Burned chip!

[peter paul fenske]

Hi Guys and Gals

With the 7805 make absolutely sure you provide
a low AC impedance one the input and output or they can
oscillate. This is very unpredictable and varies greatly
among brands.. An oscillation can set in and the chip
will burn up. This has nothing to do with DC dissipation

The gist is to use the two 1 uf caps recommended tantalums
preferred because of their low impedance

later:peter