![]() This makes the configuration compact on the breadboard which is desired due to the large number of logic gates needed to implement larger circuit designs. Since there are no push button switches the inputs are hardwired by directly connecting the resistor from the positive 5-volt rail to the base of the transistors. This makes it so the green jumper wire can be removed. Also, the collector of the first transistor is connected to the same breadboard row as the emitter of the second transistor. AND Gate 2ĪND gate 2 is the same configuration as AND gate 1 but does not have the push button switches. ![]() If the buttons are removed inputs A or B can be turned on by connecting the input resistor from the positive 5-volt rail to the base of the transistor. These switches are not required for an AND gate but help to demonstrate how the AND gate works. The circuit diagram above is for AND gate 1 which has the two push button switches. If no input is on or only one input is on the output will be off. It is clear when looking at the truth table that the only time the output is on is when both input A and input B are on. The symbol and truth table for an AND gate is shown above. How to build AND Gates with NAND gates and NOR gates is also demonstrated. At 16:48 the AND gate is discussed in detail. With a little creativity, you can use transistors to create many more complex logic circuits, giving you the ability to build highly sophisticated projects.This video shows how to build all types of logic gates. ![]() Understanding the circuit diagram of a NAND gate using transistors can give you a much better appreciation of how digital logic works, as well as how transistors can be used in a variety of different ways. These are all examples of digital logic, which is the basis of all modern digital circuitry. For example, the OR gate, AND gate and NOT gate can all be created using transistors. By connecting multiple transistors together in a variety of ways, different logic functions can be created. This, in turn, causes the output of the second transistor to also go high, and this output can be used to control further logic elements. ![]() ![]() When either input is low, it causes the output of the first transistor to go high and therefore enables the second transistor. It consists of two transistors connected in series, with the output of one transistor being connected to the input of the other, and the base of the first transistor connected to the collector of the second. A NAND gate circuit diagram using two transistors is quite simple. When two transistors are connected together in a certain way, they can effectively act like a switch, allowing one signal to control another signal. A transistor is a three-terminal device which is capable of amplifying a small current or voltage signal, so it can be used to control and switch larger signals. What makes NAND gates so useful and why do so many electronics engineers rely on them? This can be answered in part by looking at the basic components of the circuit – the transistors. The ability to control multiple inputs and outputs with a single device is a powerful asset when designing and building any electrical or electronic project. As any experienced engineer knows, the NAND gate is one of the most important and versatile logic circuits in your toolbox. In this article, we're going to explore the remarkable world of circuit diagrams for NAND gates, specifically those using transistors. ![]()
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