Even so, if you have done a little bit of writing in the BASIC language in the past, you might think of the “if, then, else” as a programming statement meaning "If X is True, then do Y, else (otherwise) do Z." Comparison circuit with a comparatorBefore we actually build our comparator circuit, we first must go over in detail the pinout of an LM393 comparator IC, so that you know what each pin is and.Looking at Window Comparator Circuits. Then the transistor will turn on.For those who write computer programs, the "if, then, else” statement is a piece of cake, but it may be unfamiliar to hardware engineers who build electronic circuits. So the comparator-1 output is High. In this condition, the input voltage at the non-inverting terminal (IC Pin 3) of the comparator-1 is greater than the inverting terminal (IC Pin 2) of the comparator-1. Then LM358 IC again compares this voltage with the reference voltage.These comparators compare the audio voltage signal with a reference voltage. Of LM358 dual op-amp IC’s, each LM358 contains two comparators inside. A simple VU meter consists of a no.
The name ‘operational amplifier’ is commonly abbreviated as Op-Amp.Op-Amps have the following major features:(2) The amplification factor changes by the amount of negative feedback.(3) High input impedance, and low output impedance amplifier.(4) Amplifies the voltage difference between the (+) and (-) input terminals.The function described in (4) above is an original function that Op-Amps have. 741op amp, lm358 op amp, TTL(7400 series) and CMOS (4000 series) logic ICs.The LM358 datasheet describes it as an 8-pin dual operational amplifier, with two operational amplifier circuits included in one package. By reading both these articles, you will have a better understanding of comparators.Non-linear IC Applications: Regenerative comparator circuits using op-amps. Lm358 Comparator Circuit Plus And MinusIt is a circuit that compares two signals, and then outputs a High or a Low value if one input level becomes higher than the other input level.As an example, 5V is applied to the IN 1(-) terminal of the amplifier as the reference value, and another signal is applied to the IN 1(+) terminal. The LM358 can be used with a single power input, and I think it is easy to use for electronic projects.I will explain using the LM358 Op-Amp as a comparator. Having two power inputs, such as +5V and -5V, is a bit troublesome to use for building simple electronic circuits. Datasheets for other Op-Amps that you often see have two plus and minus power supply symbols, such as V+ and V-. It is easy to use it.Pins 4 and 8 are terminals common to each amplifier for GND and DC power, respectively. One amplifier has only two input terminals and one output terminal. Free xbox booter no downloadThis makes it convenient for removing or replacing the parts later. It is good to solder the parts to the universal board, but for the experiment, first just place the parts on the breadboard. This is a typical comparator circuit. Let us confirm the function of the comparator by experimentsI built a circuit as shown in Figure 2 using the LM358. This is the basic operation of a comparator. The output will switch from High to Low when the signal is reduced to below the reference value. Erj 145 planeThe voltage on pin 3 is taken between a 22kΩ fixed resistor of and a 50kΩ variable resistor. The actual measured value was 2.4V. Pin 2 is 2.6V, which is half of 5.2V, because the voltage of 5.2V is divided by two identical resistors. Pin 8 is 5.2V because it is directly connected to the power source. Connect four 1.2V rechargeable batteries in series for the power source, whose calculated value was 4.8V, but the measured value was 5.2V. Circuit diagram used for the experiment and place parts on the breadboardI determined voltages on each terminal by calculating and by actual measurement, and the values are shown in Figure 3. When the voltage on pin 3 is gradually increased from 0V by adjusting the 50kΩ variable resistor, the output voltage on pin 1 suddenly increases to about 3.4V. Figure 5 is a graph showing the changes in the voltage on pins 3 and 1 by changing the resistance value of a 50kΩ variable resistor. Voltages on each pin by calculation and actual measurement Changes in the output on pin 1 with reference to the voltage on pin 3As shown in Figure 4 (a) to (e), connect two multimeters to the circuit and observe the change of the input voltage on pin 3 and the change of the output voltage on pin 1 at the same time. This voltage was 0 to 3.6V in actual measurement.Figure 3. When the resistor is the maximum of 50kΩ, the voltage on pin 3 is taken between the 22kΩ and 50kΩ resistors so it is 3.6V in the calculation.In other words, the voltage applied to pin 3 can be continuously adjusted between 0 and 3.6V using the variable resistor. Input voltage on pin 3 vs output voltage characteristic on pin 1. Connect multimeters to observe voltage changes on pin 3 and pin 1Figure 5. If the voltage on pin 3 rises slightly above 2.6V, 3.4V will be output on pin 1, and if it drops below 2.6V, the output will be almost zero.Figure 4. As you can see from the voltage display in Figure 4 (b) to (d), it seems that there is a threshold value just around 2.6V. Please try to challenge the OP-Amp. In addition, various application examples can be considered. I think that various applications can be made by using the function of this comparator.For example, if you use a CdS whose resistance value differs depending on the light instead of the resistance connected to pins 2 and 3, it is possible to switch something depending on the intensity of the light. This time, when the voltage on pin 2 was fixed, and the voltage on pin 3 was gradually increased from zero, the voltage on pin 1 became High with the voltage just exceeding the voltage on pin 2.On the contrary, if the voltage of pin 3 is kept constant, and the voltage on pin 2 is gradually increased from zero, the level on pin 1 was initially High, but drops from High to Low just above the voltage on pin 3.
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