Arduino Forum

Using Arduino => General Electronics => Topic started by: larryd on Dec 26, 2016, 09:55 am

Title: Bench power supply suggestions
Post by: larryd on Dec 26, 2016, 09:55 am
I plan on engraving panels for a bench power supply.
Any suggestions on other things to add or change welcomed.

The DB09 connector will have the +-12, 0V and +-5V outputs.

(http://forum.arduino.cc/index.php?action=dlattach;topic=444118.0;attach=192180)


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Title: Re: Bench power supply suggestions
Post by: ElCaron on Dec 26, 2016, 06:47 pm
Stupid question: Will this be metal? Are the banana connectors isolated against the plate?
Title: Re: Bench power supply suggestions
Post by: larryd on Dec 26, 2016, 06:55 pm
The front and back panels will be made from .064" acrylic plastic.
The banana jacks are plastic, similar to these:
(http://img.banggood.com/thumb/view/upload/2014/11/SKU173357%20(1).jpg)

The USB jack is this one:
(https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcQK-E7BlcmFspPgFZFuHjN1hfRuubNwx-IA7uttAf2Ydt13VPGXHQ)

Edit the AC outlet is this:
(http://bentronics.com/images/70/PL164.jpg)

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Title: Re: Bench power supply suggestions
Post by: Boardburner2 on Dec 26, 2016, 07:37 pm
The front and back panels will be made from .064" acrylic plastic.
.
Is that for legend or mounting ?

Problem i used to find was with odd shaped holes, D types etc , lots of filing or expensive punching operations were needed.

Laser cut acrylic with etching works well and not too dear these days.

Title: Re: Bench power supply suggestions
Post by: larryd on Dec 26, 2016, 07:49 pm
I will be using carbide D bits, 10 degree angle, cutting with CNC tool :

(http://thumbs.ebaystatic.com/images/g/LAEAAOSw9NxTwRVO/s-l225.jpg)

This is close to final version, .064" thick, material is black cut white lettering.

(http://forum.arduino.cc/index.php?action=dlattach;topic=444118.0;attach=192265)

Blue is cut out.
Red is labeling.
White is hidden behind or the front outline of the part.


(http://forum.arduino.cc/index.php?action=dlattach;topic=444118.0;attach=192267)

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Title: Re: Bench power supply suggestions
Post by: borland on Dec 26, 2016, 08:05 pm
But no 3.3V DC supply?

I was looking at bench power supplies on eBay, and see 0-30VDC, 5A ones from China for less than $40 USD shipped. These have adjustable constant voltage/constant current modes, and over-current protection.

If you want to build a adjustable bench supply, there are XL4015 adjustable buck converters with output adjustable voltage and current (CV/CC), up to 5A output for about $4 USD shipped.  These are usually advertised as a "Lithium Charger 5A Step Down Power Supply Module", but not a very good idea to use them for that since they don't actually shut off when battery is fully charged, so that could cause battery degradation if left unattended.

For about another $7 USD, you can add a DC watt meter (volts, current, power), commonly used by RC hobby with 4-digit current/voltage resolution.  Use those with one of the brick AC adapters from a laptop (20VDC, 4.5A).
Title: Re: Bench power supply suggestions
Post by: larryd on Dec 26, 2016, 08:36 pm
Yes, 3.3v would make this ideal, the open frame supply shown in the opening post has +-12 and +-5v.



I got one of these for$140, a good value.  2X 0-30v 3amps and 5v 3amps, CV CC.
Series and parallel mode giving 0-60v 3amps or 0-30 6amps.

(http://www.mpja.com/images/9623.jpg)


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Title: Re: Bench power supply suggestions
Post by: larryd on Dec 26, 2016, 10:44 pm
@borland

Thank you, added 3.3V, I will use a buck converter 5 to 3.3V converter.

(http://forum.arduino.cc/index.php?action=dlattach;topic=444118.0;attach=192283)

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Title: Re: Bench power supply suggestions
Post by: tinman13kup on Dec 27, 2016, 01:02 am
Looks like you are running out of room. You seem to have all the major things covered...+/-12V, +/-5V, 3.3, outlet to plug in coffee pot, ...

