Have you thought about replacing the 7805 with a switch mode regulator? More expensive than cheap-as-chips 7805 but waaaayyy more efficient. That means they will run cold and you shouldn't need to worry about the ambient temperature in your case. Two to look at, both of which are pin-compatible with 7805 as I recall.
*Murata OKI-78SR-5/1.5-W36-C* *Traco TSR 1-2450* I've used the Traco one myself in a clock design, and it's fantastic - very small and straightforward to use. Likely around 90% efficient in your setting. Cheers, Jon. -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to neonixie-l+unsubscr...@googlegroups.com. To post to this group, send an email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/5b7d0f6e-30a7-4cb1-a45d-cfd850fed1c3%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.