The **CT-5E-R** is a specific electronic component, typically identified as a **multi-turn cermet trimmer potentiometer** manufactured by **Nidec Components** (formerly Copal Electronics). It is widely used in electronic circuits for precise voltage or current adjustments. --- ### ## Technical Specifications The "CT-5" series represents a specific form factor and construction style. Here are the core electronic characteristics: | Parameter | Typical Specification | | :--- | :--- | | **Type** | Multi-turn (approx. 11 turns) | | **Resistance Element** | Cermet (Ceramic-Metal composite) | | **Adjustment Direction** | Top adjustment | | **Power Rating** | 0.25 Watts (at 70°C) | | **Resistance Tolerance** | ±10% | | **Temperature Coefficient** | ±100 ppm/°C | | **Operating Temp Range** | -55°C to +125°C | --- ### ### Key Electronic Features 1. **Multi-turn Precision:** Unlike single-turn potentiometers, the CT-5E-R requires roughly **11 turns** of the adjustment screw to travel the full resistance range. This allows for extremely fine-tuning of parameters. 2. **Cermet Material:** The use of Cermet provides high stability and low noise compared to carbon film resistors. It is also resistant to environmental factors like humidity. 3. **Wiper Protection:** The "R" suffix often denotes the packaging style (such as Tape and Reel or specific lead forming), but the internal mechanism includes a "clutch" or "stop" to prevent mechanical damage if the screw is turned past the electrical limits. 4. **Sealed Construction:** The housing is typically sealed (IP67 equivalent), meaning it can withstand board washing processes after soldering without the internal resistance element being contaminated. --- ### ### Pinout and Circuit Symbol The device features three terminals. Internally, it functions as a variable voltage divider or a rheostat. ```text (2) Wiper | [### ### ###] <-- Resistance Element | | (1) (3) ``` * **Terminal 1 & 3:** Fixed ends of the resistor. * **Terminal 2:** The "Wiper" which moves along the track as you turn the screw. --- ### ### Common Applications * **Operational Amplifier Offsets:** Nulling out DC offset voltages. * **Power Supplies:** Fine-tuning output voltage levels (e.g., setting a rail exactly to 3.3V). * **Sensor Calibration:** Adjusting the gain or zero-point of an analog sensor signal. * **Timing Circuits:** Adjusting RC time constants in oscillators.