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Show your favorite and most used benchtop PSU
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Pawelr98:
This is mine.

0-30V 0-6A

Uses uA723 with extra electronics.
Negative 2.5V rail (431 stabilized), allows to go down to 0V
extra overcurrent protection on driver stage
separate 35V supply for the chip that ensures dropout of no more than the Vcesat of power transistors
14V/28V transformer tap automatic switching, 300VA toroid transformer

The output stage is 2xTungsram 2N3055 on an outside radiator.

Case is metal.

On the right there's a tube tester.
Sometimes it also works as a low-current high-ish voltage PSU as it has a primitive 0-100V adjustable voltage source.
Just a 2N60 beeing source follower, no proper regulation.
mariush:

--- Quote from: jaycee on May 13, 2020, 07:10:30 pm ---Not the first PSU I've built, but the first one that was more than an LM317, and built into a proper box :)


--- End quote ---

It looks nice. It could be improved quite a bit though, if you want to release the project at some point.

Fuse is in kind of a bad location, hard to shove your fingers in a corner to pull the fuse up.  Maybe should be on bottom left corner under that to-220 with heatsink.
Maybe add connectors for those soldered wires on the left side of pcb.
Plenty of room to lay the four diodes properly .... maybe consider also dual footprint , for regular bridge rectifier (the ones very common used in atx power supplies , gbj , gbu etc, they can be screwed to heatsinks)

Could maybe rotate the to-220 chips and align with that to-220 with heatsink and maybe even with the bridge rectifier, so that a wide heatsink could sink all those chips. Also give them rigidity and whatever.  May have to add insulators.

I'd rotate most through hole resistors 90 degrees , have most traces on top vertical and the ones on bottom horizontal ,  with ground fills or whatever for increased trace thickness.

The DISPLAY connector could probably be on the right corner/edge of the board instead of center, as the ribbon cable could block air flow going through case.

As for parts minimization, you could maybe add footprints for replacing those 47k resistors with 2 x 100k in parallel to get 50k resistors - close enough to 100k.

Not a fan of to-92 transistors, i'd rather make a board surface mount than use those.
25 CPS:
My most frequently used bench power supply is a Canadian Research Institute TRP 20/4.   As the model number implies, it’s a 20 V, 4 A capable supply with coarse and fine adjustments and two ranges.  The range switch is a gotcha though with a centre off position and the two ranges being 0-10 V and then 10-20 V.  It isn’t possible to ease the voltage up across the whole 0-20 V range without having a really awkward changeover in the middle.





Unfortunately, as is the case with a lot of the long gone Canadian test equipment manufacturers, there’s hardly any information or documentation online and I don’t have manuals or diagrams for this machine.
old-jo:
This is my favorite and most used benchtop PSU:



I made it after watching Build your own Variable Lab Bench Power Supply video by GreatScott!
I used the same LTC3780 module as the video. As input for the LTC3780 module, I used an old laptop charger.

Good enough for a hobbyist.
AJ3G:
Just completed this supply using the RIDEN 6018W. Need to finish up the final wiring around the binding posts, and installation of a fan controller, and I should be ready for prime time.

Rich
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