The **K-846-R** is an electronic component primarily recognized as an **Electromagnetic Passive Buzzer** or **Transducer**. These components are widely used in consumer electronics, automotive alerts, and industrial equipment to provide audible feedback. --- ### 1. Key Technical Specifications The following table outlines the typical electronic characteristics of a K-846-R style electromagnetic transducer: | Parameter | Typical Value | Unit | | :--- | :--- | :--- | | **Rated Voltage** | 1.5 - 12 | Vp-p | | **Operating Voltage** | 1.0 - 30 | Vp-p | | **Rated Current** | Max 2 - 5 | mA | | **Sound Pressure Level (SPL)** | 80 - 85 (at 10cm) | dB | | **Resonant Frequency** | 2048 / 2400 | Hz | | **Operating Temperature** | -20 to +70 | °C | | **Mounting Type** | Through-hole (Radial) | - | --- ### 2. Functional Description Unlike active buzzers, the K-846-R is a **passive** component. This means it does not have an internal oscillation circuit. * **Driving Method:** It requires an external square wave signal (PWM) to produce sound. The frequency of the input signal determines the pitch of the tone. * **Mechanism:** It consists of a coil of wire and a permanent magnet. When an alternating current passes through the coil, it creates a fluctuating magnetic field that moves a metallic diaphragm, creating sound waves. --- ### 3. Application Circuitry To interface a K-846-R with a microcontroller (like an Arduino or STM32), a simple transistor driver circuit is recommended because the current draw may exceed the GPIO pin limits. #### Example Connection Diagram ```text [MCU GPIO] ---- [Resistor] ---- [Base of NPN Transistor] | [Collector] ---- [K-846-R (-)] | [VCC (+)] | [Emitter] ---- [GND] ``` --- ### 4. Common Use Cases 1. **User Interface:** Beeps for button presses on household appliances (microwaves, washing machines). 2. **Alarms:** Low-battery warnings or error notifications in handheld devices. 3. **Timers:** Audible alerts for countdown completion.