How to Use TL072CP: Examples, Pinouts, and Specs

The TL072CP, manufactured by Otronic (Part ID: op-amp), is a low-noise JFET-input operational amplifier designed for high-speed and low-distortion applications. This dual op-amp is widely used in audio systems, signal processing, and instrumentation circuits due to its excellent performance characteristics, including low input bias current and high slew rate.

• Audio preamplifiers and equalizers
• Active filters and oscillators
• Signal conditioning and processing
• Instrumentation amplifiers
• Analog computing and integration circuits

The TL072CP is a versatile operational amplifier with the following key specifications:

The TL072CP is available in an 8-pin Dual In-line Package (DIP-8). The pinout and descriptions are as follows:

1. Power Supply: Connect the V+ pin (Pin 8) to the positive supply voltage and the V- pin (Pin 4) to the negative supply voltage or ground. Ensure the supply voltage is within the range of ±3V to ±18V.
2. Input Connections: Connect the input signal to the non-inverting (Pin 3 or Pin 5) or inverting input (Pin 2 or Pin 6), depending on the desired configuration (e.g., inverting or non-inverting amplifier).
3. Output: The amplified signal will be available at the corresponding output pin (Pin 1 or Pin 7).
4. Feedback Network: Use resistors and/or capacitors in the feedback loop to set the gain and frequency response of the amplifier.
5. Bypass Capacitors: Place decoupling capacitors (e.g., 0.1µF) close to the power supply pins to reduce noise and improve stability.

Below is an example of using the TL072CP as a non-inverting amplifier with an Arduino UNO:

• Connect the input signal to Pin 3 (Non-Inverting Input A).
• Connect a feedback resistor (Rf) between Pin 1 (Output A) and Pin 2 (Inverting Input A).
• Connect a resistor (Rin) between Pin 2 and ground.
• The gain of the amplifier is determined by the formula: Gain = 1 + (Rf / Rin).

// Example: Reading an amplified signal from the TL072CP with Arduino UNO
// The amplified signal is connected to Arduino's analog pin A0.

const int analogPin = A0; // Define the analog input pin
int sensorValue = 0;      // Variable to store the analog reading

void setup() {
  Serial.begin(9600); // Initialize serial communication at 9600 baud
}

void loop() {
  sensorValue = analogRead(analogPin); // Read the amplified signal
  float voltage = sensorValue * (5.0 / 1023.0); // Convert to voltage
  Serial.print("Amplified Voltage: ");
  Serial.println(voltage); // Print the voltage to the Serial Monitor
  delay(500); // Wait for 500ms before the next reading
}

• Input Impedance: The high input impedance of the TL072CP makes it suitable for interfacing with high-impedance sources.
• Power Supply Decoupling: Always use bypass capacitors (e.g., 0.1µF ceramic and 10µF electrolytic) near the power supply pins to minimize noise.
• Thermal Considerations: Ensure proper ventilation or heat dissipation if the device operates in high-temperature environments.

1. No Output Signal:

   • Verify the power supply connections (V+ and V-).
   • Check the input signal and ensure it is within the specified voltage range.
   • Inspect the feedback network for proper resistor and capacitor values.

2. Distorted Output:

   • Ensure the input signal amplitude does not exceed the input voltage range.
   • Check for proper decoupling capacitors to reduce noise and distortion.

3. High Noise Levels:

   • Use shielded cables for input signals.
   • Place bypass capacitors close to the power supply pins.

4. Overheating:

   • Verify that the supply voltage is within the specified range (±3V to ±18V).
   • Ensure the load connected to the output does not exceed the current rating.

Q1: Can the TL072CP be used for single-supply operation?
A1: Yes, the TL072CP can operate with a single supply voltage. Connect V- to ground and ensure the input and output signals are biased appropriately.

Q2: What is the maximum gain achievable with the TL072CP?
A2: The maximum gain depends on the feedback network. However, for stability, it is recommended to keep the gain within practical limits (e.g., below 1000).

Q3: Is the TL072CP suitable for audio applications?
A3: Yes, the TL072CP is ideal for audio applications due to its low noise, low distortion, and high slew rate.

Q4: Can I use the TL072CP with an Arduino?
A4: Yes, the TL072CP can be used to amplify analog signals for Arduino's ADC inputs. Ensure the output voltage is within the Arduino's input range (0-5V for most models).