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LM358 Op Amp: 5 Simple Application Cricuits [Video]

Author: Iggy Date: 13 Jan 2021  1902

lm358 comparator

Introduction

LM358 is a low power dual operational amplifier integrated circuit. It is suitable for single power supply with wide power supply voltage range, and also suitable for dual power supply mode. Under the recommended operating conditions, the supply current is independent of the supply voltage. This article will introduce the circuit design using LM358.

Operational amplifier basic properties explained using LM358 dual op amp

Catalog

Introduction

I Circuit of Single Power Supply to Double current

II Circuit of Automatic AC stabilized Power Supply

III Circuit of High-current Linear Voltage Divider

IV High-end Current Detection Circuit

V 1kHz Wien Bridge Signal Generator

Component Datasheet

FAQ

Ordering & Quantity

I Circuit of Single Power Supply to Double current

Figure 2 shows a circuit composed of an operational amplifier, which converts a single power supply into a dual current. Convert 40V DC voltage to ± 15V DC voltage. When the load current is 200mA, the voltage stability is not less than 0.1%. The circuit is composed of voltage divider, voltage follower and parallel regulator. The voltage divider is composed of R1, RW, and R3, which divides the 40V direct current. And the current is conveyed to in-phase input terminal through RW.  Because the op amp is connected with the ground wire, the op amp forms a voltage follower circuit through the B-E junction of VT1 and vt2. VT1 and VT2 are -15V and +15V voltage regulators respectively. The voltage drop generated by the output of the op amp on R3 acts as the bias voltage of the emitter junction of VT1 and VT2, so that VT1 and VT2 are in the conducting state. By adjusting the boom of RW, the positive and negative voltage of output can be adjusted. When using this circuit, the input DC power must be floating, that is, no one end can be grounded.

Figure 1. Circuit of Single power supply to Double current

II Circuit of Automatic AC stabilized Power Supply

This is a fully automatic AC stabilized power supply controlled by an AC servo system. When the change of output voltage is caused by the change of input voltage or load, the circuit can quickly and automatically adjust and stabilize the output electric basket at 220V. The range of AC input voltage is 165-245V; the maximum output power is 3000W, the maximum output current is 3.6A; and the working efficiency of the power supply is more than 98%. The circuit is shown in the figure below.

Figure 2. Circuit of Automatic AC stabilized Power Supply

III Circuit of High-current Linear Voltage Divider

This circuit composed of LM317 and LM358.

LM358 is a single power supply universal integrated operational amplifier. LM317 is an integrated three-terminal regulator with adjustable positive voltage. LM358 is connected to a voltage follower, and the output voltage follows the output voltage V0 of the voltage divider. The input resistance of the voltage follower Ri≥400MΩ (Ri is equivalent to the load resistance RL of the voltage divider), and the output resistance R0≤1Ω. It satisfies the condition of (RL / R) →∞ (R is the rated resistance of digital potentiometer), so the non-linearity of load characteristic of sensor is eliminated fundamentally.

Figure 3. Circuit of high-current linear voltage divider

Since LM317 has excellent voltage stabilizing performance (the current regulation rate is about 0.3%), the load loop current I ′ 0 is allowed to vary from zero to the maximum output current of LM317. The maximum output current of common LM317 ranges from 100mA to several amperes.

In summary, this design not only fundamentally eliminates the non-linearity of the load characteristics of the voltage divider, but also solves the problem of the weak load capacity of the voltage divider.

IV High-end Current Detection Circuit

There are two disadvantages to directly sent the voltage of the sampling resistor into the single-chip microcomputer AD. First, when the current is small, the voltage at both ends of the sampling resistor is small, and the AD converter may require higher sensitivity to detect it. Second, because it is a low-end detection, the power supply output and input cannot be grounded together, and it will affect the stability of the output voltage. (Regulated output = voltage of sampling resistor + actual output voltage)

Therefore, the high-end detection circuit is designed as follows:

Figure 4. High-end Current Detection Circuit

V 1kHz Wien Bridge Signal Generator

Figure 1 is a lkHz signal generator composed of LM358 dual operational amplifiers and Rl ~ R15, Cl ~ C5 and other components.

Figure 5. 1kHz Wien bridge Signal Generator

The weak 1kHz signal generated by the Wien bridge (C2, C3, R4, and R6) is amplified by Al, and then used as buffer amplification by the two op amps A2 and A3. The output of the two op amps is inverted, thus making the single-ended Convert to double-ended balanced output.


Component Datasheet

LM358 Datasheet


FAQ

  • What is lm358 op amp?

LM358 is a dual op-amp IC integrated with two op-amps powered by a common power supply. It can be considered as one half of LM324 Quad op-amp which contains four op-amps with common power supply. The differential input voltage range can be equal to that of power supply voltage.

  • What is lm358 used for?

LM358 can be used as transducer amplifier, DC gain block etc. It has large dc voltage gain of 100dB. This IC can be operated on wide range of power supply from 3V to 32V for single power supply or from ±1.5V to ±16V for dual power supply and it also support large output voltage swing.

  • Why lm358 is used in IR sensor?

IC Lm358 is used as a comparator when IR receiver senses IR radiations. When the o/p of lm358 goes high, then LED connected at the o/p turns ON. The output pin of the IC LM358 is used to interface with PIC microcontroller.

  • How does an lm358 work?

IC LM358– LM358 consists of two independent, high gain operational amplifiers in one package. Important feature of this IC is that we do not require independent power supply for working of each comparator for wide range of power supply. LM358 can be used as transducer amplifier, DC gain block etc.

  • What is the difference between lm358n and lm358p?

The suffix denotes the manufacturer's packaging code. The 'N' is used by most manufacturers for the plastic 8-pin package. The 'P' is used by a few manufacturers for the plastic 8-pin package. Raven Luni is right, there is NO difference between the two devices, just the mfgrs.

