Active Piezo Buzzers for Electronic Equipment and OEM Applications
MANORSHI is an active piezo buzzer manufacturer and supplier offering self-driven piezoelectric sound indicators for electronic equipment, alarm systems, home appliances and industrial control devices. Our active piezo buzzer range includes compact and high-output models with different rated voltages, sound pressure levels, resonant frequencies and installation configurations.
An active piezo buzzer features a built-in oscillation circuit that generates an audible tone when DC power is applied. Unlike passive piezoelectric sounders, which require an external AC or pulse signal, active piezo buzzers simplify circuit design by integrating the sound-generating drive circuit into the component.
MANORSHI supplies active piezo buzzers with rated voltages including 5V, 12V and 24V DC, as well as selected high-voltage DC models. Available products cover compact dimensions, approximately 2.8–4.0kHz resonant frequencies and sound pressure levels of approximately 85–105dB, depending on the model and measurement conditions.
These piezoelectric indicators are suitable for electronic equipment manufacturers, security system developers, home appliance manufacturers, industrial control equipment suppliers and electronic component distributors looking for reliable audible warning components.
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What Is an Active Piezo Buzzer?
An active piezo buzzer, also called a self-driven piezo buzzer or internally driven piezoelectric indicator, is an audible signaling component with a built-in electronic oscillation circuit. It converts electrical energy into sound through the vibration of a piezoelectric ceramic element.
When the correct DC voltage is applied, the internal oscillator generates an alternating electrical signal that drives the piezoelectric element. The element vibrates at its designed operating frequency and produces an audible tone through the resonant housing.
The main components of an active piezo buzzer typically include:
Piezoelectric Ceramic Element: Converts electrical signals into mechanical vibration.
Oscillation Circuit: Generates the electrical signal required to drive the piezoelectric element.
Resonant Housing: Supports acoustic resonance and sound radiation.
Electrical Terminals: Connect the buzzer to the DC power supply.
Because the oscillation circuit is integrated into the component, an active piezo buzzer can generate its specified tone without requiring an external frequency generator. This makes it convenient for warning indicators, alarm circuits and electronic products requiring a simple audible signal.
Active Piezo Buzzer vs. Passive Piezo Buzzer
Active and passive piezo buzzers use piezoelectric elements to generate sound, but they differ in their internal circuit structure and driving requirements. Selecting the correct type depends on whether the application requires a simple fixed-tone warning or externally controlled sound generation.
| Comparison | Active Piezo Buzzer | Passive Piezo Buzzer |
| Oscillation Circuit | Built-in oscillator | No built-in oscillator |
| Input Signal | DC power supply | External AC or pulse signal |
| Sound Generation | Generates a preset tone when powered | Generates sound according to the external driving signal |
| Frequency Control | Generally fixed by the internal oscillator | Controlled by the external driving circuit |
| Circuit Design | Simpler driving circuit | Requires an external signal generator or controller |
| Typical Applications | Alarms, warning indicators and home appliances | Electronic devices requiring variable tones or frequency control |
Choose an active piezo buzzer when the application requires a simple audible warning triggered by a DC power supply. Choose a passive piezo buzzer when the electronic system needs to control the sound frequency or generate different tones through an external drive circuit.
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MANORSHI Active Piezo Buzzer Product Range
MANORSHI offers active piezo buzzers in different dimensions and electrical configurations for electronic equipment manufacturers and industrial applications. The current product range includes compact models, medium-size indicators and larger high-output piezo buzzers.
Available product groups are organized according to size, including 0–20mm, 21–29mm, 30–39mm, 40–49mm and 50mm or larger categories. Product dimensions, mounting methods and acoustic characteristics vary by model.
