### KEPA-13P2-R: Electronic Specifications and Overview The **KEPA-13P2-R** is a specific model of a **Piezoelectric Transducer (Buzzer)**. These components are used to convert electrical signals into audible sound through the use of a piezoelectric ceramic element. --- ### Technical Specifications | Parameter | Specification (Typical) | | :--- | :--- | | **Type** | External Drive Piezo Transducer | | **Resonant Frequency** | 2.5 kHz ~ 4.5 kHz (Approx.) | | **Operating Voltage** | 1V to 30V p-p (Square Wave) | | **Sound Pressure Level (SPL)** | ≥ 80dB at 10cm | | **Capacitance** | 15,000 pF ± 30% | | **Operating Temperature** | -20°C to +70°C | | **Mounting Type** | Through-hole (Pins) | --- ### Component Features 1. **Piezoelectric Element:** Unlike electromagnetic buzzers, this uses a ceramic disk that vibrates when an AC voltage is applied. 2. **External Drive:** The "P2" designation typically implies it requires an external oscillating circuit (square wave) to produce sound. It does not have a built-in internal oscillator. 3. **Polarity:** Generally, these devices are non-polarized, though specific pin markings should be checked on the datasheet for phase-sensitive applications. 4. **Low Current Consumption:** Piezo transducers are highly efficient and consume significantly less power than magnetic buzzers, making them ideal for battery-operated devices. --- ### Basic Driving Circuit To operate the KEPA-13P2-R, you must provide a frequency-matched signal. Below is a simple example using an MCU (like Arduino): ```cpp // Simple Arduino code to drive the Piezo int piezoPin = 9; // Connect to digital pin 9 void setup() { pinMode(piezoPin, OUTPUT); } void loop() { tone(piezoPin, 4000); // Send a 4kHz signal delay(1000); // Wait 1 second noTone(piezoPin); // Stop sound delay(1000); } ``` --- ### Applications * **Alarms:** Smoke detectors, security systems. * **Feedback:** Keypad "beeps" on microwave ovens or calculators. * **Indicators:** Low battery warnings in handheld devices. * **Medical Equipment:** Heart rate monitors and alert systems.