The **CT-51-R** typically refers to a specific series of **Cermet Trimming Potentiometers** (variable resistors) manufactured by Nidec Components (formerly Copal Electronics). These are precision components used to adjust voltage or current within a circuit. ### 1. Key Technical Specifications The "R" suffix often denotes the orientation or terminal style (typically side-adjustment). Below are the general electronic characteristics: | Feature | Specification | | :--- | :--- | | **Element Material** | Cermet (Ceramic-Metal composite) | | **Power Rating** | 0.5 Watts at 70°C | | **Resistance Range** | 10 $\Omega$ to 2 M$\Omega$ | | **Tolerance** | ±10% | | **Temperature Coefficient** | ±100 ppm/°C | | **Adjustment Turns** | Single-turn (approx. 220° to 270° effective) | | **Mounting Type** | Through-hole (PCB) | --- ### 2. Internal Electronic Structure The CT-51-R consists of three primary internal parts that allow it to function as a voltage divider or rheostat: 1. **Cermet Track:** A resistive path made of inorganic materials fired onto a ceramic substrate. Cermet is preferred for its high stability and low environmental sensitivity. 2. **Wiper:** A metal contact that slides across the track. The position of this wiper determines the resistance between the center pin and the end pins. 3. **Terminal Pins:** * **Pins 1 & 3:** The ends of the resistive element. * **Pin 2 (Center):** Connected to the wiper. --- ### 3. Common Applications Because of its small footprint and reliability, the CT-51-R is used in various electronic assemblies: * **Calibration:** Adjusting the gain of an operational amplifier. * **Sensor Offsetting:** Setting the zero-point for sensors in industrial equipment. * **Power Supplies:** Fine-tuning the output voltage levels. * **LCD Contrast:** Controlling the bias voltage for display clarity. --- ### 4. Part Number Breakdown (Nidec/Copal) | Segment | Meaning | | :--- | :--- | | **CT-5** | Series name (8.2mm square single-turn) | | **1** | Terminal spacing / Configuration style | | **R** | Adjustment direction (Side adjustment / Right angle) | ---