The **KPE-16-R** is an electronic component primarily known as a **Piezoelectric Audio Indicator (Buzzer)**. It is widely used in electronics to provide audible feedback or alarm signals. --- ### 1. Technical Specifications The KPE-16-R is a self-drive buzzer, meaning it contains an internal oscillating circuit and only requires a DC voltage to operate. | Parameter | Specification (Typical) | | :--- | :--- | | **Type** | Piezoelectric Indicator | | **Rated Voltage** | 12V DC | | **Operating Voltage** | 3V to 20V DC | | **Current Consumption** | Max 10mA | | **Sound Pressure Level** | ~75dB at 30cm | | **Resonant Frequency** | 3.5 kHz ± 0.5 kHz | | **Tone Type** | Continuous | | **Mounting Type** | Through-hole (PC Pins) | --- ### 2. Key Components & Working Principle The device consists of three main internal parts: 1. **Piezoelectric Ceramic Element:** A thin disc that vibrates when an electric field is applied. 2. **Internal Oscillator:** A circuit that converts stable DC power into a specific frequency (AC-like signal) to drive the ceramic element. 3. **Plastic Housing:** Acts as a resonant chamber to amplify the sound produced by the vibration. --- ### 3. Usage & Implementation Because it has an internal driver, the implementation is very simple. Unlike a "Transducer" (which requires an external PWM signal), the "Indicator" simply needs power. #### Example Circuit Connection ```cpp // Logic for an Arduino or MCU // KPE-16-R Positive (+) to Pin 9 // KPE-16-R Negative (-) to GND void setup() { pinMode(9, OUTPUT); } void loop() { digitalWrite(9, HIGH); // Buzzer turns ON delay(1000); digitalWrite(9, LOW); // Buzzer turns OFF delay(1000); } ``` --- ### 4. Advantages and Applications * **Low Power:** Consumes very little current compared to magnetic buzzers. * **Wide Voltage Range:** Can work with various power supplies (5V, 9V, 12V). * **Applications:** * Household appliances (Microwave beeps). * Industrial equipment alarms. * Medical instrumentation. * Security systems.