How to use LM358 as voltage comparator?
To use LM358 as a comparator, we need to connect the power source with the Vcc and GND pin of the LM358 IC to activate the IC. Then, we need to provide two input voltages to the Op-Amp for comparison. Now, we can get an output from the Op-Amp.
How an op-amp can be used as a voltage comparator?
An op-amp can function as a comparator because it combines a differential input stage with very high gain. A voltage-reference IC or a resistive divider can be used to generate a threshold voltage for comparator circuits.
What is the purpose of the LM358 op-amp?
The LM358 is a dual operational amplifier in a single package. It is perfect for use anywhere where a operational amplifier circuit is required and can be used for building sensors, amplifiers, triggers, etc.
What is the maximum output voltage for LM358?
They can operate at supply voltages as low as 3.0 V or as high as 32 V, with quiescent currents about one−fifth of those associated with the MC1741 (on a per amplifier basis).
Can I use any op amp as a comparator?
It is invalid with current-feedback (transimpedance) op amps that have very low impedance at their inverting inputs. For this reason, they should never be used as comparators. The actual characteristics of the input impedance and the bias currents must be considered.
Why is an opamp not suitable for usage as a comparator?
Using an op amp as a comparator may lead to difficulties for three major reasons: speed, logic drive capability, and various effects of input structures. Comparators are designed to work with large differential inputs, while op amps are intended for closed-loop operation with both inputs at very similar potentials.
Why is LM358 used as comparator?
LM358 as Comparator
In electronics, a comparator is a device that compares two voltages or currents and outputs a digital signal indicating which is larger. It has two analog input terminals, V+ and V- and one binary digital output that is low when V- is greater and high when V+ is greater.
Is LM358 a good op-amp?
There are much better opamps available for sensible prices, and for the most part there's no good reason to use an LM358 in any audio circuit. However, this opamp has some useful characteristics, and it's very low power, which may well be just what you need.
Does LM358 need negative voltage?
It does. For the given circuit it does not matter which signal (except fixed 0) - it would allways need a negative ouput from one of the OPs. The signal just decides which OP would need the negative voltage. So the output would be essentially always be near zero.
What is the output of LM358 5V?
The LM358 output range goes from (+V -1.5V) to (-V +1.5V). So if you power it with 5V and GND, the output will be between 1.5V and 3.5V.
Can we use LM741 instead of LM358?
Conclusion. Both the LM741 and the LM358 are popular general-purpose op-amps, but when the features are compared, the LM358 comes out on top in every category.
What is the input voltage of lm358p?
For example, the LM358 series can be directly operated from the standard +5V power supply voltage which is used in digital systems and will easily provide the required interface electronics without requiring an additional ±15V power supply.
What is the difference between a voltage follower and an emitter follower?
A voltage follower acts as a buffer, providing no amplification or attenuation to the signal. The emitter follower or common collector circuit configuration acts as a buffer, presenting a high impedance to the circuit that is driving it, while offering a lower impedance output.
Why use a voltage follower?
A voltage follower can be used as a buffer because it draws very little current due to the high input impedance of the amplifier, thus eliminating loading effects while still maintaining the same voltage at the output.
What is the difference between voltage follower and op-amp?
A voltage follower (also known as a buffer amplifier, unity-gain amplifier, or isolation amplifier) is an op-amp circuit whose output voltage is equal to the input voltage (it “follows” the input voltage). A voltage follower circuit has a very high input impedance.
What are the disadvantages of op-amp as comparator?
One of the biggest challenges to using an op amp as a comparator is dealing with the op amp's differential input voltage limits. Many op amps, especially bipolar input op amps, have anti-parallel input diodes, also called back-to-back input diodes, across input pins n plus and n minus.
What is the difference between op-amp comparator and comparator?
The primary difference between opamps and comparators is the presence/absence of phase compensation capacitance. Opamps require phase compensation capacitance to prevent internal oscillation, especially when configuring negative feedback circuits.
How does a voltage comparator work?
A comparator compares two input voltages and outputs a binary signal indicating which is larger. If the non-inverting (+) input is greater than the inverting (-) input, the output goes high. If the inverting input is greater than the non-inverting, the output goes low.
Do op-amps amplify voltage?
An operational amplifier (op-amp) is an integrated circuit (IC) that amplifies the difference in voltage between two inputs.
What are the 3 main limitations found in opamp based amplifiers?
The main limitations are the open loop gain, the high frequency limits and the slew rate. Open loop gain is large in an op amp, but not infinite. Op amps are usually internally compensated, which means they have one dominant pole that results in stable operation with normal resistive feedback circuitry.
What is the only drawback of op-amp?
One notable drawback is their power supply requirement, necessitating symmetrical power supplies with equal positive and negative voltages. Additionally, op-amps are ill-suited for high-frequency applications due to their limited bandwidth and phase response.
What type of op-amp is LM358?
The LM358 is a low-power dual Op-Amp with two independent high-gain and frequency compensated operational amplifiers. It is designed to operate from a single power supply over a wide range of voltages from 3 to 32V.
What is the difference between LM358 and LM393?
Can I use LM393 instead of LM358? The LM358 and LM393 might seem outwardly similar, but the LM358 is an operational amplifier with linear output, and the LM393 is a comparator with a digital output, and they cannot be interchanged.
What is voltage comparator using LM339?
The LM339-MIL device consists of four independent precision voltage comparators with an offset voltage specification as low as 2 mV maximum for all four comparators. These comparators were designed specifically to operate from a single power supply over a wide range of voltages.
What is a good alternative to LM358?
Other op-amps with similar specifications include LM2904 (dual channel), LM2902 (quad channel), LM158/LM258, LM741; either of these can be used as a replacement for LM358 or LM324, respectively.
