Eloi,
I used the following regulator board.
VIKINS LM2596 DC-DC Adjustable Voltage Regulator 4.0-40V to 1.25-37V DC, 36V to 24V to12V to 5V Variable Volt Power Supply with digital Display.
I have one in the 3" housing and I just purchased a 2" housing to make a camera which is a great size.
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