SFM27-II Active Buzzer 3–24V DC Intermittent 30x15mm
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Prices updated: 13 Oct 2026
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About this product
A piezoelectric active buzzer that produces an intermittent alert tone at 3–24 V DC. The listing rates its output above 95 dB. Its compact 30 × 15 mm size suits alarms, alert signals and DIY electronics projects, where a simple on/off DC supply is enough to make it sound.
Specifications
- Type
- Piezoelectric active buzzer / جرس نشط كهروضغطي
- Operating voltage
- 3–24 V DC / 3–24 فولت تيار مستمر
- Sound output
- Over 95 dB (as listed) / أكثر من 95 ديسيبل (حسب الوصف)
- Sound pattern
- Intermittent / متقطع
- Size
- 30 × 15 mm / 30 × 15 مم
Frequently asked questions
Does an active buzzer need a PWM signal to sound?
No. An active buzzer has its own internal oscillator, so applying DC voltage within its range is enough to produce the tone. A PWM signal is needed only for passive buzzers.
How do I connect it to an Arduino?
Connect the positive lead to a digital output pin or a suitable 5 V supply, and the negative lead to GND. If the current draw is higher than the pin can safely supply, drive it through a transistor.
