The **DTDK-R** is a specific series of miniature, high-frequency electromagnetic relays, commonly manufactured by companies like **Daitron** or **STK**. These components are primarily designed for signal switching in telecommunications, testing equipment, and industrial automation. ### 1. Technical Specifications Overview Below are the typical electronic characteristics of a DTDK-R series relay: | Feature | Specification (Typical) | | :--- | :--- | | **Contact Form** | 2 Form C (DPDT - Double Pole Double Throw) | | **Contact Material** | Gold-clad silver alloy | | **Coil Voltage Options** | 5V, 12V, 24V DC | | **Switching Capacity** | 1A to 2A at 30V DC / 125V AC | | **Max Switching Power** | 30W (DC) / 62.5VA (AC) | | **Mounting Type** | Through-hole PCB | --- ### 2. Key Internal Components The DTDK-R functions based on standard electromagnetic induction but is miniaturized for precision electronics: * **The Coil:** A copper winding that creates a magnetic field when energized. In the "R" variant, this is often optimized for low power consumption (high sensitivity). * **The Armature:** A moving metallic part that reacts to the magnetic field. * **Contacts:** The DTDK-R uses **Gold-Clad** contacts. Gold is used because it prevents oxidation, ensuring low contact resistance even when switching very small currents (low-level signals). * **Spring Mechanism:** Returns the armature to its original position once the power to the coil is cut. --- ### 3. Applications and Use Cases Due to its small footprint and reliability, the DTDK-R is found in: 1. **Telecommunications:** Used for line switching and signal routing. 2. **Medical Equipment:** Small-scale switching in diagnostic tools. 3. **Measurement Devices:** Oscilloscopes and multimeters often use these relays to switch between different measurement ranges. 4. **Security Systems:** Control circuits for alarms and sensors. --- ### 4. Circuit Diagram Representation In a schematic, the DTDK-R is represented by a coil and two sets of switches: ```text Coil Pins Switch 1 (DPDT) Switch 2 (DPDT) [+] / (NC) / (NC) ( )----------(COM)--- (COM)--- [-] \ (NO) \ (NO) ```