Logic circuits perform logical operations on the behalf of boolean logics. We start by assuming that d1 is off and d2 is on.

Logic Gates Using Diodes And Transistors Circuit Fever Made For Electronics Hobbyist

### First figure shows the circuit diagram of xnor gate it uses npn transistor.

**Circuit diagram of and gate using diodes**. These four gate are connected internally as shown in below pin diagram. The list of components required to build an and gate using an npn transistor are listed as follows. Discrete and gates may be realized by using diodes or transistors.

Thus the diode anode the output will be logic 0. The inputs represented as x and y may be either 0v or 5v correspondingly. The circuit schematic symbol of a diode is shown in figure 5.

A 5v power supply. The output is represented by z. Logic circuits are primarily implemented electronically using semiconductor diodes or transistors but it can be constructed using different basic logic gates which are implemented by electromagnetic relays fluidics molecules optics or even mechanical elements.

Here we are going to use ic 74ls09 for demonstration this chip has 4 and gates in it. The circuit driving voltage v is applied to the parallely connected diodes and the output is collected as the voltage drop at the diodes. So in calculators computers and manly digital applications use this gate.

Diode schematic symbol and actual picture of a common 1n914 diode the black stripe in the picture is the cathode. One led light emitting diode to check the output. Circuit diagram and components required.

This gate is mainly used in applications where there is a need for mathematical calculations. In logic gates the terms high voltage level means 5 v and low logic level means 0 v or ground. Interconnecting or and and gates.

When the voltage at a and b terminals are at opposite logic state a voltage of higher voltage minus lower voltage minus 12v voltage drop. You can also use pnp transistor if available two 10kw resistors one 4 5kw resistor. And gate can be designed by using two simple diodes.

We make a connection of 2 and gates and 1 or as shown on the picture. This method works fine when the circuits are simple but there are problems when you have to make interconnections with such gates. In the diode of and gate when both the inputs are of same value x5v and y 5v then the diodes are in off condition.

Here is an unusual method of performing exclusive functions using one transistor four diodes and 2 resistors. Hence comparing the schematic symbol to the pn junction in figure 4 we see the anode is the p type semiconductor and the cathode is the n type semiconductor. Diodes and diode circuits tlt 8016 basic analog circuits 20052006 5 assumed states for analysis of ideal diode circuits example 33 circuit solution by assumed diode states analyze the circuit illustrated in figure 39a using the ideal diode model.

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