The **PVC62** (often associated with the Bourns PVC62 series) refers to a specific type of **Single-Turn Cermet Trimmer Potentiometer**. These components are precision electronic parts used to adjust voltage or current within a circuit. --- ### 1. Key Technical Specifications The PVC62 series is characterized by its small footprint (6mm square) and high reliability. | Feature | Description | | :--- | :--- | | **Element Type** | Cermet (Ceramic/Metal composite) | | **Adjustment Angle** | 210° (Mechanical), 180° (Electrical) | | **Power Rating** | 0.5 Watts at 70°C | | **Resistance Range** | 10 Ohms to 2 Megohms | | **Tolerance** | ±10% or ±20% | | **Mounting Type** | Through-hole (Top or Side adjust) | --- ### 2. Internal Construction To understand the electronic function, it is helpful to look at the internal anatomy: 1. **Resistive Element:** A thick-film cermet paste fired onto a ceramic substrate. Cermet is preferred because it offers better stability and lower temperature coefficients than carbon. 2. **Wiper:** A metal contact that slides across the resistive element. Its position determines the resistance value between the center pin and the outer pins. 3. **Housing:** Usually made of UL94V-0 rated plastic to provide flame retardancy and insulation. --- ### 3. Electronic Functions and Use Cases The PVC62 serves three primary roles in an electronic circuit: * **Voltage Divider:** By connecting the two outer pins to a voltage source and ground, the center pin (wiper) provides a variable output voltage. * **Variable Resistor (Rheostat):** By using the center pin and only one outer pin, it acts as a variable resistor to control current flow (e.g., LED brightness). * **Calibration:** It is frequently used for "Set and Forget" applications where a circuit must be calibrated during manufacturing (e.g., setting the gain on an operational amplifier). --- ### 4. Circuit Symbol and Pinout In a schematic, the PVC62 is represented by a standard potentiometer symbol. ```text (1) ----[ R ]---- (3) | (2) <-- Wiper (Adjustable) ``` * **Pin 1 & 3:** The fixed ends of the resistor. * **Pin 2:** The adjustable output. ---