Dual voltage options: 5Vo-p (30Ω) and 12Vo-p (120Ω)
800Hz resonant frequency for external square wave drive
Min. 85dB sound pressure at 10cm under rated drive conditions
PBT housing for structural stability
-20℃ to +70℃ operating temperature range
Two coil resistance options to match different driver circuit designs
The MEIDI KC2512 25mm Electromagnetic Passive Buzzer is an electromagnetic passive buzzer designed for applications requiring external drive signal for sound generation. At 25mm body diameter, this buzzer accommodates two distinct coil configurations to suit different voltage rails and driver circuit requirements.
The KC2512-30R variant operates at 5Vo-p with a 30Ω coil. The KC2512-120R variant operates at 12Vo-p with a 120Ω coil. Both variants resonate at 800Hz and require external square wave excitation at or near this frequency for optimal acoustic performance.
The PBT housing provides dimensional stability across the rated operating temperature range. For applications requiring alternative coil resistances or voltage ratings, contact MEIDI for custom buzzer configurations.
Dual coil configuration --- 30Ω (5V) and 120Ω (12V) options to match different system voltage rails
External drive architecture --- accepts square wave signals at 800Hz; requires AC excitation, DC voltage alone will not produce audible output
25mm form factor --- standard diameter for common panel and PCB mounting layouts
Stable acoustic output --- Min. 85dB at 10cm when driven at rated voltage and resonant frequency with 50% duty cycle square wave
PBT housing material --- provides structural integrity across the operating temperature range
Broad operating temperature --- -20℃ to +70℃
| Parameter | KC2512-30R | KC2512-120R |
| Product Type | Electromagnetic Passive Buzzer | Electromagnetic Passive Buzzer |
| Rated Voltage | 5Vo-p | 12Vo-p |
| Operating Voltage | 3--7Vo-p | 9--14Vo-p |
| Rated Current (MAX) | 30mA | 40mA |
| Min. Sound Output at 10cm | 85dB | 85dB |
| Coil Resistance | 30 ± 5Ω | 120 ± 15Ω |
| Resonant Frequency | 800Hz | 800Hz |
| Housing Material | PBT | PBT |
| Operating Temperature | -20℃ ~ +70℃ | -20℃ ~ +70℃ |
| Storage Temperature | -30℃ ~ +80℃ | -30℃ ~ +80℃ |
| Net Weight | 8g | 8g |
Industrial control panels and PLC systems requiring audible status indication with external drive circuitry
Consumer appliance control boards utilizing 5V or 12V logic outputs for alarm and alert functions
Security and access control systems with dedicated buzzer drive outputs
Test and measurement equipment needing audible feedback during operation sequences
Power supply and UPS units for fault condition audible warnings
Building automation systems with centralized alarm notification modules
| Design Requirement | KC2512 Advantage |
| Flexible voltage rail compatibility | Dual variants (5V/30Ω and 12V/120Ω) |
| Consistent acoustic character | 800Hz resonant frequency |
| Standard mounting integration | 25mm diameter for common panel cutouts and PCB layouts |
| Driver circuit matching | Two coil resistance options for different sourcing/sinking capabilities |
| Environmental durability | PBT housing rated for -20℃ to +70℃ operation |
MEIDI manufactures the KC2512 series with quality control processes covering incoming material inspection, in-process monitoring, and final electrical testing. Each production batch undergoes verification of resonant frequency, coil resistance, and sound pressure level to confirm conformance with datasheet specifications.
The KC2512 series is subjected to environmental and mechanical stress tests to verify durability under typical operating and storage conditions. After testing, the product shall meet acceptance criteria with no defects in appearance or electrical properties.
| Test Item | Test Conditions |
| Life Test | Rated voltage, 1/2 duty resonant frequency square wave, 96 hours at 25±10℃ |
| High Temperature Test | +80℃ storage for 96 hours, recover at room temperature for 3 hours before testing |
| Low Temperature Test | -40℃ storage for 96 hours, recover at room temperature for 3 hours before testing |
| Humidity Test | +40±3℃, 90%--95% RH, 48 hours, recover at room temperature for 6 hours before testing |
| Thermal Shock Test | 70℃ 2 hours → -20℃ 2 hours (1 cycle), interval 1 hour between cycles, total 10 cycles |
| Drop Test | Standard packaging, all 6 faces and 3 edges, drop from 1.2m height onto thick wood board |
| Vibration Test | 1000 cycles/min, amplitude 1.5mm, 1 hour per axis, 3 axes total |
Caution: Avoid foreign materials entering the product, including magnetic materials, water-soluble materials, and corrosive gases, as these will affect electrical performance.
1. Does the KC2512 require an external drive signal, or can it be driven with DC voltage?
As a passive electromagnetic buzzer, the KC2512 requires an external AC signal --- typically a square wave at or near 800Hz --- to generate audible output. DC voltage alone will not produce sound and may damage the coil through continuous current flow.
2. Which KC2512 variant should I select for a 5V microcontroller system?
Select the KC2512-30R for 5V systems. The 30Ω coil resistance is rated for 5Vo-p operation with a maximum current draw of 30mA. Verify that your driver circuit can source or sink the required current, or use a transistor buffer stage.
3. What is the recommended driving frequency for maximum sound pressure output?
Maximum SPL occurs at the resonant frequency of 800Hz. SPL decreases when driven off-resonance. For consistent Min. 85dB output, drive at 800Hz with 50% duty cycle square wave at the rated voltage for the selected variant.
4. What driver circuit is suitable for the 120Ω KC2512-120R variant?
Standard open-collector or push-pull transistor configurations are compatible. The 120Ω coil draws a maximum of 40mA at 12Vo-p. For microcontroller GPIO direct drive, verify the port current capability. A flyback diode is recommended when driving inductive loads.
5. Are custom coil resistances or resonant frequencies available for the 25mm form factor?
Contact MEIDI for technical inquiries regarding custom configurations within the KC2512 series or related electromagnetic buzzer products.
For technical datasheets, drive circuit application notes, or OEM configuration discussion, contact MEIDI applications engineering.
| Item | Specification |
| Product Type | ELECTROMAGNETIC BUZZER |
| Quantity | Contact MEIDI for packaging details |
| Carton Volume | Contact MEIDI for packaging details |
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