Creating a sharp click vs soft buzz with LRA Motors

Annie Cao

·December 16, 2025

·9 min read

Creating a sharp click vs soft buzz with LRA Motors

As a design engineer, your job isn't just to make a motor vibrate—it's to engineer a precise physical sensation. The difference between a sharp notification "click" and a soft alert "buzz" from an LRA motor boils down to three controllable parameters: pulse width, drive frequency, and voltage amplitude.

This post breaks down the signal waveform behind each effect and provides a clear path to implement them by adjusting the registers of your driver IC. Let's move from subjective feel to objective, repeatable haptic design.

Key Takeaways

Adjust frequency, voltage, and duration to create sharp clicks or soft buzzes with LRA motors.
For a sharp click, set the frequency to 240-260 Hz, use a short pulse under 50 ms, and apply a high voltage.
To achieve a soft buzz, lower the voltage, extend the duration to 100 ms or more, and maintain the same frequency.
Test the motor in your final device to ensure the vibrations feel right and adjust settings as needed.
Use INEED Linear Vibration Motors for customizable, reliable haptic feedback in various applications.

LRA Motors Basics and INEED Solutions

How LRA Motors Work

You can create precise vibrations in your device by using LRA motors. These motors use a voice coil and a spring to move a mass back and forth. When you apply an AC voltage, the coil vibrates at its resonant frequency. This design lets you control the vibration strength and speed with high accuracy. Unlike ERM motors, which use a spinning counterweight, LRA motors respond much faster and use less power during acceleration. You get higher acceleration and a sharper response, which is perfect for both sharp click and soft buzz effects.

Tip: LRA motors start vibrating in about 10ms, while ERM motors can take up to 50ms. This quick response helps you create crisp, clear haptic feedback.

Here is a quick comparison:

Motor Type	Operating Principle
LRA	Uses AC voltage to drive a voice coil that moves a mass attached to a spring, creating vibrations at its resonant frequency.
ERM	Uses a DC motor with a counterweight that rotates to produce vibrations.

INEED Linear Vibration Motors Features

INEED Linear Vibration Motors give you efficient, customizable vibrations for many applications. You can adjust the frequency and amplitude to match your needs, whether you want a sharp click or a soft buzz. These motors deliver a wide range of vibration strengths and speeds. You can use them in wearables, medical devices, and handheld electronics.

You can also work with INEED engineers to fine-tune the vibration waveform for your specific application. The motors offer ±0.05mm vibration accuracy, a resonant frequency range from 30Hz to 500Hz, and stable performance with low noise. You get reliable vibration motors that last longer and keep your device quiet.

INEED vibration motors support:
- Ultra-precise vibration accuracy
- Customizable frequency and amplitude
- Quiet operation with minimal noise
- Fast response for sharp click and soft buzz effects

You can trust INEED motors to provide consistent vibrations and high-quality feedback in every use.

Sharp Click vs Soft Buzz Comparison

Key Parameters for Sharp Click

You can create a sharp click with LRA motors by focusing on three main parameters: frequency, voltage, and waveform. You need to set the motor to its resonant frequency, which is usually between 240 Hz and 260 Hz for INEED vibration motors. This frequency gives you the strongest vibration and the fastest response. You should use a short pulse, often less than 50 milliseconds, to make the vibration feel like a sharp click instead of a long buzz.

You also need to set the voltage high enough to produce a strong vibration, but not so high that it causes extra noise or damages the motor. Most INEED LRA motors work well at 0.7 to 1.2 Vrms. The waveform you choose matters too. A sine wave at the resonant frequency works best for a sharp click. You can modulate the amplitude to make the vibration even more noticeable.

To create a sharp click:
- Set the frequency to the motor’s resonant point (240–260 Hz).
- Use a sine wave for the drive signal.
- Apply a short, high-voltage pulse (under 50 ms).
- Make sure the amplitude is high for a crisp vibration.

Note: The material or surface where you mount the motor can change how you feel the vibration. Test the motor in your final device to get the best sharp click.

