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You can find the power supply for the STEMINC - SMUTK1660RS111 - Mist Generation Kit - 1.66 MHz, 350cc/Hr at
www.jameco.com (JAMECO) and the part number is: 104417.
Also, click on the following link to see the layout of the board, how to connect the water level sensor and also the variable resistor (or if you want maximum output you can just solder a bridge between the two points).
You can also see some details about how the height of the water column should be maintained for best performance.
STEMINC - PIEZOELECTRIC CERAMICS - MIST GENERATION KIT Also click on the layout link inside that same page.
This mist generation kit works great!
Cheers!