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A not gate simply inverts its input.
And gate circuit diagram using transistor. Circuit diagram of transistor based and gate. The above circuit diagram shows the simplest way to build an or gate using npn transistors. If the input is high the output is low and if the input is low the output is high. The small base current controls the larger collector current.
The input is connected through resistor r2 to the transistor s base. The transistor amplifies this small current to allow a larger current to flow through from its collector c to its emitter e. The transistors used in this tutorial are bc547 npn transistor and were added with all the above mentioned components in the circuit as shown below. The use of transistors for the construction of logic gates depends upon their utility as fast switches when the base emitter diode is turned on enough to be driven into saturation the collector voltage with respect to the emitter may be near zero and can be used to construct gates for the ttl logic family for the nand logic the transistors are in series but the output is above them.
The diagram shows the two current paths through a transistor. The below diagram represents the above explained circuit to build an and gate using npn transistor. Such a circuit is easy to build using a single transistor and a pair of resistors. In electronics a not gate is more commonly called an inverter.
Hi guys in this tutorial i will show you some npn transistor based logic gates. The base of both the transistors act like inputs and one of the emitter of either of the transistors is used to derive the output. If at least one of the inputs is high the output is low. Or gate using transistor circuit diagram.
The first version of the or gate is the simplest one it consists of two paralleled emitter followers sharing a common emitter resistor. If both inputs are low the output is high. The transistors are connected in series and their bases are used as input. On a circuit diagram it must be accompanied by a statement asserting that the positive logic convention or negative logic convention is being.
What you need a breadboard a bunch of 5k and 10k resistors and transistors a led you can use any npn type transistor for example 2n3904 bc547 bc548 bc549 etc these are basic circuits so they can be improved with diodes for reverse voltage protection for example or can be simplified xor xnor gates. It is just enough to make led b glow dimly. When the switch is closed a small current flows into the base b of the transistor. A nor gate is an inverted or gate.
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