Simple Linear Adjustable Power Supply Tutorial (Based Around LM317) Part 2/2

How to build your own linear adjustable power supply based on LM317.
In this tutorial I'll explain how linear power supply works, what parts it consists and a lot of small details, like how to calculate smoothing capacitor value, or how to choose a transformer. Plus you'll see how to build an actual power supply.




ADDITIONAL INFO & PHOTOS: http://jumperone.com/2011/08/lm317-adjustable-psu/

And you can find some more cool stuff on http://www.jumperone.com/
Twitter: http://twitter.com/JumperOnePhil


Videos from other people on similar topics:

http://www.youtube.com/watch?v=8ruFVmxf0zs - Electronics Thermal Heatsink Design Tutorial from Dave Jones
http://www.youtube.com/watch?v=cyhzpFqXwdA - Diode Tutorial & How to build an AC to DC power supply from Afrotechmods
http://www.youtube.com/watch?v=GMePE7NZcxw - Electrical Transformer Tutorial from Afrotechmods




...bonus: http://youtu.be/4I_w7kZAcp0


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Science & Technology

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[vze4p6c2]

you could have used an isolation transformer. No?

[JumperOneTV]

@vze4p6c2 I don't follow you there. What for?

[vze4p6c2]

@JumperOneTV i mean, instead of creating a separate power supply for the voltage metering module.

[JumperOneTV]

@vze4p6c2 I could've used isolation DC-DC converter module, or capacitor-based isolation. But using an isolation transformer would be virtually the same - you still need to put rectifiers and voltage regulator, because unregulated isolation output could vary a lot. I guess, the best way is to use a capacitor-based isolation (oscillator based on 74 series logic two capacitors and rectifier).

[Jprojects1]

This is a dumb question, but what software did you use to make your front panel cutting template?

Great video too.

[JumperOneTV]

@Jprojects1 why dumb? Not at all! I've used Inkscape (inkscape dot org) free opensource vector graphics editor.

[EricPiGuy]

Fantastic video! You explain everything very clearly. Love how cleanly the assembly turned out. Thanks for the great vid!

[kerimil]

nice vid - thx

[MrSriiki]

pretty good

[DarkLevis]

better than studying in university, awesome stuff