Description

XKT-202 Ultrasonic Atomizer Driver Bare PCB – 108 kHz Water-Level Detection

Product Overview

The XKT-202 Ultrasonic Atomizer Driver Bare PCB is a compact DIY circuit board designed for building a small ultrasonic mist generator, humidifier, or atomizer using the XKT-202 controller IC.

The board is designed to drive a 108 kHz piezoelectric atomizing transducer through an external resonant inductor and MOSFET switching stage. It also provides a water-level monitoring function through dedicated sensing points, allowing the circuit to stop the atomizer when water is insufficient.

The PCB includes footprints for the XKT-202 IC, MOSFET, resonant inductor, capacitors, resistors, piezoelectric transducer connections, power input, and water-level sensing electrodes.

This product is supplied as a bare PCB for DIY assembly. Components are not installed.

Key Features

• Designed for XKT-202 ultrasonic atomizer controller IC
• Approximately 108 kHz ultrasonic operating frequency
• Designed for ultrasonic humidifier and mist-maker applications
• Supports water-level detection
• Automatic dry-run / low-water protection through the XKT-202 control circuit
• External MOSFET switching stage
• External resonant inductor
• Dedicated Piezo+ / Piezo− output connections
• Dedicated water-level monitoring test point
• Compact PCB design
• Clearly labeled power and signal connections
• Suitable for DIY soldering and prototyping
• for More info and SMD assembly Guide please visit our Repo on GitHub

Technical Specifications

*Values are typical values provided for the XKT-202-based application and may vary depending on the actual IC, piezoelectric disc, inductor, MOSFET, and circuit configuration.

PCB Connections

The board provides clearly marked connection points for easy assembly and wiring.

Main Components

The PCB provides footprints for the following components:

The exact component specifications should be selected according to the intended atomizer disc and operating conditions.

How It Works

The XKT-202 generates the control signal required for ultrasonic atomization. The controller drives the AO3400A MOSFET switching stage, which works together with the resonant inductor and piezoelectric transducer to generate the ultrasonic excitation required for mist generation.

A dedicated sensing circuit is also provided for water-level monitoring. When the sensing conditions indicate insufficient water, the controller can stop the atomizer drive to help prevent dry operation.

Typical Applications

The assembled board can be used for:

• DIY USB humidifiers
• Mini ultrasonic humidifiers
• Aroma diffusers
• Small mist generators
• Portable humidifiers
• Water-level-controlled atomizers
• DIY cooling/misting projects
• Educational ultrasonic electronics projects
• Custom mist-making devices

What’s Included

• 1 × XKT-202 Ultrasonic Atomizer Driver Bare PCB

Components NOT Included

The bare PCB does not include:

• XKT-202 IC
• AO3400A MOSFET
• Resonant inductor
• Piezoelectric atomizer disc
• Resistors
• Capacitors
• Wires or connectors
• Power supply

All components must be sourced and soldered separately by the user.

DIY Assembly

This PCB is intended for users who want to build their own XKT-202 atomizer circuit.

The board provides clearly marked component footprints and connection points to simplify assembly. After populating the PCB with the required components, connect a suitable 5 V power source and compatible 108 kHz piezoelectric atomizer disc.

Always verify component values, polarity, MOSFET orientation, and the resonant inductor specification before powering the completed circuit.

Important Notes

• Bare PCB only — this is not a ready-to-use atomizer module.
• The PCB requires the appropriate components to be installed before operation.
• Use a piezoelectric atomizer disc compatible with the intended operating frequency.
• The actual operating frequency and output power depend on the XKT-202 IC, piezoelectric disc, inductor, MOSFET, and component tolerances.
• Do not operate the completed atomizer without appropriate water-level protection.
• Use a suitable regulated power supply.
• The PCB itself does not include a USB connector or power supply unless separately populated.