On 24.03.12 11:23, gene heskett wrote: > But would you believe the shack no longer carries the insulator kits for > hot tabbed TO-220's? So I came home & spent the rest of the afternoon > demolishing an Antec 600w psu that did the usual Antec failure, its 5 volts > was down to 4.82, exactly 2 weeks out of warranty 2 years ago. 2nd time a > high priced Antec has done that to me. To get 2 only to-220 insulation > kits out of it, and of course a huge supply on multicolored wires to finish > up my box with.
Some of the PSUs I've stripped had one big strip of it for a whole row of TO-220s. If pushed, I'd mount the LM317 on an Al heat spreader plate to give 10 times the area of the TO-220 tab, then sandwich a strip of the insulator between that and the real heatsink, held with some nylon bolts. That should give a tenth of the temperature drop for the same heat flow. Maybe Digikey has rolls of the stuff? Either that, or mount the LM317 directly on the heatsink, mounted on nylon standoffs, inside the case, somewhere in that wind tunnel you're making with the supercharged fan farm? ;-) > So that goes in the box next. I have some lexan, and am considering > machining the lid to add a window above the C1G so I can see all them > purty leds flickering away as it works. That seems worth doing, especially if it goes up on that high shelf, where it's highly visible. > On Saturday, March 24, 2012 10:07:19 AM Erik Christiansen did opine: > > Having just finished subroutines in the translator, I'm about to embark > > on while loops, and was just looking in the on-line doco for a > > declaration on whether they have their own scope. Your experience > > suggests that is the case. Then they should perhaps be demarcated in the > > same way as subroutines. After reading these docs: http://www.linuxcnc.org/docs/devel/html/gcode/overview.html#_parameters_variables_a_id_sec _parameters_a it seems clear that the only local scope in LinuxCNC gcode is in subroutines: » Scope The scope of a parameter is either global, or local within a subroutine. « That only deepens the mystery of your variable disappearing on leaving a while loop. Erik -- If at first you don't succeed, try again. Then Quit. No use being a damn fool about it. - W.C. Fields ------------------------------------------------------------------------------ This SF email is sponsosred by: Try Windows Azure free for 90 days Click Here http://p.sf.net/sfu/sfd2d-msazure _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
