The **JR-15-R** typically refers to a specific type of **DC Power Jack** (Electronic Connector) used widely in consumer electronics, small appliances, and DIY electronics projects. It is a female socket designed to receive power from an AC/DC adapter. Below is a detailed breakdown of its electronic components and specifications. --- ## 1. Physical Structure and Pins The JR-15-R is a panel-mount or PCB-mount component consisting of three primary terminals. | Component | Description | Function | | :--- | :--- | :--- | | **Center Pin** | The metal post in the middle of the jack. | Usually carries the **Positive (+)** voltage. | | **Shunt/Sleeve** | The outer metal ring inside the jack. | Usually carries the **Negative (-)** or Ground. | | **Switch Pin** | A third terminal that disconnects when a plug is inserted. | Used to toggle between battery and external power. | --- ## 2. Technical Specifications While specific manufacturers may vary slightly, the standard electronic ratings for a JR-15 series jack are: * **Rated Load:** DC 30V / 0.5A to 2.0A (depending on size). * **Contact Resistance:** $\le 0.03 \Omega$. * **Insulation Resistance:** $\ge 100 M\Omega$ (at DC 500V). * **Withstand Voltage:** AC 500V (50Hz) for 1 minute. * **Insertion/Extraction Force:** 3N to 20N. * **Operating Life:** 5,000 to 10,000 cycles. --- ## 3. Circuit Logic (The Switching Mechanism) One of the most important electronic features of the JR-15-R is its **internal NC (Normally Closed) switch**. ```mermaid graph LR A[External Power Plug] -- Inserts into --> B(Jack) B -- Breaks Connection --> C[Internal Battery] B -- Establishes Connection --> D[Device Main Circuit] ``` 1. **Unplugged:** The Shunt Pin and the Switch Pin are connected. If a battery is wired to the switch pin, it powers the device. 2. **Plugged In:** The barrel of the power adapter pushes the shunt spring away from the switch pin. This cuts off the battery and allows the external DC source to power the device, preventing the adapter from trying to charge a non-rechargeable battery. --- ## 4. Common Dimensions The "R" in the part number often denotes **Right-Angle** mounting or a specific **Rear-mount** nut configuration. Common sizes include: * **5.5mm x 2.1mm:** The most standard size for CCTV, LED strips, and Arduino. * **5.5mm x 2.5mm:** Used for higher-wattage devices like laptops. ---