10mm (175 kHz): High frequency due to small size, producing very fine droplets (1-5 microns) for applications like medical nebulizers or perfume atomizers.
16mm (~108 kHz): Common for small desktop humidifiers, moderate droplet size, and mist output (30-60 ml/hour).
20mm (108kHz): Similar frequency to 16mm but larger surface area for higher output (up to 300 ml/hour), used in everyday humidifiers.
25mm (108 kHz): Larger disc, often slightly lower frequency (closer to 100 kHz), for high-volume mist (380-450 ml/hour) in room humidifiers or industrial applications.frequency for precision and portability, larger/lower-frequency for volume. For universal mini humidifiers,

• 20mm disc (~108 kHz): Typically needs 24-48V Vpp, though some high-efficiency models may work with as low as 12-24V Vpp when paired with a tuned resonant circuit.
• 25mm disc (~108 kHz): Often requires 36-100V Vpp due to its larger size and higher mist output (380-450 ml/hour), which demands more power.

Input Voltage for Driver: The piezo disc itself doesn’t connect directly to a power supply or Arduino. Instead, a driver circuit (e.g., a dedicated ultrasonic atomizer module or custom circuit with a transformer)

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