The **W2AP-D1G-R** is a specialized electronic component primarily categorized as an **Electromagnetic Buzzer** (or Magnetic Transducer). These components are designed to convert electrical signals into audible sound waves using electromagnetic induction. --- ### 1. Key Technical Specifications The following table highlights the typical electronic characteristics of the W2AP series (specifically the 1V to 1.5V D1G variant): | Parameter | Specification | | :--- | :--- | | **Rated Voltage** | 1.5V DC | | **Operating Voltage** | 1.0V ~ 1.7V DC | | **Rated Current** | Max 80mA | | **Sound Pressure Level (SPL)** | Min 85dB (at 10cm) | | **Resonant Frequency** | 2,300Hz ± 300Hz | | **Operating Temperature** | -20°C to +70°C | | **Mounting Type** | Through-hole (Pins) | --- ### 2. Internal Components & Construction The "W2AP" series typically consists of four main electronic/mechanical parts: 1. **Electromagnet (Coil):** A copper wire coil wrapped around a soft iron core. When current flows, it creates a magnetic field. 2. **Permanent Magnet:** Provides a static magnetic field that interacts with the coil's field. 3. **Vibrating Diaphragm:** A thin metal disk (often containing a small iron piece) that is pulled and released rapidly by the magnetic forces. 4. **Housing (Resonator):** A plastic casing designed to amplify the sound at the resonant frequency. --- ### 3. Circuit Integration Unlike "active" buzzers that have internal oscillating circuits, this model is usually a **passive transducer**. * **Driving Signal:** It requires an external square wave signal at its resonant frequency (approx. 2.3kHz) to produce sound. * **Protection:** Because it is an inductive load (a coil), it is highly recommended to place a **flyback diode** in parallel with the buzzer to prevent voltage spikes from damaging the driving transistor or MCU. ```cpp // Example: Basic Arduino code to drive a 2.3kHz Buzzer int buzzerPin = 9; void setup() { pinMode(buzzerPin, OUTPUT); } void loop() { tone(buzzerPin, 2300); // Send 2.3kHz square wave delay(500); noTone(buzzerPin); // Stop sound delay(500); } ``` --- ### 4. Applications The W2AP-D1G-R is commonly found in: * **Household Appliances:** Microwave beepers or washing machine alerts. * **Industrial Equipment:** Control panel status indicators. * **Handheld Devices:** Battery-operated testers requiring low-voltage sound components.