  • How do I know if my lm358 op amp is broken?

Measure the DC voltage at the +input. then measure the DC voltage at the output. if the results are significantly different, the opamp is most likely shot. if they are the same, the opamp is most likely ok and the problem is something else.

  • What is the difference between lm386 and lm358?

The LM386 is a complete audio power amplifier, the LM358 is a dual operational amplifier. When using the LM358 e.g. as a pre-amplifier, you will have to supply a separate power amplifier.

  • What is a dual op amp?

With a dual supply op amp, the V+ terminal of the op receives a positive voltage and the V- terminal connects to negative voltage. Therefore, any input signal fed into the op amp can swing from the positive voltage supply to the negative voltage supply.

  • What is LM series?

The following is a list of LM-series integrated circuits. ... The LM series originated with integrated circuits made by National Semiconductor. The prefix LM stands for linear monolithic, referring to the analog components integrated onto a single piece of silicon.

  • How to import lm358 into LTspice?

1. Download model file and unzip.
2. Place .cir file in same folder as schematic.
3. Place "opamp2" symbol on schematic.
4. Change "opamp2" value to LMX58_LM2904.
5. Place directive on schematic ". lib LMx58_LM2904. CIR" without quotes.

Ordering & Quality

Photo Mfr. Part # Company Description Package PDF Qty Pricing
(USD)
LM358ADR LM358ADR Company:Texas Instruments Remark:IC OPAMP GP 2 CIRCUIT 8SOIC Package:8-SOIC (0.154", 3.90mm Width)
DataSheet
In Stock:52500
Inquiry
Price:
2500+: $0.09540
5000+: $0.09010
12500+: $0.08215
25000+: $0.07685
62500+: $0.06890
Inquiry
LM358ADR2G LM358ADR2G Company:ON Semiconductor Remark:General Purpose Amplifier 2 Circuit 8-SOIC Package:8-SOIC (0.154"", 3.90mm Width)
DataSheet
In Stock:On Order
Inquiry
Price:
1+: $0.40000
10+: $0.30000
25+: $0.27080
100+: $0.14760
250+: $0.14268
500+: $0.12792
1000+: $0.09840
2500+: $0.08856
5000+: $0.08364
12500+: $0.07626
25000+: $0.07134
62500+: $0.06642
Inquiry
LM358ADT LM358ADT Company:STMicroelectronics Remark:IC OPAMP GP 2 CIRCUIT 8SO Package:8-SOIC (0.154", 3.90mm Width)
DataSheet
In Stock:7500
Inquiry
Price:
2500+: $0.11082
5000+: $0.10368
12500+: $0.09510
25000+: $0.09152
62500+: $0.08938
125000+: $0.08580
Inquiry
LM358AMX-NOPB LM358AMX-NOPB Company:Texas Instruments Remark:IC OPAMP GP 2 CIRCUIT 8SOIC Package:8-SOIC (0.154", 3.90mm Width)
DataSheet
In Stock:25000
Inquiry
Price:
2500+: $0.32940
5000+: $0.31720
12500+: $0.30500
25000+: $0.30012
62500+: $0.29280
Inquiry
LM358AN-NOPB LM358AN-NOPB Company:Texas Instruments Remark:IC OPAMP GP 2 CIRCUIT 8DIP Package:8-DIP (0.300", 7.62mm)
DataSheet
In Stock:3661
Inquiry
Price:
1+: $0.90000
10+: $0.80800
25+: $0.76720
100+: $0.58910
250+: $0.52060
500+: $0.49320
1000+: $0.38360
2500+: $0.36442
5000+: $0.35072
Inquiry
LM358D LM358D Company:Texas Instruments Remark:Operational Amplifiers - Op Amps Dual Linear Package:N/A
N/A
In Stock:On Order
Inquiry
Price:
1+: $0.41000
10+: $0.30100
100+: $0.16800
500+: $0.15400
1000+: $0.11600
2500+: $0.10900
5000+: $0.10200
10000+: $0.09400
25000+: $0.09000
Inquiry
LM358DR LM358DR Company:Texas Instruments Remark:IC OPAMP GP 2 CIRCUIT 8SOIC Package:8-SOIC (0.154", 3.90mm Width)
DataSheet
In Stock:52500
Inquiry
Price:
2500+: $0.08100
5000+: $0.07650
12500+: $0.06975
25000+: $0.06525
62500+: $0.05850
Inquiry
LM358DR2G LM358DR2G Company:ON Semiconductor Remark:IC OPAMP GP 2 CIRCUIT 8SOIC Package:8-SOIC (0.154", 3.90mm Width)
DataSheet
In Stock:37500
Inquiry
Price:
2500+: $0.08120
5000+: $0.07308
12500+: $0.06496
25000+: $0.06090
62500+: $0.05481
Inquiry
LM358DT LM358DT Company:STMicroelectronics Remark:IC OPAMP GP 2 CIRCUIT 8SO Package:SOIC8
DataSheet
In Stock:92500
Inquiry
Price:
2500+: $0.10296
5000+: $0.09724
12500+: $0.08866
25000+: $0.08294
62500+: $0.07436
125000+: $0.07150
Inquiry
LM358M LM358M Company:Texas Instruments Remark:General Purpose Amplifier 2 Circuit 8-SOIC Package:8-SOIC (0.154"", 3.90mm Width)
DataSheet
In Stock:On Order
Inquiry
Price:
1+: $1.23000
10+: $1.10300
25+: $1.04720
100+: $0.80410
250+: $0.71060
500+: $0.67320
1000+: $0.52360
2500+: $0.49742
5000+: $0.47872
Inquiry

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