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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As a result the the bulb will not glow due to low output obtained from 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. The output pins of the IC are 3,4,10,11 and input pins are 1,2,5,6,9,8,12, And these situations comprise all the situations that can arise for a 2-input NAND gate.

Frank Donald is an Electronics and Communication Engineer who loves building stuff in his free time. Let me tell you why, usage of large range of the NAND gates occupies more space and also it withdraws more power arising problems in power management to a circuit. We can see the state of the output pins with the assigned inputs in the truth table given above.

Quote and Order boards in minutes on: For this circuit, we will connect pushbuttons to the 2 inputs of the NAND gate. 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.

The pinout of the is shown below, so that you can see how to connect it in the circuit. Video games, blogging and programming are the things he loves most. The quad NAND gate chip can be obtained very cheaply from a number of online retailers for just a few cents. Each NAND gate has input pins and 1 output pin. Each output can deliver output current of about 10mA at 12V but this range can reduce as the power supply voltage reduces.


N4 was wired independently and there is no dependency on other gates. The resistors also keep Vcc from directly shorting to ground when the pushbutton is pushed down.

Frank Donald June 14, 1 Comment.

In our circuit, we will use both of these cases. When the door was closed push button switch, it apply logic 1 to the gate input. This makes cd4101 gate to change its output state from low to high.

This makes the bulb to glow indicating that the door is not properly shut. Each NAND gate has two inputs and one output.

If the door was open or it is not properly shut, logic 0 is applied to the gate input. So the LED will turn on in c4011 case. The following two tabs change content below. One place it can be obtained from is Tayda Electronics at the following link: Here in this circuit the input pins of the are connected to the supply voltage directly as shown in the diagram. When the doors are open the gate inputs will be 1 and the output of the ic 0 which will turn cd401 bulb off.

The positive terminal of the battery was connected to the pin 14 and negative terminal of the battery was connected to the pin7.

The combined action of the these four gates form cd0411 working of this IC CD However, in this circuit, we will just use one NAND gate, to make the circuit as simple as possible.

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

Closing a door will input level 0 and output level 1 causing bulb to light. Below is the breadboard schematic version of the above circuit so that you can see the exact wiring of the circuit to the chip. This way, we can see what combinations of inputs will make the NAND gate be off and what inputs make it turn on.


There we can see that the NAND gate gives a high output to all the input states except the input states 1,1. Notify of all new follow-up comments Notify of new replies to all my comments. 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. Thus, we can test out all logic levels.

Practical Electronics/IC/4011

Now let us see how this Integrated circuit works and how can we use it for our operations. First and foremost, we dc4011 give power to the NAND gate chip. However, it is a very popular chip and many electronics parts suppliers have them.

Latest posts by Frank Donald see all. 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. When we iic down on a pushbutton, it changes to a logic level of LOW. 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. These resistors function as pull-up resistors.

This establishes power to the chip. Thus, the pushbuttons, when left alone, unpressed, will normally have a logic value of 1.