NERD ALERT Pure Electronics Question
I want to use 78xx voltage regulators in my 36 volt lighting. To power integral with heatsink 1 watt fans. Clarification: I purchased new surplus PC obsolete heatsinks with ball bearing fans for less ...
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A quick google search found some other nerds asking about power dissipation for a MOSFET in a TO220 case. They came up with ~62 degrees C per watt. So if your fan current times the 6V you're dropping from 18 to 12 is a watt or less it'll probably be similarly ok for your 78xx.
