipedia.org/wiki/Schmitt_trigger
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			          Multiplexer and Multiplexing Tutorial
			           
 Electronics Tutorial about the Multiplexer and Digital Multiplexers used in Combinational Logic circuits for the multiplexing of data signals. http://www.electronics-tutorials.ws/combination/comb_2.html
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			          Multiplexer - Wikipedia, the free encyclopedia
			           
 In electronics, a multiplexer is a device that selects one of several analog or digital input signals and forwards the selected input into a single line. https://en.wikipedia.org/wiki/Multiplexer
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			          CPU Registers
			           
 Science explained in easy language. For K-12 kids, teachers and parents. http://www.sciencehq.com/computing-technology/cpu-registers.html
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			          Processor register - Wikipedia, the free encyclopedia
			           
 In computer architecture, a processor register is a small amount of storage available as part of a digital processor, such as a central processing unit. https://en.wikipedia.org/wiki/Processor_register
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			          Counter - Wikipedia, the free encyclopedia
			           
 In digital logic and computing, a counter is a device which stores the number of times a particular event or process has occurred, often in relationship to a clock signal. https://en.wikipedia.org/wiki/Counter_(digital)
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			          Sequential Logic Circuits and the SR Flip-flop
			           
 Electronics Tutorial about Sequential Logic Circuits and the SR Flip Flop including the NAND Gate SR Flip Flop which is used as a Switch Debounce Circuit. http://www.electronics-tutorials.ws/sequential/seq_1.html
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			          Flip-flop - Wikipedia, the free encyclopedia
			           
 In electronics, a flip-flop or latch is a circuit that has two stable states and can be used to store state information. https://en.wikipedia.org/wiki/Flip-flop_(electronics)
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			          Half Adder and Full Adder Circuit
			           
 Half Adder and Full Adder with truth table is given.Full Adder using Half Adder circuit is shown.Single-bit Full Adder,Multi-bit addition using Full Adder. http://www.circuitstoday.com/half-adder-and-full-adder
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			          Adder - Wikipedia, the free encyclopedia
			           
 In electronics, an adder or summer is a digital circuit that performs addition of numbers. https://en.wikipedia.org/wiki/Adder_(electronics)
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			          Logic Gate - Wikipedia, the free encyclopedia
			           
 In electronics, a logic gate is an idealized or physical device implementing a Boolean function; that is, it performs a logical operation on one or more logical inputs, and produces a single logical output. https://en.wikipedia.org/wiki/Logic_gate
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			          Logic Gates
			           
 Logic Gates - Learning digital computer organization in simple and easy steps. http://www.tutorialspoint.com/computer_logical_organization/logic_gates.htm