DVTR2815D
Delta High Reliability Hybrid Mil-Spec DC-DC Converter 50VDC 40W DVTR2815D
A nice touch is how the UV resistant and waterproof layers keep it safe under direct sun or rain.
Delta High Reliability Hybrid Mil-Spec DC-DC Converter DVTR2805 50V max to 5VDC
A nice touch from TEAC Corporation and Tascam is the built-in effects on some models.