> **Source:** Core Electronics is an Australian maker-electronics retailer and manufacturer based in Newcastle, NSW, run by a team of makers and educators. We design and manufacture our own product lines (PiicoDev, CE originals) and are official retailers for iconic maker and industrial brands including Raspberry Pi, Arduino, Adafruit, SparkFun and DFRobot. Orders ship Australia-wide from our Newcastle warehouse. Prices are in AUD and include GST. Pricing, stock and dispatch on this page are generated from the store's live catalog. Full machine-readable index: https://core-electronics.com.au/llms.txt

# Piezo Buzzer

**Type:** Product page · **SKU:** CE09240 · **Brand:** [Core Electronics](https://core-electronics.com.au/brands/core-electronics-australia)
**Page:** https://core-electronics.com.au/piezo-buzzer.html ([markdown](https://core-electronics.com.au/piezo-buzzer.html.md))

Add a loud buzzer alarm or indicator to your projects. Drive this using PWM or code to switch between 0 and 3-5V for loud output.

## Pricing

- **Price:** $0.34 (inc GST) — $0.31 AUD, exc GST
- **Quantity discounts:** 5+ $0.30 (exc GST) · 15+ $0.29 (exc GST)

## Availability & dispatch

- In stock, ships same business day if ordered before 2PM (Australia/Sydney).
- We can dispatch 213 today; more stock is typically available with a 8–12 day lead time.

## How to buy

- **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=CE09240:1` (comma-separated SKU:qty pairs) and share the link. Opening it shows a confirmation page with live pricing and stock before anything is added to the cart.
- **Verify the cart first:** fetch `https://core-electronics.com.au/cart/link/CE09240:1.md` for live line prices (inc & exc GST, quantity discounts applied), stock and dispatch estimates, and totals. Append `/to/{AU-postcode}` (or `/to/{country-code}:{postcode}`) before `.md` for delivery options and prices to that destination. Unknown, retired, or out-of-stock SKUs are flagged. (Query form `cart/link.md?items=...` also works but some robots parsers refuse query strings here.)
- **Checkout** is completed on-site and includes a captcha at the payment step. Share the cart link; checkout takes it from there.
- **Search the catalogue:** `https://core-electronics.com.au/search/{query}.md` (URL-encode the query; pages 2-3 at `search/{query}/{page}.md`; `search.md?q=` also works)
- **Payment methods, purchase orders, policies and contact details:** https://core-electronics.com.au/llms.txt
## Description

Piezo transducers or "buzzers" have a special crystal inside that expands and contracts when you apply a voltage. You can harness this effect by driving using PWM or code to switch between 0 and 3-5V really fast to create quite a loud sound. It's a passive buzzer which means it needs an alternating voltage. Just supplying it with 3-5V constantly won't emit sound.

You can get even louder by connecting to two GPIO to either end and alternating HIGH and LOW on each pin. This is called a "differential drive" and effectively means the Piezo element sees +3V and -3V instead of just +3V and 0.

Plugs right into a breadboard to get started quickly.

### Specifications

- 11mm diameter
- 9mm tall
- 5mm leads
- Use with 3-5V logic
- Passive buzzer design

### Examples

**Raspberry Pi Pico - Micropython**

 ```
from machine import Pin, PWM
from utime import sleep

# Set up buzzer pin and PWM
buzzer_pin = Pin(7, Pin.OUT)
buzzer_pwm = PWM(buzzer_pin)
buzzer_pwm.duty_u16(1000)

for freq in range(500, 1400, 100):
    # Set buzzer frequency
    buzzer_pwm.freq(freq)
    # Wait
    sleep(.3)

# Turn off the buzzer
buzzer_pwm.duty_u16(0)
```

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/C/E/CE09240-1.jpg)