The term **"084"** in electronics most commonly refers to the **TL084**, a widely used integrated circuit (IC). It is a high-speed, quad JFET-input operational amplifier (Op-Amp). --- ## 1. Overview of the TL084 The TL084 contains four independent operational amplifiers in a single package. Because it uses Junction Field-Effect Transistors (JFET) at the input stage, it offers very high input impedance and low bias current compared to standard Bipolar Junction Transistor (BJT) op-amps like the LM324. ### Technical Specifications | Feature | Typical Value | | :--- | :--- | | **Number of Channels** | 4 (Quad) | | **Input Type** | JFET (High Impedance) | | **Supply Voltage** | ±7V to ±18V (Dual) or up to 36V (Single) | | **Slew Rate** | 13 V/µs (Fast response) | | **Gain Bandwidth** | 3 MHz | | **Input Bias Current** | 30 pA (Very low) | --- ## 2. Pinout Configuration The TL084 typically comes in a **DIP-14** or **SOIC-14** package. Each of the four op-amps shares the power supply pins. | Pin Number | Function | Description | | :--- | :--- | :--- | | 1, 7, 8, 14 | **Output** | Output signal for Op-Amps 1, 2, 3, and 4 | | 2, 6, 9, 13 | **Inverting Input (-)** | Negative input for the respective Op-Amp | | 3, 5, 10, 12 | **Non-Inverting Input (+)** | Positive input for the respective Op-Amp | | 4 | **Vcc+** | Positive Supply Voltage | | 11 | **Vee- / GND** | Negative Supply Voltage (or Ground) | --- ## 3. Key Advantages 1. **Low Harmonic Distortion:** Ideal for high-fidelity audio applications. 2. **High Slew Rate:** Can handle rapidly changing signals without significant distortion. 3. **Internal Frequency Compensation:** Simplifies circuit design as it doesn't require external capacitors for stability. 4. **Low Power Consumption:** Efficient for battery-operated pre-amps. --- ## 4. Common Applications * **Audio Mixers:** Used for summing signals and pre-amplification. * **Active Filters:** High-pass, low-pass, and band-pass filters in signal processing. * **Buffer Circuits:** Using the high input impedance to prevent signal loading between stages. * **Sample and Hold Circuits:** Due to the low input bias current. ---