Quote Originally Posted by Dennis View Post
Just to throw a 'spanner in the works' , if I do eventually use a transformer based supply like the dimmer attachment, what would be the smallest footprint 220V to 9V/5V transformer I could use ?

Kind regards
Dennis
Dunno what the smallest available size would be, but I like these quite a lot for only $2.67USD each in 10 quantity:
http://ww2.pulseeng.com/products/dat.../LT2007_04.pdf

I use 6 volt output... rectified and filtered it's perfect for powering a LDO to get 5 volts at up to 80mA.

Size is 22mm x 23mm x 19mm.

Small, cheap, safer than transformerless supplies, and able to produce plenty of current for powering a PIC + accessories.

For circuits where an "external" power supply (wall wart) is acceptable, I use these or something similar:
http://search.digikey.com/scripts/Dk...P6P-ND&stock=1



steve