Key Parameters for Soft Buzz

If you want a soft buzz, you need to adjust the same parameters but in a different way. You should use a lower amplitude and a longer drive signal. This makes the vibration feel gentle and smooth instead of sharp. You still use the resonant frequency, but you keep the voltage lower, usually between 0.5 and 1.0 Vrms. The duration of the vibration should be much longer, often 100 milliseconds or more.

Here is a quick reference table for soft buzz settings:

Motor Type	Frequency (Hz)	Amplitude (g)	Duration (ms)
LRA	240–260	0.5–1.5	100+

You can also change the waveform to create different sensations. A sine wave gives you a smooth buzz, while a square wave can make the vibration feel more mechanical. Modulating the amplitude lets you fine-tune the intensity of the buzz.

For a soft buzz:
- Use the same resonant frequency (240–260 Hz).
- Lower the voltage to reduce vibration strength.
- Extend the duration to 100 ms or more.
- Choose a sine wave for a gentle feel.

Tip: Changing the duration and amplitude lets you control whether the vibration feels like a pulse or a steady buzz.

Optimizing LRA Motors for Each Effect

You can optimize LRA motors for both sharp click and soft buzz effects by tuning three main strategies: frequency, voltage, and acceleration. Running the motor at its resonant frequency gives you the strongest and most stable vibration. Adjusting the voltage lets you control the intensity of the vibration. Increasing the acceleration improves the speed and sharpness of the feedback.

Here is a table to help you optimize LRA motors:

Strategy	Description
Frequency Tuning	Set the motor to its resonant frequency for the best vibration and less noise.
Voltage Control	Adjust the voltage to get strong, stable vibrations without extra noise.
Acceleration Optimization	Use short, high-voltage pulses for sharp click. Use longer, lower-voltage signals for soft buzz.

You should always test the vibration motors in your final device. The way the motor is mounted can change the feel of the vibration. INEED LRA motors give you the flexibility to adjust these parameters for any application. You can work with INEED engineers to fine-tune the vibration for your device, making sure you get the exact sharp click or soft buzz you want.

If you want to optimize LRA motors for your project, start by setting the frequency, then adjust the voltage and duration. Test the vibration in your device and listen for any noise. Make small changes until you get the perfect sharp click or soft buzz. This process helps you deliver the best haptic feedback for your users.

Practical Tips for Optimizing LRA Motors

Achieving Reliable Sharp Clicks

You can achieve reliable sharp clicks by focusing on a few key factors for optimizing lra motors. Start by selecting a dedicated driver IC designed for lra motors. This ensures you get precise control over voltage and frequency. Always test the resonance frequency of your motor. For example, the LRA0625BC-0245F model works best at 260 Hz. Operating within this range gives you strong, crisp vibrations and helps in reducing noise and improving vibration quality.

When assembling vibration motors, make sure you mount the motor securely. Loose mounting can cause unwanted noise and reduce the sharpness of the click. Use accelerometers to measure the strength and speed of the vibration. Sine sweep testing helps you find the point of maximum vibration. Regularly check for any signs of fatigue or wear in the motor. This will help you maintain consistent performance and extend the lifespan of your lra motors.

Ensuring Consistent Soft Buzzes

To create a soft buzz, you need to adjust the amplitude and duration of the vibration. Lower the voltage and extend the drive signal. This produces smoother vibrations that feel gentle to the user. Always operate the motor at its resonant frequency for the best results. Regular testing helps you keep the vibration motors working efficiently. Use random vibration testing and laser Doppler vibrometry to check for any inconsistencies in the buzz.

Environmental factors can affect the performance of lra motors. High temperatures can weaken vibrations, and high humidity can cause uneven vibrations. Monitor these conditions and make adjustments as needed. Proactive maintenance, like checking for loose bolts or worn bearings, keeps your vibration motors running smoothly.

Common Pitfalls to Avoid

Avoid common assembly errors that can impact the performance of lra motors. Overdriving the motor can cause the internal mass to hit the casing, leading to noise and fatigue. This can damage the mainspring and weld joints, reducing the lifespan of your vibration motors. Always use the correct voltage and frequency settings.

Here are some tips for overcoming challenges in lra motor optimization:

Use anomaly detection and condition monitoring to spot issues early.
Implement predictive maintenance to reduce downtime.
Test your design in different settings to ensure safety and usability.
Place the motor where vibrations are easy to feel but not uncomfortable.

By understanding lra motors and following these steps, you can enhance efficiency in high-performance applications. Focus on design considerations for vibrating objects and use the advantages of lra motors to deliver better haptic feedback. Improving lra motors starts with careful assembly, smart driver selection, and regular testing. This approach helps you achieve smoother vibrations and reliable performance in all your vibrating object designs.

Quick-Reference Checklist

Sharp Click Settings

You can achieve a sharp click effect with LRA motors by following these settings. Use this table as a quick reference when you set up your vibration motors for a crisp, tactile response:

Setting	Value
DRV2605L_RATED_VOLTAGE	2
DRV2605L_V_PEAK	2.8
DRV2605L_V_RMS	2.0
DRV2605L_F_LRA	205
Waveform Sequences	sharp_click, sharp_click_60, sharp_click_30

Set your LRA motor to these values for the best sharp click. Make sure you use a short, high-intensity pulse. This will give you a strong vibration with minimal noise.

Soft Buzz Settings

For a soft buzz, you need to adjust your vibration motors for a longer and gentler vibration. Use these steps to get a smooth, continuous buzz:

Lower the voltage to between 0.5 and 1.0 Vrms.
Set the frequency to match your LRA motor’s resonant point, usually 240–260 Hz.
Extend the vibration duration to 100 ms or more.
Use a sine wave for a smooth feel.

Tip: Test the vibration in your device to make sure it feels gentle and steady. Adjust the amplitude if you want a softer or stronger buzz.

INEED Motors Application Guide

You can use INEED Linear Vibration Motors in many devices. Each device type may need different vibration settings. Here is a table to help you choose the right setup for your application:

Device Type	Vibration Motor Type	Recommended Settings
Smartphones	Linear Resonant Actuators	Efficient power usage, quick feedback
Wearables	Linear Resonant Actuators	Detailed feedback, low power consumption
Game Controllers	DC Motors	Strong feedback for immersive experience
Smartwatches	Linear Resonant Actuators	Alerts and notifications with haptic feedback

You should always test the vibration motors in your final product. Check that the vibrations feel right for your users. Adjust the motor settings as needed for the best experience. INEED motors give you the flexibility to fine-tune vibrations for any application.

You can create both sharp clicks and soft buzzes by adjusting frequency, voltage, and duration on your LRA motors. INEED Linear Vibration Motors help you achieve reliable haptic feedback in your projects. These motors offer several key benefits:

Benefit	Description
Small Size	Fits easily into many electronic devices.
Energy Efficiency	Uses less power for longer battery life.
Reliability	Works well even in tough conditions.
Customization Options	Lets you match settings to your application.
Improved User Experience	Gives accurate and steady feedback.

Use the quick-reference checklist and INEED solutions to get the best results in your next design.

FAQ

How do you choose the right LRA motor for your device?

You should check your device size, power needs, and feedback type. INEED offers various models. Use their datasheets to match frequency and voltage.

Tip: Contact INEED for custom solutions if you have special requirements.

What driver IC works best with INEED LRA motors?

You can use driver ICs like the Texas Instruments DRV2605L. This IC supports waveform libraries and precise control.

Always match the IC to your motor’s voltage and frequency specs.

Why does my LRA motor feel weak or inconsistent?

Check your voltage and frequency settings first. Make sure you use the resonant frequency.

Issue	Solution
Low voltage	Increase voltage
Wrong frequency	Adjust to resonance

Can you use LRA motors in wet or outdoor environments?

INEED LRA motors work in many conditions. For wet or outdoor use, choose models with moisture resistance.

Note: Always seal your device properly to protect the motor from water.