LM358 – Dual Low‑Power Operational Amplifier (DIP‑8)

⚙️ LM358 – Dual Low‑Power Operational Amplifier (DIP‑8)

The LM358 is a versatile dual op‑amp featuring wide-range supply operation, low power consumption, and a common-mode input that includes ground, making it ideal for battery-powered systems, sensor amplification, active filters, and interfacing with microcontrollers.

📊 Key Specifications

🔌 Wiring Example: Non‑Inverting Amplifier with Arduino

Circuit Diagram:

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   +VCC (e.g., +12 V)
      └── Pin 8 (VCC)
LM358:
 Pin 3 (IN+) ← Signal (e.g., sensor or micro)
 Rf      → Pin 1 (OUT)
 Rg      → Pin 2 (IN−)
        └── Pin 4 (GND)

Output (Pin 1) → Voltage divider → Arduino A0 (0–5 V input)

Sample Arduino Sketch:

cpp
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const int sensorIn = A0;
void setup(){
  Serial.begin(9600);
}
void loop(){
  int raw = analogRead(sensorIn);
  float volt = raw * (5.0 / 1023.0);
  Serial.println(volt);
  delay(200);
}

Use this setup to amplify small sensor signals like temperature or photoresistors for clearer Arduino reading.

🧩 Typical Applications

• Sensor front-ends (temperature, light, pH)

• Active low-pass/high-pass filters and integrators

• Voltage follower and buffer stages

• Signal summing and differential measurement

• Battery-powered instrumentation

▶️ YouTube Tutorials (copy links)

• Intro to LM358 – Basic Circuit Applications
  https://www.youtube.com/watch?v=7FYHt5XviKc makerhero.com+4eelectronicparts.com+4powermavelectronics.com+4sg-micro.comen.wikipedia.org+1tubesandmore.com+1ersaelectronics.comebay.com+14forum.allaboutcircuits.com+14mouser.com+14

• Arduino + LM358: Signal Amplifier Projects
  https://www.youtube.com/watch?v=4DrT7xwifB0 eelectronicparts.com

📄 Official Datasheet

Download the full technical datasheet (Onsemi / TI) covering pinout, electrical characteristics, graphs, and application circuits:

LM358 Datasheet PDF