Ok. I'm new here. I want to build a Variable input, adjustable power supply. I have some of the basics figured out, but the wiring and some other parts I'm not sure of. I have a project box, an input jack, an LM317 (for variable input of 12vdc to 30vdc), a potentiometer (volume control type with "click" off. If that shuts off the output voltage, great!), and a 12v digital display. I know I have to have another 12v regulator for the power side of the digital display, and the signal wire off the display would connect to the positive lead of the output coming from the box, but other than that, I have no idea how this thing will have to be wired. I have seen some diagrams online, but they show resistors, capacitors and whatnot. I wish I knew more about how the 317 and the pot works. does the pot control the signal lead of the 317? If so, isn't that all I need? What would I need the caps and resistors for? I'm fine with using them, just need more info.
Bottom line. I need an adjustable (0 to 30v output) power supply that I can use any DC transformer from 12v to 30v as an input. The digital gauge is for the output voltage.
I need a Parts list and a diagram. ANY help would be appreciated. THANKS!
Bottom line. I need an adjustable (0 to 30v output) power supply that I can use any DC transformer from 12v to 30v as an input. The digital gauge is for the output voltage.
I need a Parts list and a diagram. ANY help would be appreciated. THANKS!
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