Power Supply TO220 vs TO3?

[Dave Wilke]

Design and planning continues for my modular (mostly based on EFM's stuff).

An engineer friend dropped by and said my +/-12v PS design would simply 
catch fire because I'd used TO220 7812 & 7912 regulators instead of going 
with TO3 packages.

Should I be concerned?  What would the expected current draw be from (let's 
say) 18 modules of the VCA5b and deg2a sort?  Can I get away with TO220's or 
do I need to do a (third) redesign using TO3's?

dave

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