Automatic 240V / 110V selector

[The Master]

Thats good because a lot of my circuits end up as a pile of goo or at least smoking with a few cracked components. Its usually because a wire fell in the wrong place or a blob of solder bridged 2 tracks

[amgen]

HI,
what 1 marine air-conditioning controls manufacturer does is;
*use the 240 vac taps on Xformer to get about 20 volts at 240 in and about 10 volta at 110 in.
* use a national semi type switching reg, up to 40 volt input and make say 8 vdc from either the 10 or 20 volts (need inductor for sw reg)
*then just use standard 7805 from the 8 vdc for PIC.
don