Using the D-type as a Bistable Multivibrator or as a Flip-Flop Circuit
The diagram illustrates how a 4013 IC may be set up for testing its fundamental bistable operation and how it can be further applied for practical uses.
The testing is done with the following steps:
Procure the parts shown in the figure, along with the veroboard, cut into the specified size.
Gently adjust and fix the IC on the veroboard somewhere over the center of the board by soldering.
Terminate all the pin-outs as directed in the diagram by soldering the connections correctly.
After all the connections are made, have a quick glance and make sure that all have been wired as per the diagram, if possible brush-clean the solder side with thinner.
Finally connect the circuit to the specified power input. You should find the following results:
The astable starts immediately, supplying the clock pulses to the IC 4013’s clock input. The astable clocks can be witnessed through LED1.
However the output Q produces a “divide by two” output of the input clocks, presenting a perfect flip-flop action.
Here, assuming initially the clock generates a logic zero pulse, Q is off, and Q‾ being the complementary to Q, is at logic high level.
Since Q‾ is connected to the data input, it also is at a high logic level, so that now it’s ready for the toggling action.
The first positive clock input signal puts Q‾ to a logic high level, the action prompts the data input to shift its high data information to Q, switching it to a logic high (LED #2 illuminating). The action also simultaneously switches Q‾ to a logic zero, rendering the D input inactive, until the next positive clock is received when the D input is again “charged up” for the toggling action but only after the following high clock pulse (LED #2 shuts off) is detected.
The graphical illustration of the clocks at the clock input and the Q output of the IC shows how the configuration is able to double the received clock’s time period at the Q output.
The configurations can be repeated by connecting the modules in series for getting the time period to any desired lengths, but in multiples of two.
Set Reset Actions: Yet another important feature of the IC which enables the bistable operation through two different inputs. The set up shown can be simply built with the help of the diagram.
Assuming Q‾ to be high initially, pressing S1 instantly forces the output pairs to change making Q go high. Pressing S2 now, just flips the status of the output to its original position.