Changes
Items to buy:
digikey:
* adj. LDO -20V, 1A http://search.digikey.comch/scripts/DkSearch/dksus.dll?Detail&name=P12299SCTNCP1117STAT3GOSCT-ND*3.3V LDO -18V http://search.digikey.ch/scripts/DkSearch/dksus.dll?Detail&name=AP1117E33GDICT-ND
ebay:
*