Electronics > Projects, Designs, and Technical Stuff
I want to built a Power Supply
phil:
--- Quote from: Alexandros81 on January 29, 2014, 01:51:28 pm ---I was watching Dave's videos on Lab Power Supply Design. Probably am gonna try and built something similar.
--- End quote ---
Do you have a scope? That would make things a lot easier. One of the big problems with linear supplies is that they tend to oscillate. The best way to find out about that is to use a scope. Especially discrete opamp designs have that problem, but it can also happen with a LM317 or similar ICs.
Don't expect to get a fully working PSU with all the features you wanted with your first try. Start with a small project to learn about the quirks of these circuits.
As with any other medium/high power devices: Layout matters! You can break even the best circuit with a bad layout. Switch mode supplys suffer even more from bad layouts than linear ones do. Read Dave's PCB guide to get a feel for what you need.
Phil
Alexandros81:
--- Quote ---Do you have a scope? That would make things a lot easier. One of the big problems with linear supplies is that they tend to oscillate. The best way to find out about that is to use a scope. Especially discrete opamp designs have that problem, but it can also happen with a LM317 or similar ICs.
Don't expect to get a fully working PSU with all the features you wanted with your first try. Start with a small project to learn about the quirks of these circuits.
As with any other medium/high power devices: Layout matters! You can break even the best circuit with a bad layout. Switch mode supplys suffer even more from bad layouts than linear ones do. Read Dave's PCB guide to get a feel for what you need.
Phil
--- End quote ---
Thanks Phil. I'll check Dave's PCB guide. I don't yet have a scope.
I have found a lot of free books in http://lib.freescienceengineering.org
Alex
Alexandros81:
Where do I find Dave's PCB Guide?
thanks
Alexandros81:
--- Quote from: phil on January 28, 2014, 06:16:20 pm ---To be honest, it sounds like you want too much at once. Why not begin with a PSU on a smaller scale with a single channel to learn how it works? There are many pitfalls to PSU design. And you can avoid most of them in your final design if you work your way up from a very basic one (opamp, transistor) to the more advanced ones.
Why not take a plug pack with 12V out and try to get a circuit to regulate from 0-10V with 0-1A current limit? Trust me, even that will be a challenge, especially if you want to do it right.
Doing it right means "stable under all possible loads", meaning BIG capacitive loads, inductive loads and dynamic loads. Expanding to MCU control, 30V/3A, dual tracking won't be very hard after that.
Phil
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Hi Phil.
The plug pack will have a 12V out. What would be the current output of the plug pack?
thanks
ggchab:
You might find some ideas in this thread :)
https://www.eevblog.com/forum/beginners/lm324-power-supply-with-variable-voltage-and-current/msg2253243/#msg2253243
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