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Quote:
Originally Posted by rotorwrench
I've been around dropping and regulating systems for a long time and all of them generate heat. Most are insulated from making contact with flammables. The flea-pay stuff doesn't look like it has any way to get rid of the heat plus it has a two wire input and a two wire output. How are you supposed to insulate your load from ground?
I would be skeptical about the longevity of those products and whether they are safe to use or not. You certainly don't want your car to catch fire due to a poorly made product. -Caveat Emptor-
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Certainly doing what you know works is a good bet. "switching" power supplies and "buck-boost" converters are much more efficient than a dropping resistor of some kind, and really don't generate hots of heat. They are used in all kinds of electronics.