Tojanos Buy a brand you can trust. Pin 7 is the ground or negative supply input of the IC. Following conventional safety dstasheet, primarily these inputs also need to be assigned to a logic level, preferably to the ground terminal for the present IC, via sufficiently high value resistors. Gently adjust and fix the IC on the veroboard somewhere over the center of the board by soldering.
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Where to use CD IC The IC CD is used for counting applications, it has the capability to turn on 10 outputs sequentially in a pre-defined time and reset the count or hold it when required. It also has the capability to indicate the status of counting using Carry pin. We have 10 output pins ranging from Q0 to Q9, these pins can be connected to any load but we are using LEDs here as shown in the circuit below. This IC will increment the count from 0 to 9 Q0 to Q9 each time it senses a high pulse from the clock pin pin The output changes sequentially from Q0 to Q9 for every high pulse from the Clock pin, but this sequence can be interrupted by two pins.
They are the Clock Enable pin 13 and Reset pin 15 pins. Similarly, if the reset pin is made high. The count will reset itself back to Q0 and will stay there until Q0 is made low again.
We have another pin called the carry out pin 12th pin , this pin will stay low 0V by default. But when the IC completes counting up to 10, the pin will go high and will remain high till it counts till 5, when its 5 it will go down 0V and turn on again when it reaches The timing diagram of the IC indicating the state of Output pins and Carry pin for every high pulse signal is shown below.
CD4013 PDF Datasheet浏览和下载