| Product Model | Dimensions | Rated Voltage | Frequency | SPL |
| MSPS14A40P7.6V12 | 13.8 × 7.5mm | 12VDC | 4000 ± 500Hz | ≥85dB @ 10cm |
| MSPS22A37W150V5 | 22 × 10.7mm | 5VDC | 4000 ± 500Hz | ≥90dB @ 10cm |
| MSPS23A35P15V12 | 23 × 10mm | 12VDC | 3500 ± 500Hz | ≥90dB @ 10cm |
| MSPS23B33W100V12 | 22.5 × 12mm | 12VDC | 3300 ± 500Hz | ≥95dB @ 10cm |
| MSPS40C30W100V12 | 40 × 20mm | 12VDC | 3000 ± 500Hz | ≥105dB @ 10cm |
| MSPS42A28W150V12CT | 41.8 × 16mm | 12VDC | 2800 ± 500Hz | ≥105dB @ 10cm |
| MSPS45A29V12 | 45 × 26mm | 12VDC | 2900 ± 500Hz | ≥100dB @ 10cm |
The table shows selected representative models from the product range. Other models are available with different voltage ratings, dimensions, frequencies and sound output characteristics. Please consult the individual product datasheet for the exact specifications of each model.
Some products are specified with sound pressure measurements at 30cm rather than 10cm. SPL values measured at different distances should not be directly compared without considering the test conditions.
Active Piezo Buzzers by Voltage and Size
5V Active Piezo Buzzers
5V active piezo buzzers are suitable for low-voltage electronic equipment, embedded control systems, compact alarm circuits and battery-powered devices designed around a 5V supply. The MSPS22A37W150V5 is one example, with a 5VDC rated voltage, 4000 ± 500Hz frequency and sound pressure of at least 90dB at 10cm.
12V Active Piezo Buzzers
12V active piezo buzzers are commonly used in alarm equipment, home appliances, security systems, automotive electronics and industrial control devices. MANORSHI offers different 12V models with various dimensions, resonant frequencies, sound pressure levels and current consumption characteristics.
Available options include compact 13.8mm models, approximately 22–24mm products, and larger 30–45mm buzzer designs. Depending on the model, sound pressure specifications range from approximately 85dB to 105dB under the stated test conditions.
24V Active Piezo Buzzers
24V active piezo buzzers are suitable for selected industrial control panels, machinery warning devices and equipment using 24V DC control power. The MSPS30H35W100V24CT is one example of a 24VDC rated piezo buzzer, with a specified sound pressure level of at least 95dB at 30cm.
High-Voltage DC Active Piezo Buzzers
MANORSHI also lists a specialized high-voltage DC piezo buzzer, model MSPS43A28P33V220FPT, with a rated voltage of 220VDC and a specified operating voltage range of 60–250VDC.
This model is intended for equipment designed with the corresponding high-voltage DC supply. It must not be treated as a standard 220VAC buzzer. Engineers should verify the official electrical specifications, insulation requirements and circuit protection before integration.
Applications of Active Piezo Buzzers
Active piezo buzzers provide audible alerts in electronic products and equipment requiring a simple sound indication. Their built-in oscillation circuits make them suitable for applications where a fixed warning tone is sufficient.
Home Appliances
Active piezo buzzers are used in washing machines, refrigerators, microwave ovens, air conditioners, kitchen appliances and other household electronic products. They provide operating confirmation sounds, timer alerts, error notifications and warning signals.
Security and Alarm Systems
Security equipment manufacturers use active piezo buzzers in intrusion alarms, access control systems, electronic locks, smoke alarm devices and other warning equipment. A fixed audible tone can indicate an alarm condition, system status or user operation.
Industrial Control Equipment
Industrial control panels, instrumentation equipment and automated machinery use piezo buzzers to provide operating feedback and fault warnings. Different voltage and sound output options allow equipment developers to select suitable components for their control circuits.
Automotive Electronics
Active piezo buzzers can be integrated into automotive electronic equipment, parking assistance devices, warning indicators and vehicle control systems. Selection should consider supply voltage, operating temperature, sound output and installation conditions.
Printers, Copiers and Office Equipment
Printers, photocopiers, scanners and other office equipment use small audible indicators to notify users of completed operations, paper shortages, operating errors and maintenance requirements.
Electronic Toys and Consumer Devices
Compact active piezo buzzers are used in electronic toys, timers, small appliances and consumer electronic devices requiring simple sound feedback. Small dimensions and low current consumption are important selection considerations for these applications.
How to Choose the Right Active Piezo Buzzer
Selecting the correct active piezo buzzer requires evaluating its electrical, acoustic and mechanical specifications together. A buzzer should match the power supply, required sound output, installation space and operating environment of the final equipment.
