In SX Microcontrollers, SX/B Compiler and SX-Key Tool, brianbr wrote:

[quote="Basic Jim"]So, If I put a larger heat sink I should be OK with 12 volts? that should be easy and cheap!

Thanks,

Jim W.[/quote]

No you won't be that OK. I have used he SX48 with 12volts and it runs too warm over a period of time to my liking. Especially if its gonna be buttoned up some place or worse, under the hood. The easiest solution is to offload some of that voltage/power with a three to five 1N4000 series diodes in series with the 12V line, which will drop .7volts per diode. Rememeber that "12v" with regard to a car is a eumphemism for what in reailty is 13-14 volt system. The regulators put ot in the vicinity of 13.8volts. The batteries generally settle down in the low 12v range when the engine has been shut off. And it might not hurt to have a hefty choke in that line to beat down startup transients, as well as an overvoltage protection diode across the input. Automobiles are a very electronics unfriendly environment..

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