Electronics > Beginners

Benchtop Power Supply

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TorqueRanger:

--- Quote from: T4P on November 05, 2012, 04:29:12 pm ---The issue with getting 19V down to let's say at 12V @ 3A can be quite a task to dissipate in a "compact" form factor when using linear
But i got a good one for ya
http://www.ebay.com/itm/ZXY6005-DC-DC-power-module-60V-DC-CCCV-stabilized-voltage-supply-High-Voltage-/180819803054
http://dx.com/p/zxy6005-2-6-dc-dc-60v-constant-voltage-current-regulated-power-supply-module-green-151115
Also remember, this is a step-down which means you can get less than about 18V from a 19V laptop power pack

--- End quote ---
How hard would to be to get a schematic for that circuit because I would have to figure how to mount that some kind of box???
My idea was to move the leds,screen display,and buttons to the front panel but how would I control the voltage and current from those tiny pots with being  a pain to do ??

firewalker:

--- Quote from: TorqueRanger on November 06, 2012, 01:31:54 am ---Anyone one every built one of these and has pics ???
http://tuxgraphics.org/electronics/201005/bench-power-supply-v3.shtml


--- End quote ---

I did. Years ago. It was the plain R-2R version. I think a user here had build the new version (R-2R+PWM).

It's a nice design to demonstrate what an mcu can do (it combines I/O, DACs, ADCs, general transistor calculations e.t.c. A really nice exercise for beginners, with clean understandable code in C), but not suitable for a lab or any serious work.

Edit:

I thought I had dismantle it, but no. It was sitting in a box. It still works.


Alexander.

TorqueRanger:
Well I got to the point to where size doesn't matter ... So does anyone know who makes a kit or really good schematic for a bench top power supply????

IanB:

--- Quote from: TorqueRanger on November 10, 2012, 01:58:49 am ---Well I got to the point to where size doesn't matter ... So does anyone know who makes a kit or really good schematic for a bench top power supply????

--- End quote ---

This subject has been discussed to exhaustion around here, and the answer is always that you can buy one far cheaper than you can make one. A power supply is a tool, and for most people you buy the tools you need so you can concentrate on the interesting things you can make with those tools. Making a laboratory power supply is a bit like making a hammer or making a saw. OK, you can do it, but for most purposes what is the point?

Isamun:

--- Quote from: TorqueRanger on November 06, 2012, 01:31:54 am ---Anyone one every built one of these and has pics ???
http://tuxgraphics.org/electronics/201005/bench-power-supply-v3.shtml


--- End quote ---

I buildt one of these as my first kit a few months back. Only issue i ran into was getting the code to compile; I had to change some of the keywords..
I can send you my code if you want to give it a try.

Another downside is the price. The kit + Atmega8A + LCD + programmer = approx 100$. And on top of that you need a DC source.

I used a beefy 7A 19.5V laptop brick (edit)  wich gave me 18.2V max output.

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