The LM358B is a dual operational amplifier (Op-Amp) designed by Texas Instruments, capable of operating with a single power supply and offering a wide range of voltage operations. This component is widely used in various electronic applications, including signal amplification, filters, voltage followers, and integrators due to its high voltage gain and low power consumption.
The circuit includes an LM358 op-amp, NPN and PNP transistors, and resistors that are likely configured for signal processing or control applications. The op-amp is powered, and the transistors are arranged for switching or amplification, with resistors providing biasing and current limiting. The exact functionality is unclear without embedded code or further context.
Open Project in Cirkit Designer
This circuit is a light-sensitive LED controller. It uses an LDR to detect ambient light levels and an LM358 op-amp to compare the sensor's signal with a reference voltage. The output of the op-amp drives a BC547 transistor to turn on or off a set of LEDs based on the ambient light.
Open Project in Cirkit Designer
This circuit is a sensor interface system that uses a Seeed Studio nRF52840 microcontroller to process signals from a force sensing resistor and a rotary potentiometer. The OPA688P operational amplifier conditions the sensor signals, which are then read by the microcontroller for further processing or transmission.
Open Project in Cirkit Designer
This circuit is a light-sensitive LED controller. It uses a photocell to detect ambient light levels and an LM358 Op-Amp to compare the light level against a set threshold, adjustable via a potentiometer. When the light level is below the threshold, the Op-Amp activates an NPN transistor to power an LED.
Open Project in Cirkit Designer| Pin Number | Name | Description |
|---|---|---|
| 1 | OUT1 | Output of Amplifier 1 |
| 2 | IN1- | Inverting Input of Amplifier 1 |
| 3 | IN1+ | Non-Inverting Input of Amplifier 1 |
| 4 | GND | Ground (0V) Reference |
| 5 | IN2+ | Non-Inverting Input of Amplifier 2 |
| 6 | IN2- | Inverting Input of Amplifier 2 |
| 7 | OUT2 | Output of Amplifier 2 |
| 8 | V+ | Positive Power Supply Voltage |
Power Supply Connection: Connect the positive power supply to pin 8 (V+) and the ground to pin 4 (GND). Ensure the supply voltage is within the specified range.
Input Signal: Apply the input signal to the non-inverting input (IN1+ or IN2+) for a non-inverted output or to the inverting input (IN1- or IN2-) for an inverted output.
Feedback Network: Connect a feedback network between the output (OUT1 or OUT2) and the inverting input (IN1- or IN2-) to set the gain of the amplifier.
Output: The amplified signal can be taken from the output pins (OUT1 or OUT2).
// Define the analog input and output pins
const int analogInPin = A0; // Analog input pin connected to the Op-Amp
const int analogOutPin = 9; // PWM output pin connected to an LED
int sensorValue = 0; // Value read from the Op-Amp
int outputValue = 0; // Value output to the PWM (LED)
void setup() {
// Initialize serial communications at 9600 bps:
Serial.begin(9600);
}
void loop() {
// Read the analog value from Op-Amp's output
sensorValue = analogRead(analogInPin);
// Map the analog value to a range suitable for PWM output
outputValue = map(sensorValue, 0, 1023, 0, 255);
// Change the analog out value
analogWrite(analogOutPin, outputValue);
// Print the results to the Serial Monitor
Serial.print("sensor = ");
Serial.print(sensorValue);
Serial.print("\t output = ");
Serial.println(outputValue);
// Wait 2 milliseconds before the next loop
delay(2);
}
Q: Can the LM358B be used with a dual power supply? A: Yes, the LM358B can operate with a dual power supply within the range of ±1.5V to ±16V.
Q: What is the difference between LM358 and LM358B? A: The LM358B is an enhanced version of the LM358 with improved specifications such as lower input offset voltage and wider temperature range.
Q: Is external compensation required for stability? A: No, the LM358B is internally compensated for unity gain stability.
Q: Can I use the LM358B for high-frequency applications? A: The LM358B has a bandwidth of 700 kHz, which may not be suitable for high-frequency applications. Consideration of the gain-bandwidth product is important for such applications.