10-Pack 3040 Passive Piezoelectric Buzzers, 4 kHz, Pre-Wired

A passive buzzer stays silent until the board feeds it a signal, which is why it suits builds where the tone comes from code. These 3040 piezo buzzers take 1 V to 30 V, run at 4 kHz and arrive pre-wired on a 60 mm lead. Ten in a pack cover spares.

The Tone Comes From Your Code, Not the Buzzer

✅ Ten in the pack Ten units cover a build, a spare and the second board you will want later.

✅ Tone set by the signal A passive element takes its pitch from the signal you feed in, so the sketch decides.

✅ Voltage range A 1 V to 30 V range covers 3.3 V and 5 V logic boards and 12 V projects.

✅ Lead already fitted A 60 mm wire means the buzzer can sit behind a panel without extra soldering.

✅ Small footprint At 39.5 mm across and 4 mm deep it fits a compact prototype case.

Passive is the detail that catches people out. An active buzzer sounds as soon as it sees DC; this one needs an alternating drive signal around its 4 kHz operating frequency and stays quiet on a steady supply. Plan a driver pin or a transistor, not just a rail.

The obvious build is an alarm or a kitchen timer. Mount the buzzer behind a drilled hole, run the 60 mm lead back to the board and let the firmware decide the pattern: short beeps for a warning, a continuous tone for a fault.

The working range of -20 °C to 60 °C covers indoor builds and a sheltered workshop. Inside a sunlit outdoor enclosure the air gets hotter than the outside temperature, so keep the buzzer away from the lid and out of direct sun.

Technical details

• Model: 3040
• Type: Passive piezoelectric buzzer
• Pack quantity: 10 pieces
• Diameter: 39.5 mm
• Depth: 4.0 mm
• Lead length: 60 mm
• Operating voltage: 1 V to 30 V
• Operating frequency: 4000 Hz
• Operating temperature: -20 °C to +60 °C

Check that your driver pin can deliver a 4 kHz signal, then keep the pack of ten.

See more: explore more audio devices