There was no need for this to be a private message to me. It should have been sent to the list. Alessandro Queri wrote: > I want no noise in the _50Khz_+_ band, (+!). You still don't get it. For the third time, specifying zero ("no") noise is an impossible, useless, and therefore stupid specification. It won't happen in your circuit. It's never going to happen. It doesn't matter how low your switching frequency is. Maybe someone else can explain it to this guy. I'm giving up. ***************************************************************** 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