Passive Buzzer Module-Adapt to LEGO
📦 Location of the warehouse: China
Free shipping for you
Free Shipping from 30€ in Germany, 50€ in the EU!
Trustpilot rating: 4/5
Thank you for your support - rate us on Trustpilot!
Passive Buzzer Module-Adapt to LEGO
A passive buzzer is a buzzer without an internal oscillator. When powered, the internal oscillator does not produce a buzzing sound. It requires a 2~5 kHz square wave to drive it, and different frequencies of waveforms will drive the buzzer to produce sounds of corresponding frequencies. Common musical cards that play "Happy Birthday" or Christmas tunes when opened use passive buzzers to achieve this effect.
Differences Between Active and Passive Buzzers:
-
Internal Oscillator and Drive Circuit:
- Active Buzzer: Contains an internal oscillator and drive circuit. It sounds like power is applied.
- Passive Buzzer: Requires an external square wave signal to produce sound. The sound frequency is controllable, allowing it to create musical notes (e.g., "Do Re Mi Fa Sol La Ti"). In some cases, it can share a control pin with an LED.
-
Sound Testing:
- To test a buzzer, connect the black probe of a multimeter to the "+" pin of the buzzer, and touch the red probe to the other pin:
- If a clicking sound is produced and the resistance is about 8Ω, it is a passive buzzer.
- If a continuous sound is produced and the resistance is several hundred ohms, it is an active buzzer.
- To test a buzzer, connect the black probe of a multimeter to the "+" pin of the buzzer, and touch the red probe to the other pin:
-
Vibration Frequency:
- Apply a DC voltage (adjustable from low to high) to the buzzer:
- If it sounds directly at around 2.7 kHz, it is an active electromagnetic buzzer.
- If it does not sound directly and requires a square wave to drive it, it is a passive electromagnetic buzzer.
- Apply a DC voltage (adjustable from low to high) to the buzzer:
Schematic Diagram
Effective Date: March 27, 2025
At OpenELAB, we are committed to providing accurate product descriptions and delivering high-quality products. If you experience any issues with your purchase, please notify us within 60 days of the shipment date.
1. Warranty Disclaimer
Unless explicitly stated in a specific agreement or purchase order, OpenELAB makes no warranties—express or implied—regarding the fitness, suitability, or merchantability of any product for a particular purpose or special use.
2. Warranty Policy
Warranty Period
The standard warranty period for products sold by OpenELAB is 12 months from the date of delivery.
Under this warranty, OpenELAB will make a reasonable effort to repair or replace products free of charge if defects are due to issues with raw materials, design, or manufacturing.
If the defect qualifies under this policy but falls outside the covered scope, reasonable charges may apply for repair or replacement.
After the warranty period, support may still be available at a reasonable fee.
Warranty Exclusions
The warranty does not apply in the following cases:
- The product is beyond the 12-month warranty period.
- Damage due to misuse, improper maintenance or storage, or failure to follow the user guide or manual.
- Issues caused by Force Majeure events (e.g., natural disasters, war, legal changes, etc.).
- Unauthorized repair attempts by the customer.
- The product is not defective but has been opened and is non-returnable by policy.
3. Returns & Refunds
If you're not satisfied with your purchase, you may be eligible for a return or exchange:
- Return for Refund: Within 15 days of receipt (unopened).
- Return for Replacement: Within 30 days of receipt (damaged or defective).
- Exchange Window: Up to 30 days from receipt.
Please email us at info@openelab.io for a return authorization before sending anything back.
Return Conditions
- Items must be in original, clean, and mint condition with packaging intact.
- Returns of damaged, used, scratched, modified, or programmed items will not be accepted.
- Include the receipt, a brief note with your name, order number, and reason for return.
Shipping & Fees
- Customers are responsible for return shipping to our warehouses in Europe, the US, or China.
- Refunds may be subject to additional shipping fees unless the return is due to our error.
- A flat €8 shipping fee will be deducted for returned items that originally qualified for free shipping.
Payment Platform Fees
For refunds processed through third-party platforms such as PayPal or Braintree, a standard 3.5% service fee may be deducted to cover payment processing costs.
