Gandledorf
New Member
One of the great things about working in a lab as a student was the equipment available, oscilloscopes, function generators, variable PSU's, all kinds of goodies, which I can't afford personally now that I am out because of their costs.
I've decided to try and build some myself, at least for the ones that aren't to terribly complex, (I'm imagining I'll just try and learn to do without an oscilloscope), and I decided to start with a PSU.
I have a 12V @ 500mA power supply "brick" coming in soon, and my idea was to build a variable power supply out of it, providing from 1.25 - X volts, where X is at least 9V (I'd like it to be larger, but I'm not sure what I can get out of an LM317 with a 12V PSU). Is my schematic here correct? How can I figure out how much voltage I will get out of the LM317 (trial and error I suppose? It isn't on the data sheets)
**broken link removed**
EDIT: The pot is about 2k, due to the equation for Vout being 1.25(1 + R2/R1) + Iadj
I've decided to try and build some myself, at least for the ones that aren't to terribly complex, (I'm imagining I'll just try and learn to do without an oscilloscope), and I decided to start with a PSU.
I have a 12V @ 500mA power supply "brick" coming in soon, and my idea was to build a variable power supply out of it, providing from 1.25 - X volts, where X is at least 9V (I'd like it to be larger, but I'm not sure what I can get out of an LM317 with a 12V PSU). Is my schematic here correct? How can I figure out how much voltage I will get out of the LM317 (trial and error I suppose? It isn't on the data sheets)
**broken link removed**
EDIT: The pot is about 2k, due to the equation for Vout being 1.25(1 + R2/R1) + Iadj