1. Rated Voltage and Operating Voltage
Rated voltage is the nominal supply voltage used for specifying the buzzer's electrical and acoustic performance. Operating voltage indicates the permitted supply voltage range for the selected model.
MANORSHI offers different voltage configurations, including 5VDC, 12VDC and 24VDC models, together with selected high-voltage DC products. The rated voltage and operating voltage must be checked separately to avoid incorrect power supply selection.
2. Sound Pressure Level (SPL)
Sound pressure level measures the acoustic output of the buzzer and is expressed in decibels (dB). MANORSHI active piezo buzzer models offer different sound output levels, with representative products ranging from approximately 85dB to 105dB.
When comparing products, always check the measurement distance, supply voltage, measurement environment and acoustic test conditions. For example, 90dB measured at 10cm cannot be directly compared with 90dB measured at 30cm.
3. Resonant Frequency
Resonant frequency is the frequency at which the buzzer is designed to produce its specified acoustic response. MANORSHI active piezo buzzer models commonly operate around 2.8–4.0kHz, depending on the model.
The selected frequency should match the required audible warning characteristics and the equipment's acoustic design requirements.
4. Current Consumption
Current consumption determines the electrical load imposed on the power supply and control circuit. Different active piezo buzzers have different current requirements according to their size, drive circuit and acoustic output.
The published MANORSHI product listings include models with current specifications ranging from approximately 7mA to 50mA. Always use the maximum current specification of the selected model when designing the power supply and switching circuit.
5. Dimensions and Installation
The buzzer's diameter, height, terminal position and mounting configuration must match the available installation space. MANORSHI provides different sizes, including compact PCB-mounted designs and larger wired piezo buzzers.
Customers should check the appearance drawing and terminal dimensions before completing the PCB layout or mechanical enclosure design.
6. Continuous Tone or Pulse Tone
Some active piezo buzzers generate a continuous single tone, while selected models are designed for intermittent or pulse sound patterns. The required audible signal should be confirmed according to the alarm or equipment control strategy.
7. Operating Temperature and Environmental Conditions
Operating temperature, humidity, dust exposure and mechanical installation conditions can affect the suitability of a buzzer for the final product. Check the model's environmental specifications and do not assume that a standard open-housing piezo buzzer is waterproof or suitable for outdoor exposure.
OEM Active Piezo Buzzer Manufacturing and Supply
MANORSHI supplies active piezo buzzers for OEM equipment manufacturers, electronic component distributors, alarm system developers and industrial product companies.
For OEM projects, the selected buzzer should be evaluated according to the electrical supply, sound pressure requirement, installation dimensions, sound pattern and environmental conditions of the finished equipment.
Important information for product selection and quotation includes:
Required rated voltage and operating voltage range.
Required sound pressure level and measurement distance.
Resonant frequency and sound pattern.
Maximum current consumption.
Buzzer dimensions and mounting method.
Wire length, terminal configuration and PCB requirements.
Operating temperature and environmental conditions.
Sample quantity and estimated annual purchase volume.
Customers can request product samples for electrical and acoustic evaluation before volume production. Sample availability, minimum order quantity, production lead time and customization feasibility depend on the selected model and project requirements.
For customized projects, please provide your product drawings, electrical specifications or reference samples. Our team can evaluate suitable active piezo buzzer models for your application.
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Frequently Asked Questions About Active Piezo Buzzers
1. What Is an Active Piezo Buzzer?
An active piezo buzzer is an electronic sound indicator with a built-in oscillation circuit. When the correct DC voltage is applied, the internal circuit drives the piezoelectric element to generate a preset audible tone. It does not require an external frequency generator.
2. How Does an Active Piezo Buzzer Work?
An active piezo buzzer contains a piezoelectric ceramic element and an internal oscillator. Applying the specified DC voltage activates the oscillator, which generates an alternating signal to drive the ceramic element. The resulting vibration produces an audible sound.
3. What Is the Difference Between Active and Passive Piezo Buzzers?
An active piezo buzzer has a built-in oscillation circuit and produces sound when supplied with DC power. A passive piezo buzzer has no built-in oscillator and requires an external AC or pulse signal. Active types are convenient for fixed-tone alarms, while passive types provide greater control over sound frequency.
