It appears you are referring to the **YN-R** series of components, which is a specific naming convention often used by manufacturers like **Yageo** (for resistors) or in the context of **RC Servo control boards** and **power relays**. The term most commonly refers to **Surface Mount Device (SMD) Resistors** or **Electronic Relay Modules**. Below is a breakdown of the parts associated with these electronic components. --- ### 1. YN-R as SMD Resistors (Yageo/General) In the context of passive components, "YN" often denotes a series (like Non-inductive or specific tolerance types), and "R" stands for **Resistance**. | Feature | Description | | :--- | :--- | | **Material** | Thick film or Thin film resistive element on a ceramic substrate. | | **Terminations** | Lead-free tin (Sn) over nickel (Ni) barrier. | | **Marking** | Usually a 3 or 4-digit code (e.g., 103 = 10kΩ). | | **Function** | Current limiting, voltage division, and pull-up/down circuits. | ### 2. YN-R as Power Relays (Electromechanical) If the part is a larger rectangular block (often labeled **YN-R-112D** or similar), it is an electromechanical relay used for switching high-power loads with low-power signals. #### Key Internal Parts: * **The Coil:** A copper winding that creates a magnetic field when energized. * **The Armature:** The moving part that responds to the magnetic field. * **Spring:** Returns the armature to the original position when power is removed. * **Contacts:** Usually made of silver alloy to prevent welding; categorized as **NO** (Normally Open) and **NC** (Normally Closed). ### 3. YN-R Servo/Control Boards In hobbyist electronics, YN-R can refer to specific **Radio Control (RC)** receiver components. #### Electronic Components on Board: 1. **Microcontroller (MCU):** Processes the PWM (Pulse Width Modulation) signal. 2. **H-Bridge (MOSFETs):** Controls the direction and speed of a motor. 3. **Potentiometer:** Provides feedback on the position of the gears. 4. **Voltage Regulator:** Ensures the logic circuit receives a steady 3.3V or 5V. --- ### Summary Table: Component Specifications | Component Type | Common Voltage/Value | Common Application | | :--- | :--- | :--- | | **Resistor (SMD)** | 0Ω to 10MΩ | Signal conditioning | | **Relay (112D)** | 12V DC Coil / 10A Load | Home automation / Industrial | | **Servo Board** | 4.8V - 6.0V | Robotics / RC Vehicles | ---