On 21/12/2007, M. Adam Davis wrote: > Also kee in mind that while the ice is at a nice cool -10C, it is very > unlikely that the air high off the ice is at that same temperature - > though it can get down there - especially when the rink (and therefore > your device) is in use. Consider mounting the power supply outside > the rink. This device is going to reside within a box outside the rink, in the "speaker's corner". It's a control device for a beacon project I'm working on. While it's not in direct contact (or near) the ice, the air temperature is pretty cold in the arena. Atleast in the place where the spectators are, but I'm not yet sure about the "speaker's corner". I have sent an inquiry to the club to measure it for me, but I find it difficult to believe it is above 0 degrees. The higher the input voltage the quicker the LM317 will dissipate heat, kind of heating itself up. But what David VanHorn suggested, building the circuit and put it in the freezer (or something) and then powering it up to see what happens, is not a bad idea at all. -- - Rikard - http://bos.hack.org/cv/ -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist