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My conclusion is the OP may have chosen the wrong component from the library during layout. The 78xx family of regulators would match the input, "common" and output pinout in the layout. I'm thinking maybe the OP may have assumed an identical pinout between the 78xx family and the LM317. Just guessing at this point, but it may be the root cause. What are your thoughts?
yes that is what happen the program i use contain only a general symbol for regulators(which was for 78xx) so pin#1 and pin#2 are incorrectly connected.this what cause the problem ,i'l fix it tomorrow and back with the result to here .
Hi There,
May I just call you Al? MrAl seems so bloody formal.
Yes, that reconfiguration would work fine methinks. But would it not be simpler to just carefully twist the legs of the TO-220 to fit in the proper locations and reverse the polarity of D3? That is what I would do to get it corrected the same way (got practice with that) without cutting traces and placing a long jumper. But maybe that is the hard way to use the existing board. Ya just really don't know until an issue like that winds up on your own bench.
but there something when i poweroff the output don't down to zero immediately but it take sometime nearly 10 secs , is that normal???