The **MA78FCX-R** is a specialized precision potentiometer, commonly used in industrial and aerospace applications where high-reliability angular position sensing is required. It is manufactured by **Marushin Electric** (or associated precision component brands). --- ## 1. Technical Specifications The following table outlines the typical characteristics of the MA78FCX-R series: | Parameter | Typical Value | | :--- | :--- | | **Component Type** | Single-turn Precision Potentiometer | | **Resistance Range** | 1kΩ to 10kΩ (model dependent) | | **Linearity** | ±0.5% to ±1.0% | | **Rotation Angle** | 360° Continuous (Mechanical) | | **Effective Electrical Angle** | ~340° to 350° | | **Power Rating** | 0.5W to 1.0W at 40°C | | **Operating Temperature** | -55°C to +105°C | | **Mounting Style** | Bushing Mount / Panel Mount | --- ## 2. Key Internal Components The "Electronic Parts" within this device are designed for low noise and longevity: 1. **Conductive Plastic Element:** Unlike wire-wound types, the "FCX" series often utilizes a conductive plastic track. This provides essentially infinite resolution and a longer operational life (millions of cycles). 2. **Precious Metal Wiper:** The internal contact (wiper) is typically made of a multi-finger gold or silver alloy to minimize contact resistance and electrical noise (output smoothness). 3. **Stainless Steel Shaft:** Designed for high mechanical durability and resistance to corrosion. 4. **Ball Bearings:** High-end versions include miniature ball bearings to reduce torque and increase rotational precision. --- ## 3. Terminal Configuration The device typically features three terminals, functioning as a standard voltage divider: ```json { "Terminal 1": "Input / High End", "Terminal 2": "Wiper (Output signal)", "Terminal 3": "Ground / Low End" } ``` --- ## 4. Common Applications * **Servo Systems:** Used as a feedback sensor to determine the position of a motor shaft. * **Industrial Joysticks:** Providing precise X-Y axis analog input. * **Medical Equipment:** For adjusting sensitive parameters in diagnostic machinery. * **Aviation:** Flap or throttle position sensing where environmental resilience is required.