4. Can an Active Piezo Buzzer Work with DC Power Only?
Yes. An active piezo buzzer is designed to generate sound when the specified DC voltage is applied. Its built-in oscillation circuit generates the electrical signal needed to drive the piezoelectric element. The supply voltage must remain within the operating range specified for the selected model.
5. Does an Active Piezo Buzzer Need an External Oscillator?
No. An active piezo buzzer already includes an internal oscillation circuit. The external control system generally only needs to switch the DC power supply on or off to activate or stop the sound. A passive piezo sounder, by comparison, requires an external driving signal.
6. What Voltage Options Are Available for MANORSHI Active Piezo Buzzers?
MANORSHI offers active piezo buzzer models with different rated voltages, including 5VDC, 12VDC and 24VDC. A specialized 220VDC model is also listed. The rated voltage and operating voltage range should always be confirmed in the individual product datasheet before ordering.
7. What Is the Typical Sound Pressure Level of an Active Piezo Buzzer?
The sound pressure level depends on the buzzer model, rated voltage, resonant frequency and test conditions. MANORSHI active piezo buzzer products offer different sound output levels, with selected models ranging from approximately 85dB to 105dB. Always check whether the SPL value is measured at 10cm or 30cm.
8. What Is the Typical Frequency of an Active Piezo Buzzer?
MANORSHI active piezo buzzer models commonly operate at resonant frequencies between approximately 2.8kHz and 4.0kHz. The exact frequency depends on the selected model and its internal oscillation circuit.
9. What Is the Difference Between Rated Voltage and Operating Voltage?
Rated voltage is the nominal DC supply voltage used to specify the buzzer's performance. Operating voltage is the permitted voltage range within which the buzzer can operate. For example, a 12V rated buzzer may support a wider operating voltage range depending on its design. Always follow the specific product datasheet.
10. How Do I Choose Between an 85dB and 100dB Piezo Buzzer?
The appropriate sound pressure level depends on the installation environment, background noise, required warning distance and equipment design. A higher SPL may be suitable for applications requiring a louder warning signal, while a lower SPL may be sufficient for small household devices. Compare measurements under the same distance and test conditions.
11. Can an Active Piezo Buzzer Generate Different Tones?
Most standard active piezo buzzers generate a preset tone determined by their internal oscillator. Selected models may provide different continuous or intermittent sound patterns. If an application requires adjustable frequencies or multiple tones, a passive piezo sounder with an external drive circuit may be more suitable.
12. What Is the Current Consumption of an Active Piezo Buzzer?
Current consumption varies by model, rated voltage and sound output. MANORSHI's listed products include models with maximum current specifications ranging from approximately 7mA to 50mA. Engineers should use the maximum current value in the corresponding datasheet when designing the power supply and control circuit.
13. Can Active Piezo Buzzers Be Used in Home Appliances?
Yes. Active piezo buzzers are commonly used in washing machines, refrigerators, microwave ovens, air conditioners, printers and other household electronic equipment to provide operation feedback, timer alerts and warning signals.
14. Does MANORSHI Provide Active Piezo Buzzer Samples?
Sample availability depends on the selected model and current stock conditions. Customers can provide the model number, required sample quantity and delivery destination so MANORSHI can confirm sample arrangements, pricing and shipping options.
15. Can MANORSHI Supply Active Piezo Buzzers for OEM Projects?
Yes. MANORSHI supplies active piezo buzzers for electronic equipment manufacturers, alarm system developers and component distributors. Customers can submit their voltage, SPL, frequency, dimensions, installation and quantity requirements for model selection and project evaluation.
Contact MANORSHI for Active Piezo Buzzer Solutions
Looking for an active piezo buzzer manufacturer for your electronic equipment, alarm system or industrial control project? MANORSHI offers self-driven piezoelectric buzzers with different rated voltages, dimensions, resonant frequencies and sound pressure levels.
Our product range includes compact 5V and 12V piezo buzzers, high-output alarm indicators, 24V industrial models and selected high-voltage DC products.
Send us your required voltage, sound pressure level, dimensions, frequency and estimated purchasing quantity. Our team can help you identify suitable models and confirm product specifications, samples and bulk order arrangements.
Contact MANORSHI for a Quotation
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