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Old 06-09-2008, 07:57 PM   #11 (permalink)
dcb
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Need is a strong word, and it is a little specious to suggest the failure mode of andrews LCD AND to go from "person" to "people", but nonetheless...

On the one hand, there are plenty of examples of 7805's in automotive service in the homebrew/diy niche, where it is deemed "good enough" with a couple capacitors on it. With the standard LCD we are barely at 1/5 the capacity of the regulator.

On the other hand, there are a couple examples where they go to great lengths to protect the voltage regulator, the megasquirt comes to mind, but its schematic seems to be something of a paradox in itself.

Tell you what, Sourcing a 30 volt zener isn't terribly bad, it adds a component, but I cannot believe that there isn't a common 5 volt voltage regulator in existence designed for automotive use. Can somebody mouse around and see if the 7805 should be obsolete for automotive use and replaced with something better?

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