hello! kind of a simple question i hope. diy adj. supply. featuring an lm317. with no load. voltage drops about 2 volts as inticipated. adjusts from 0 to whatever no problem. with a small dc motor. total dropout. with an led. reading little over 2 volts. unplug the led. right back to 12. i understand this supply has only the ability to adjust the voltage and not the current. however. i would think that an led should not be able to drop it down to over 2 volts. would think i could run a dc motor. idk. i supplied the lm317 with several sources. transformer ---> full wave bridge rectifier ---> lm317 and several manufactured power supplies to the lm317 of varying voltages. they all perform the same looks great with no load. even an led seems to draw them down... thanks in advance!
http://images.elektroda.net/56_1346052196.gif
im following this diagram.
http://images.elektroda.net/56_1346052196.gif
im following this diagram.