MOD Counters
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MOD Counters

The job of a counter is to count by advancing the contents of the counter by one count with each clock pulse. Counters which advance their sequence of numbers or states when activated by a clock input are said to operate in a “count-up” mode. Likewise, counters which decrease their…

BCD Counter Circuit
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BCD Counter Circuit

We saw previously that toggle T-type flip flops can be used as individual divide-by-two counters. If we connect together several toggle flip-flops in a series chain we can produce a digital counter which stores or display the number of times a particular count sequence has occurred. Clocked T-type flip-flops act…

Simple LED Flasher
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Simple LED Flasher

The electronics student or hobbyist’s always likes to make various circuits for their home or school and especially ones that flashes a few lights, and there are many circuits and kits on the market that can flash any number of LED’s or lights periodically, randomly or sequentially but one very…

Frequency Division
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Frequency Division

In the Sequential Logic tutorials we saw how D-type Flip-Flop´s work and how they can be connected together to form a Data Latch. Another useful feature of the D-type Flip-Flop is as a binary divider, for Frequency Division or as a “divide-by-2” counter. Here the inverted output terminal Q (NOT-Q) is connected directly back…

Asynchronous Counter
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Asynchronous Counter

An Asynchronous counter can have 2n-1 possible counting states e.g. MOD-16 for a 4-bit counter, (0-15) making it ideal for use in Frequency Division applications. But it is also possible to use the basic asynchronous counter configuration to construct special counters with counting states less than their maximum output number. For example,…