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I think the Chinese converter from eBay would be the better choice. I seems as if it works like a switch-mode power supply (chopper-transformer-rectifier-regulator), whereas the JayCar kit will simply turn the same amount of energy into heat as your mount uses to operate (i.e. it functions as a variable equal resistance serial resistor). Hence, the loss with the Chinese converter will be much less and mostly limited to eddy and hysteresis losses in the transformer.
EDIT – The Chinese converter likely has an efficiency around the 85% mark and won't need a heat sink (less than 3W heat). The JayCar DC regulator can at best reach 50% efficiency and will probably need a heat sink at almost 10W heat dissipation.
Cheers
Steffen.
Last edited by Steffen; 06-05-2013 at 10:53 PM.
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