Electronics > Beginners
Benchtop Power Supply
TorqueRanger:
Whats your thoughts on this Power supply ???
http://jumperone.com/2011/08/lm317-adjustable-psu/
My main concern with this design is ,
No short circuit indicator
No short circuit protection
I am not sure about anything else so I asking you guys and how hard would it be to add this features to this design ?????
mariush:
It's like the title says, a basic linear "power supply".
The author never intended to be more than that.
If you want something better, you go with better regulators that have built in short circuit protection like LM2941 , or even regulators that have a flag pin which goes high on low input voltage, output current limit, over temperature shutdown etc like MIC29303 (picture doesn't match on digikey) / MIC29503
That LM317 is a "jellybean" chip, good but old, requiring a few volts about the output voltage just to regulate properly, there are better solutions for doing a simple linear psu.
diogoc:
If anyone is interested here is almost the schematic of the chinese ZXY6005S power supply.
https://drive.google.com/file/d/0BzkDuDi_KxbsVGRiZ0lfYjkxaHM/edit?usp=sharing
hansaya:
Hey guys
I made a bench top power supply using these modules, Pictures :http://imgur.com/a/H5vB1
Only difference is I ended up changing main buck regulator from XL7005E to XL7005A. XL7005A (http://www.xlsemi.com/datasheet/XL7005A%20datasheet-English.pdf) can handle the voltage up to 80v so it wont blow up if you go over 65v(if you wanted use the unit up to 62v). Other thing is its an good idea to change all the capacitors to a good brand and maybe higher rated caps.
I wanted to Thank you diogoc for sharing the schematic, it was pretty useful when I accidentally burned few things on the board :).
csmithdoteu:
A couple of options...
Firstly, you could just buy a cheap bench supply. Any generic HY1803D fits the bill for such things and you couldn't build one for twice the price.
Secondly, I suffer from the same problems as yourself with respect to working area. Mine is the dining table instead. I tend to not need anything greater than 12v so I settled on using a 12v 7Ah sealed lead acid deep cycle battery as a power supply. This is trickle charged with a wall wart. Cheap, reliable, nice clean DC out.
If I need anything less, I'll integrate a linear regulator into the design or use a simple ugly LM317 board I have. I make no apologies for this one - it's ugly but it works reliably and has done for a long time. Has 4mm panel sockets soldered to the board for test leads:
Safety note: SLA batteries can deliver a lot of current. Mine is fused at 3A quick blow and I tend to use a 10-100 ohm resistor as a fuse inline with the circuit being developed as well as that will toast instead of the target if anything goes wrong.
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