How many transistors are required for and gate?
A NAND gate is 1 transistor per input. A NOR gate is 1 transistor per input. An AND gate is basically a NAND gate + a NOT gate, so it takes 1 transistor more than a NAND gate.
How are NPN transistors used to make logic gates?
Introduction: Logic Gates With NPN Transistors These circuits are extremely easy to understand. 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.
How many transistors are there in a two input gate?
A 2-input NAND gate requires 4 transistors.
How to build an AND gate using NPN transistors?
The list of components required to build an AND gate using an NPN transistor are listed as follows: Two NPN transistors. (You can also use PNP transistor if available) Two 10KΩ resistors & one 4-5KΩ resistor. One LED (Light Emitting Diode) to check the output. A Breadboard. A +5V Power supply. Two PUSH buttons.
What happens when you replace a NPN gate with a PNP gate?
When we replace the NPN transistors of the Nand gate with PNP transistors, we get an Or gate: Replacing one of the NPN transistors of the Nand gate with a PNP transistor moves the output 0 to a different combination of inputs as follows:
How are transistor gates used in NAND logic?
Transistor NAND Gate. 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.
What should resistance be for PNP logic gates?
I could not find any website with information about logic gates with PNP transistors; for our purposes, the following circuits work fine. As a general note, when using a voltage of around 5.5-5v, the resistance at the base of the transistor should be about 10kΩ, while the resistance of the emitter or collector should be about 1-5kΩ.