Is this going to be a remote panel? That's something I could get into.

I'm always looking for ways to open up more room to work with and cable control. I've been playing with a ic proximity chip and will put some on/off touch buttons under black glass just as soon as I finish the circuits.
Title: Re: Bench power supply suggestions
Post by: rogertee on Dec 27, 2016, 03:21 am
what is missing is a variable voltage and a panel meter your going to end up building another for 0-36 volts but if you plan to experiment with op amps there is +- voltages
Title: Re: Bench power supply suggestions
Post by: larryd on Dec 27, 2016, 04:52 am
I cut out the panels and installed the components.
I think it tuned out well.

(http://forum.arduino.cc/index.php?action=dlattach;topic=444118.0;attach=192296)


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Title: Re: Bench power supply suggestions
Post by: larryd on Dec 27, 2016, 04:53 am
(http://forum.arduino.cc/index.php?action=dlattach;topic=444118.0;attach=192298)

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Title: Re: Bench power supply suggestions
Post by: CrossRoads on Dec 27, 2016, 05:35 am
That turned out sharp, nice work Larry.
Title: Re: Bench power supply suggestions
Post by: larryd on Dec 27, 2016, 07:27 am
Thanks Bob.

I had four of these power supplies sitting around for 15+ years gathering dust.
Decided I need to use it or lose it.

Title: Re: Bench power supply suggestions
Post by: rpt007 on Dec 27, 2016, 09:33 am
Very nice work, Larry!
What kind of material did you use for the front and back panels?

I am planning to do something similar with a universal power supply with different voltage output plus for HV tube experiments using a 1:1 transformer ( in my country 230V/230V) to isolate from direct mains supply.

Title: Re: Bench power supply suggestions
Post by: larryd on Dec 27, 2016, 06:38 pm
Thank you rpt007.

I use "Black on Bright White Laserable Acrylic Sheet", many other color combinations are available. Comes in 1/16 and 1/8" thickness.
These are often used for name tags, signage etc.
You should be able to get this from Engraving supply shops.

Edit
I ordered some of these in several thicknesses, no coloured core though.
http://www.banggood.com/170x300mm-G10-FR4-Epoxy-Resin-Sheet-Glass-Fibre-Board-Plate-0_51_523mm-p-1111475.html?rmmds=search  (http://www.banggood.com/170x300mm-G10-FR4-Epoxy-Resin-Sheet-Glass-Fibre-Board-Plate-0_51_523mm-p-1111475.html?rmmds=search)

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Title: Re: Bench power supply suggestions
Post by: Watcher on Dec 27, 2016, 06:54 pm
Quote
I ordered some of these in several thicknesses, no coloured core though.
This might sound dead obvious to most people here but I am a bit behind when it comes to panel making.

How do you get from this   (http://www.banggood.com/170x300mm-G10-FR4-Epoxy-Resin-Sheet-Glass-Fibre-Board-Plate-0_51_523mm-p-1111475.html?rmmds=search) to the picture of post #10 ??

:)
Title: Re: Bench power supply suggestions
Post by: larryd on Dec 27, 2016, 08:20 pm
That material has no color core so then text will be matt black.
As mentioned, there are acrylic sheets available with a color core.

(http://forum.arduino.cc/index.php?action=dlattach;topic=444118.0;attach=192372)

Here are similar panels:
(http://forum.arduino.cc/index.php?action=dlattach;topic=360675.0;attach=144750)

You design the layout with programs like Sketchup or AutoCAD.
Print the 1:1 layout on paper, confirm spacing with actual components.

With a hobby CNC machine, use bits as seen in post #4, import the drawing file to the CAM program then cut the panel.
I use BLUE set to 64 thou and RED to 20 thou.


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Title: Re: Bench power supply suggestions
Post by: Watcher on Dec 27, 2016, 08:33 pm
Can you recommend a good hobby cnc machine?
Title: Re: Bench power supply suggestions
Post by: larryd on Dec 27, 2016, 08:51 pm
Mine is 25+ years old, maybe try Sparkfun.

Also, this might be of interest using laminated paper.

http://forum.arduino.cc/index.php?topic=219747.msg1601329#msg1601329 (http://forum.arduino.cc/index.php?topic=219747.msg1601329#msg1601329)



See attached PDF for using Sketchup.


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Title: Re: Bench power supply suggestions
Post by: tinman13kup on Dec 28, 2016, 01:25 am
Ok, I get the front and back panels, but what about the outer casing?
Title: Re: Bench power supply suggestions
Post by: Boardburner2 on Dec 28, 2016, 01:47 am
I had four of these power supplies sitting around for 15+ years gathering dust.

I had similar for many years., unused.

On power up the some of the output caps blew.

How was it for you. ?
Title: Re: Bench power supply suggestions
Post by: larryd on Dec 28, 2016, 02:48 am
The case is 'Hammond 1598GGY' - 250x160x75mm

(http://i.imgur.com/Obo1SfH.jpg)

Hammond makes lots of different styles.
https://www.google.ca/search?q=hammond+instrument+cases&rlz=1C9BKJA_enCA713CA713&hl=en-US&prmd=isvn&tbm=isch&tbo=u&source=univ&fir=H8fOhCaHOHjOvM%253A%252C3EFMdCzj8r1PaM%252C_%253BZ0-8-WlKVuTlGM%253A%252C_JwrX16XVlbeAM%252C_%253BsUw1kNuhbJQy6M%253A%252CPYmHNlZOZo2LfM%252C_%253BYWxRB8Y0nkdpGM%253A%252C5UF4T6G7QMZ9cM%252C_%253BDB04LJYbYrfBnM%253A%252CZSPCEF9cOP_BkM%252C_%253B-2krGIWwN6pjaM%253A%252Cq-ksyaOqoiWHrM%252C_%253B6XNi_eZqp3jLnM%253A%252CUJbLY_0rcwMU3M%252C_%253BXfvfj0dXgnlGWM%253A%252CVoeiPOREByMW3M%252C_%253Bg27PVisI3-S51M%253A%252C3EFMdCzj8r1PaM%252C_%253B_zw0lWL_a-XDsM%253A%252Cq-ksyaOqoiWHrM%252C_&usg=__dygmUTvjgQOvcnY-jpKYJbxIICg%3D&sa=X&ved=0ahUKEwisrsrt4ZXRAhVQ72MKHToUD4QQsAQIJA&biw=1024&bih=748  (https://www.google.ca/search?q=hammond+instrument+cases&rlz=1C9BKJA_enCA713CA713&hl=en-US&prmd=isvn&tbm=isch&tbo=u&source=univ&fir=H8fOhCaHOHjOvM%253A%252C3EFMdCzj8r1PaM%252C_%253BZ0-8-WlKVuTlGM%253A%252C_JwrX16XVlbeAM%252C_%253BsUw1kNuhbJQy6M%253A%252CPYmHNlZOZo2LfM%252C_%253BYWxRB8Y0nkdpGM%253A%252C5UF4T6G7QMZ9cM%252C_%253BDB04LJYbYrfBnM%253A%252CZSPCEF9cOP_BkM%252C_%253B-2krGIWwN6pjaM%253A%252Cq-ksyaOqoiWHrM%252C_%253B6XNi_eZqp3jLnM%253A%252CUJbLY_0rcwMU3M%252C_%253BXfvfj0dXgnlGWM%253A%252CVoeiPOREByMW3M%252C_%253Bg27PVisI3-S51M%253A%252C3EFMdCzj8r1PaM%252C_%253B_zw0lWL_a-XDsM%253A%252Cq-ksyaOqoiWHrM%252C_&usg=__dygmUTvjgQOvcnY-jpKYJbxIICg%3D&sa=X&ved=0ahUKEwisrsrt4ZXRAhVQ72MKHToUD4QQsAQIJA&biw=1024&bih=748)


All four power supplies work :) .
Not sure for how long. :(


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Title: Re: Bench power supply suggestions
Post by: TKall on Dec 28, 2016, 06:04 am
Wow, that's nice work LarryD.  Thnks for the info, I had no idea how these items were made.  I looked at the Sparkfun cnc machine and it seems to be a pretty good deal for a beginner.  Is there anything you would suggest before I pull the trigger on this one?  https://www.sparkfun.com/products/13882 (https://www.sparkfun.com/products/13882)
Title: Re: Bench power supply suggestions
Post by: TKall on Dec 28, 2016, 06:21 am
This one has a 33" x 33" cutting area:  https://shop.carbide3d.com/collections/machines/products/shapeoko-xl-kit?variant=15826339398 (https://shop.carbide3d.com/collections/machines/products/shapeoko-xl-kit?variant=15826339398)
Title: Re: Bench power supply suggestions
Post by: larryd on Dec 28, 2016, 06:39 am
What's nice is you can cut out any shape you can draw. :)

The software to control the machine is very important.
My CAMtool control software is poor, but it does accept files created in AutoCAD and SketchUp so that makes up for things.

As with any purchase look at several different offerings before you settle one one.
Before you buy, take a look on YouTube for examples what others are doing.

I think there are CNC forums out there.

Hints:
When cutting, with the tool, X Y and Z speed must be matched to the material you are working on, i.e. wood, acrylic, fiber glass composite, aluminum, ABS etc.
Also, the speed of the rotary cutting tool and bit type is very important.

I have not gotten into laser cutting yet, maybe some day.

Things can get dusty/messy. ;)
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Title: Re: Bench power supply suggestions
Post by: larryd on Dec 28, 2016, 06:43 am
The bed size is important, mine is 22"X22".
Most things I work on are within 16X16"

Edit:
With a little imagination you can come up with interesting designs.

(http://forum.arduino.cc/index.php?action=dlattach;topic=444118.0;attach=192410)

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Title: Re: Bench power supply suggestions
Post by: TKall on Dec 28, 2016, 06:57 am
I have AutoCAD 2015, is it not standard for cnc machines to accept AutoCAD files?
Title: Re: Bench power supply suggestions
Post by: larryd on Dec 28, 2016, 07:05 am
I am not sure what is standard for CNC machines, I just know what my machine takes.

I got AutoCad 2016/17 before they went to the yearly subscription version.

I plot the drawing to a .plt file and the CAMtool software works on that.

Title: Re: Bench power supply suggestions
Post by: TKall on Dec 28, 2016, 07:12 am
I was thinking that there has always been a lot to know but knowledge has never been as accessible as it is now.
Title: Re: Bench power supply suggestions
Post by: larryd on Dec 28, 2016, 07:25 am
I was thinking that there has always been a lot to know but knowledge has never been as accessible as it is now.
I was thinking that there should be a way to remember the knowledge. :(

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Title: Re: Bench power supply suggestions
Post by: rpt007 on Dec 28, 2016, 12:07 pm
Quote
I have AutoCAD 2015, is it not standard for cnc machines to accept AutoCAD files?
AutoCAD is just doing one single step in the production chain for CNC'ing something.

CNC machines are driven by G-Code via controllers which transfer the G-Code commands into DIR/STEP commands of the related axis (stepper motors).

The normal process to get from an idea to G-Code is:
1. Your idea or a ready design (e.g. a picture)
2. A CAD program to get your idea/design vectorized (this could be AutoCAD)
3. A CAM program to transfer the vectors into machinable code (G-Code) using the suitable tools
4. A controller (Arduino can be used for that, easiest: GRBL firmware and a G-Code sender) to translate the G-Code to machine movements per axis

I am using a professional software package (Vectric V-Carve Pro) which incorporates steps 2. and 3. and vsualizes the end product before it gets into real production -> this avoids faulty productions. But there are also cheaper software packages available with almost the same features (besides of the preview function) to start with. For step 4 I am using currently Mach3; for my new little laser CNC machine (under construction) I am planning with Arduino and GRBL firmware.

Step 3 is very essential as you have to decide:
- what tool (engraving bit (what size and angle?), (router bit to cut (what size, what shape, etc.) depending on your goal(s) and the related material, cutting depth ..
- what speed (depending on tool and material)
- sequence of production (cut out as first step is not a good idea ..)

In general: you need a good "mechanic working understanding" to get good results - if not a lot of bits will be broken, a lot of workpieces will end up in the bin.
Title: Re: Bench power supply suggestions
Post by: ucd18 on Dec 29, 2016, 04:22 am
Instead of spend your money, you can used a power supply from old, unused computer. I made one some years ago. It's really convenient and stable. You have the +12V, +5, +3.3 and -5V, -12V as well. And you are able to add a multimeter  and adjustable voltage to it. Just want to share with you.

(https://c4.staticflickr.com/1/735/21665296811_dbad9cfca2_k.jpg)
Title: Re: Bench power supply suggestions
Post by: larryd on Dec 29, 2016, 06:54 am
Yes those work nicely.
I have 7 of those, recycled, to be used for future projects.

Need more time, need more projects ;)


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Title: Re: Bench power supply suggestions
Post by: xl97 on Dec 29, 2016, 09:57 pm
Nice job!

I have a laser cutter.. and do similar projects  (already have a bench top PS though)

I have been looking to get my feet wet with a CNC router as well... 

Like the Shapeoko's or similar.

You can engrave on metal with your machine....yes?  (one of the missing features of C02 hobby lasers!) 
Title: Re: Bench power supply suggestions
Post by: larryd on Dec 29, 2016, 10:24 pm
Quote
I have a laser cutter . . .
You will have to start up a business then ;)

I can/have engraved aluminum on several occasions.
Slow but sure wins the race, carbide bits only.
I don't like aluminum though.

I have also done diamond drag on brass.

I stick to: PCB, ABS, Acrylic and wood materials.

Carbon fiber is expensive.

Finally a birthday present for my wife:

(http://forum.arduino.cc/index.php?action=dlattach;topic=444118.0;attach=192622)
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Title: Re: Bench power supply suggestions
Post by: xl97 on Dec 30, 2016, 01:32 am
couple things:   ;)

* "You will have to start up a business then"

- haha.. I 'work (for somebody else) for a living'  :)   It definitely doesn't get used as much as it should!..  (but its also just a hobby laser 20x12 cutting envelope/40 watt tube)

I should try and use it to make solder masks/stencils with some day..  (*I have such good results using my vinyl plotter that I have never had the need to play with it)


I think the router did a good job!



* "Finally a birthday present for my wife:"
- If Mrs. 'D' really would enjoy that power supply..   you are a lucky man my friend!  haha..  My wife would have no clue what one is... much less how to use one.  And definitely thinks my hobby stuff is 'junk'..  LOL.




Title: Re: Bench power supply suggestions
Post by: larryd on Dec 30, 2016, 01:36 am
Mrs. D won't have a use for it so she'll have to pass it on to me ;)

"And definitely thinks my hobby stuff is 'junk'.."

Here too :(

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Title: Re: Bench power supply suggestions
Post by: Boardburner2 on Dec 30, 2016, 01:13 pm
Finally a birthday present for my wife:


Mrs bored has a birthday next month.
Been wondering what to buy , You have given me an idea.  :)
Title: Re: Bench power supply suggestions
Post by: larryd on Dec 31, 2016, 02:06 am
Mrs bored has a birthday next month.
Been wondering what to buy , You have given me an idea.  :)
Maybe we will get a new dress, high heels and a new purse for our birthdays. ;)



Cables made, waiting for banana plugs from eBay.  Project finished:
(http://forum.arduino.cc/index.php?action=dlattach;topic=444118.0;attach=192798)

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Title: Re: Bench power supply suggestions
Post by: Watcher on Dec 31, 2016, 08:50 am
Well done Larry..Looks real good.

What kind of overcurrent protection did you use on outputs?

oh... and whats the db9 output used for?
Title: Re: Bench power supply suggestions
Post by: larryd on Dec 31, 2016, 09:22 am
The power supply has short circuit shut down built in, haven't tested them as of yet  :smiley-confuse:

Eight pins on the DB09 mirror the 8 jacks seen below the DB09 connector.
i.e. pin 1 is +5V, pin 2 is 3.3V, pin 3 is GND etc.
Therefore you can plug the 8 pin header onto a breadboard (using the gender changer) to get all supplies terminated all at once.

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Title: Re: Bench power supply suggestions
Post by: Watcher on Dec 31, 2016, 03:04 pm
Quote
The power supply has short circuit shut down built in, haven't tested them as of yet [ /quote]

Thats good to protect the power supply itself but dont you need to also limit the current for your test circuit to prevent damage in case of mistakes etc?
Title: Re: Bench power supply suggestions
Post by: TKall on Jan 01, 2017, 12:56 am
After some reading and comparing I decided to go with this machine:  https://shop.carbide3d.com/collections/machines/products/shapeoko-xl-kit?variant=29273233798 (https://shop.carbide3d.com/collections/machines/products/shapeoko-xl-kit?variant=29273233798)
Just what I need, more confusion.  If only I hadn't read this thread by LarryD.
Title: Re: Bench power supply suggestions
Post by: larryd on Jan 01, 2017, 05:10 am
When I decide to get a major item I always: do pros and cons, look at multiple options, then wait a month or two before I bite the proverbial bullet.

I must admit it is one of the best tools I have bought, lots of fun.
I recommend you get two routers, one for a spare or to quickley change bit profiles.
Oh, and get a shop vacuum. ;)

You can: route one time PCBs, make signs, make front panels, CNC drilling, make wood working items.
There are quite a few YouTube videos.

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Title: Re: Bench power supply suggestions
Post by: TomGeorge on Jan 01, 2017, 02:06 pm
Hi,
Most power supplies have either the banana plug sockets or screw posts, one the plug can pull out, the other a pain to use if in a hurry and hole in post is out of site due to fingers in the way.
(http://au.rs-online.com/largeimages/F0738402-01.jpg)
Solution, spring loaded terminals;
(http://au.rs-online.com/largeimages/F0434368-01.jpg)

Tom.... :)
Title: Re: Bench power supply suggestions
Post by: Boardburner2 on Jan 01, 2017, 08:07 pm
+1 for spring loaded terminals.

I found that the lever type used for speaker terminals were more convinient than the plunger type to use.
Title: Re: Bench power supply suggestions
Post by: larryd on Jan 02, 2017, 07:06 am
FYI
I use these containers for storing leads etc.

http://www.ebay.ca/itm/321985115125?ul_noapp=true (http://www.ebay.ca/itm/321985115125?ul_noapp=true)



.(http://forum.arduino.cc/index.php?action=dlattach;topic=444118.0;attach=193039)
Title: Re: Bench power supply suggestions
Post by: Watcher on Jan 02, 2017, 10:46 am
I use something like this for storing leads and small things


(https://forum.arduino.cc/index.php?action=dlattach;topic=444118.0;attach=193052)
Title: Re: Bench power supply suggestions
Post by: Boardburner2 on Jan 02, 2017, 05:13 pm
FYI
I use these containers for storing leads etc.

Santa pushed the boat out this year  :)

[/url](https://forum.arduino.cc/index.php?action=dlattach;topic=444118.0;attach=193096)
Title: Re: Bench power supply suggestions
Post by: Boardburner2 on Jan 20, 2017, 10:43 pm
Maybe we will get a new dress, high heels and a new purse for our birthdays. ;)
.
It was a Lois Viton handbag.  >:(
So hoping it was a knockoff.
Title: Re: Bench power supply suggestions
Post by: MAS3 on Jan 21, 2017, 01:16 am
Well if it was a Lois Viton, then it was indeed a knockoff of a Louis Vuitton.



:P
Sorry, couldn't let that one go.