Good day to all. I'm working on a project where I need an power supply adjustable over=20 the range of < 15Vdc through 100Vdc at 300mA max. I've done tons of=20 adjustable supplies in the past: good old LM723 linear regulator,=20 adjustable 3-terminal regulators, single-chip switch-mode supplies=20 (Nat Semi Simple Switcher series). But nothing with this high a=20 voltage. Input supply is 120Vac nominal. I greatly prefer to stay with Switch Mode for efficiency reasons. My=20 first thought was to simply grab an open-frame SMPS from Meanwell or=20 whoever and make the control circuit adjustable. But I'm not finding=20 any open-frame supplies in that 100Vdc output range and I really=20 don't want to control two independent 48V supplies in series. I've looked at lab supplies - there are many available from Digikey=20 but the price is prohibitive (a grand plus). The total projected usage over this project's lifetime is perhaps a=20 few dozen units. I don't really care at this point whether I build something suitable=20 or purchase. I'm looking for suggestions before I go blindly down the path that=20 looks the easiest at this point in time. Many thanks! dwayne --=20 Dwayne Reid Trinity Electronics Systems Ltd Edmonton, AB, CANADA (780) 489-3199 voice (780) 487-6397 fax www.trinity-electronics.com Custom Electronics Design and Manufacturing --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .