Sep 21, #Working and pin configuration of the #NAND #IC CD A door opening indicator circuit using IC gate IC and working of NAND gates. CD TRUTH TABLE. The CD is the most used CMOS chip. The CD IC has 4 gates and these can be wired to create a BUFFER, Inverter (NOT) . ooÕoo This article starts with a detailed look at the operation of the Cmos It then considers the practical use of the IC in the small alarm circuit on the .

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However, in this circuit, we will just use one NAND gate, to make the circuit as simple as if. In our circuit, we will use both of these cases. And these situations comprise all the situations that can arise for a 2-input NAND gate.

This establishes power to the chip. When the door was closed push button switch, it apply logic 1 to the gate input.

Below is the breadboard schematic version of the above circuit so that you can see cd44011 exact wiring of the circuit to the chip. Frank Donald June 14, 1 Comment. Each NAND gate has two inputs and one output.

Practical Electronics/IC/ – Wikibooks, open books for an open world

Frank Donald is an Electronics and Communication Engineer who dc4011 building stuff in his free time. N4 was wired independently and there is no dependency on other ix. Quote and Order boards in minutes on: When either one or both of the pushbuttons are pressed, the NAND gate will output a logic HIGH or 1and the load connected to output will be powered on.


This IC was used since it withdraws only small power and also reduces the complexity of the circuit. When a pushbutton is pressed down, the pushbutton now makes contact across to ground.

These resistors function as pull-up resistors. The quad NAND gate chip can be obtained very cheaply from a number of online retailers for just a ccd4011 cents. The combined action of the these four gates form the working of this IC CD Each output can deliver output current of about 10mA at 12V but this range can reduce as the power supply voltage reduces.

Thus, the pushbuttons, when left alone, unpressed, will normally have a logic value of 1. First and foremost, we must give power to the NAND gate chip. So the LED will turn on in cd4101 case.

The pinout of the is shown below, so that you can see how to connect it in the circuit. For this circuit, we will vd4011 pushbuttons to the 2 inputs of the NAND gate. However, it is a very popular chip and many electronics parts suppliers have them. The output pins of the IC are 3,4,10,11 and input pins are 1,2,5,6,9,8,12, Now let us see how this Integrated circuit works and how can we use it for our operations.

Thus, we can test out all logic levels. Latest posts by Frank Donald see all. The resistors also keep Vcc from directly shorting to ground when the pushbutton is pushed down. This circuit was wired as a door open indicator which indicates the opening of door using the bulb which was connected to the output pins of the gates. The corresponding input pin will now be grounded and its logic level will change to a logic LOW now that it makes contact down to ground.


This circuit is as basic as it gets for a NAND gate circuit and it demonstrates all the possible input values that a NAND gate chip can receive and output.

When we press down on a pushbutton, it changes to a logic level of LOW. Each NAND gate has input pins and 1 output pin. Notify of all new follow-up comments Notify of new replies to all my comments.

This makes the gate to change its output state from low to high. The following two tabs change content below. There we can see that the NAND gate gives a high output to all the input states except the input states 1,1. The positive terminal of the battery was connected to the pin 14 and negative terminal of the battery was connected to the pin7.

How to Build a NAND Gate Logic Circuit Using a 4011 Chip

Here in this circuit the input pins of the are connected to the supply voltage directly as shown in the diagram.

This way, we can see what combinations of inputs will make the NAND gate be off and what inputs make it turn on. Dd4011 a door will input level 0 and output level 1 causing bulb to light.