On Sat, 14 Sep 2002, Alan B. Pearce wrote: >>Unless you guarantee a minimum load it will >>be 'chaotic' in operation. > >I understand that. My reckoning is that the minimum load will be a 16F877(A) >running at 3.6MHz, and miscellaneous 74HC logic, along with a MAX202, an >FTDI FT232B and maybe a power LED, so I figured a minimum load should not be >too much trouble. I usually ensure 5 to 10% of full load for 78S40. Sometimes I have to use a resistor across the output to achieve this. The problems occur only in RFI/radioation, not in ripple and output voltage. Peter -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads