Alessandro Queri wrote: > I have 5v supply (single rail, DC) and I want REALLY CLEAN +/-12v @ > 50mA. Consider that conversion should not generate noise in 50 KHz+ > Band AT ALL!!! This is not possible. It is a useless specification. Figure out how much you can really tollerate. And, how clean is "really clean"? ***************************************************************** Embed Inc, embedded system specialists in Littleton Massachusetts (978) 742-9014, http://www.embedinc.com -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads